Drinking Water Quality
Annual Report 2011/12
Contents
Contents ............................................................................................................................. 2
About this report ..................................................................................................................3
Common terms ....................................................................................................................4
Our commitment to you ........................................................................................................5
Introduction ........................................................................................................................ 6
Water Forever ...................................................................................................................... 8
Where does your water come from? ..................................................................................... 11
Perth Metropolitan Region............................................................................................... 11
Goldfields and Agricultural Regions .................................................................................. 14
Great Southern Region ................................................................................................... 15
South West Region ........................................................................................................ 16
North West Region ......................................................................................................... 17
Mid West Region............................................................................................................ 18
What drinking water guidelines must we meet? ...................................................................... 19
Case Studies...................................................................................................................... 24
What activities are allowed in drinking water catchments? .................................................. 24
pH and Alkalinity Correction using Calcite Pellets ............................................................... 25
Rehabilitation of Happy Valley Water Reserve, Brookton ..................................................... 28
How is your water treated? .................................................................................................. 29
Understanding water quality test results ............................................................................... 29
Performance at a glance...................................................................................................... 29
Customer Expectations ....................................................................................................... 29
Improving your water quality ............................................................................................... 29
Summary .......................................................................................................................... 29
Appendix A – List of parameters within sampling groups ......................................................... 29
Appendix B – Summary of test results .................................................................................. 29
Appendix C – List of all sampling parameters ......................................................................... 29
2 Drinking Water Quality Annual Report 2011/12
About this report
The 2011/12 Drinking Water Quality Annual Report is a review of our performance for the financial
year ending 30 June 2012.
This report is specifically designed to provide the Western Australian public with information on the
quality of their drinking water.
Publication of this report allows the Corporation to meet the requirements of the Australian
Drinking Water Guidelines, our Operating Licence requirements with the Economic Regulation
Authority, the requirements of the Memorandum of Understanding with the Department of Health
and the reporting requirements of the National Water Commission.
3 Drinking Water Quality Annual Report 2011/12
Common terms
ADWG
CMS
DOC
DoW
EDR
GAWS
GL
GSTWS
HERO
IWSS
LGSTWS
ML
MoU
MIEX
NHMRC
PCT
PDWSA
PPP
PSDP
RO
SSDP
UV
WPWSS
WSP
Australian Drinking Water Guidelines
Catchment Management Strategies
Dissolved organic carbon
Department of Water
Electrodialysis Reversal
Goldfields and Agricultural Water Supply
One gigalitre (equals one thousand million litres)
Great Southern Towns Water Supply
High Efficiency Reverse Osmosis
Perth Integrated Water Supply System
Lower Great Southern Towns Water Supply
One megalitre (equals one million litres)
Memorandum of Understanding (with Department of Health)
Magnetic Ion Exchange
National Health and Medical Research Council
Process Control Table
Public Drinking Water Source Area
Public Private Partnership
Perth Seawater Desalination Plant (Kwinana)
Reverse Osmosis (Desalination)
Southern Seawater Desalination Plant (Binningup)
Ultra-violet Disinfection
West Pilbara Water Supply Scheme
Water Safety Plan
4 Drinking Water Quality Annual Report 2011/12
Our commitment to you
We are committed to effective management of
our drinking water supplies to provide a safe,
high-quality product that consistently meets the
Australian Drinking Water Guidelines, consumer
and other regulatory requirements.
To achieve this, we will in partnership with
stakeholders and relevant agencies:
• Manage water quality from source water through
to the consumer.
• Strongly advocate source protection and primacy
of drinking water quality over other land uses.
• Use a risk-based approach to identify and manage
potential threats to water quality.
• Comply with the health-related criteria of the Australian Drinking Water Guidelines and work to
progressively improve compliance with aesthetic criteria.
• Use appropriate contingency planning and incident response capability.
• Incorporate the needs and expectations of our consumers, stakeholders, regulators and
employees.
• Routinely monitor the quality of drinking water and use effective reporting mechanisms to
provide relevant and timely information, and promote confidence in the water supply and its
management.
• Participate in research and development activities to ensure continued understanding of
drinking water quality issues and performance.
• Contribute to setting industry regulations and guidelines, and other standards relevant to public
health and the water cycle.
• Continually improve our practices by assessing performance against corporate commitments
and stakeholder expectations.
We will implement and maintain a drinking water quality management system consistent with the
Australian Drinking Water Guidelines (ADWG) to manage the risks to drinking water quality.
All managers and employees involved in the supply of drinking water are responsible for
understanding, implementing, maintaining and continuously improving the drinking water quality
management system.
5 Drinking Water Quality Annual Report 2011/12
Introduction
We provide drinking water to Perth and over 220 small communities scattered
throughout Western Australia. We are one of Australia’s largest water suppliers
delivering over 350 billion litres of high quality drinking water from 103 dams and weirs
and 94 borefields to over a million properties through 33,600 kilometres of water main.
Our health performance (chemical,
microbiological, and radiological) this year
resulted in 100 per cent of metropolitan and
country localities meeting the extremely
high standards set by the WA Department of
Health.
An extensive drinking water quality
monitoring program confirms the safety of
the water we provide to customers.
Bacterial and chemical analyses are carried
out by independent laboratories, approved
by the WA Department of Health.
We are also working to further
protect the quality of all water supply
North Dandalup Dam (Perth Integrated Water Supply
schemes by strengthening source protection
measures for our surface and groundwater catchments. While our health-related performance is
excellent, we recognise there are significant challenges ahead of us in relation to our aesthetic
performance. This is especially the case in some of our small country water supplies, where there
are limited sources of drinking water available, and where installation of treatment can come at a
very high cost.
A program to improve aesthetic quality at nine towns in the Murchison and Goldfields has delivered
water treatment facilities at Leonora (Reverse Osmosis) and Wiluna (Electro Dialysis Reversal).
The high capital cost of these treatment facilities is presenting challenges to the Corporation and its
ability to meet the original program timeframes. The Corporation has, however, committed to
delivering one aesthetic treatment solution per year as part of its upcoming five year capital
program.
Our Operating Licence currently requires us to comply with the Memorandum of Understanding
with the Department of Health. The Department expects we comply with the microbiological, health
chemical and radiological parameters specified by the National Health and Medical Research Council
in the ADWG.
One of the issues identified in our customer research is that customers need more information
about their drinking water quality. This report is the 10th annual report providing detailed
6 Drinking Water Quality Annual Report 2011/12
information on drinking water quality in an open and honest manner. We recognise that feedback
from our customers is a vital source of information to help us continuously improve our
management of drinking water quality, and we extend an open invitation for readers to respond
with their opinions and suggestions. If you require more water quality information please call 13
13 75.
7 Drinking Water Quality Annual Report 2011/12
Water Forever
In 2011, a new 10-year strategy for Perth was proposed and supported by the Minister for Water.
Titled “Water Forever-Whatever the Weather”, the strategy was launched in November 2011 and
continues our move towards a portfolio of climate independent sources. This includes:
•
Continuing the use of dams as a primary water source but becoming less dependent on them
over time.
•
Limiting metropolitan groundwater abstraction to a level agreed with the Department of Water.
This can be achieved by substituting abstraction from the superficial aquifer with water drawn
from the deeper, confined aquifers, in addition to the progressive expansion of our
groundwater replenishment plant.
•
Expanding our total peak desalination capacity to 145 billion litres per annum, when the 50
billion litre second stage of the Southern Seawater Desalination Plant is completed in mid2013.
There is also a tailored program of
work to augment supply in regional
areas. The program focuses on
customers, communities, small
businesses and towns serviced by
the Corporation.
We are also planning for water
services across the state for the
next 10 years, as we face our
principal dual challenges of climate
change and strong resourcesdriven growth, particularly in the
Pilbara region. The report “Water
Forever-Whatever the Weather”
outlines the current state of our six
regions and discusses options for
future sources to meet increasing
and competing demands for water.
Perth Seawater Desalination Plant (Kwinana)
Over the next 10 years, we will
invest an estimated $9.5 billion to ensure a high level of service and supply security for our
customers across the state. In southern areas, we are turning to climate independent sources,
such as desalination, while in the fast growing Pilbara region extensive upgrades and additions to
water services are planned.
Future planning also incorporates ongoing programs to decrease water consumption and increase
water use efficiencies among our business and residential customers. We are also committed to
increasing the use of recycled water to irrigate community parks and gardens, industrial use and to
8 Drinking Water Quality Annual Report 2011/12
replenish groundwater, subject to the outcomes of our Groundwater Replenishment Trial to be
completed at the end of 2012.
Our source development strategy is complemented by an active program of water efficiency and
demand management initiatives. These aim to reduce our total water use without compromising
our community’s lifestyle, enjoyment and economic prosperity. Also linked to this are strategies to
increase ongoing recycling initiatives with Government, industry and commercial organisations.
9 Drinking Water Quality Annual Report 2011/12
10 Drinking Water Quality Annual Report 2011/12
Where does your water
come from?
This section provides an overview of the water supplies in each of our six regions.
Perth Metropolitan Region
The Perth, South West and Goldfields and
Agricultural regions share a supply system that
draws on surface sources, groundwater and
seawater desalination. This is known as the
Integrated Water Supply System (IWSS) which
provides fresh, clean drinking water to more than
1.7 million people. Surface water comes from eight
dams in the Darling Range: South and North
Dandalup, Serpentine, Wungong, Churchman Brook,
Canning, Victoria dams and Mundaring Weir. Water
is also supplied from Stirling and Samson Dams in
the South West Region.
Groundwater sampling
Groundwater is drawn from the Yarragadee,
Leederville and shallow aquifers. Most of the 180 bores are located in Perth's northern suburbs and
pine plantations. Groundwater is treated at six groundwater treatment plants. There are also 12
independent artesian bores pumping water directly into service reservoirs.
Drought conditions have forced us to change the way the system is operated to preserve our
limited surface water supplies by maximising groundwater production. It is now possible to supply
all of Perth and Mandurah with groundwater for a limited period, if required.
In 2011/12, drinking water production for the IWSS was delivered on target and within overall
water allocation and license parameters. Total groundwater abstracted was 158.8 billion litres,
against an allocation of 159 billion litres.
The Perth Seawater Desalination Plant in Kwinana
exceeded its rated annual production capacity of 45
billion litres by delivering over 49 billion litres into the
IWSS. This is the third year in a row that this climate
independent source has achieved above average
production. This is the result of ongoing improvements
and efficiency measures at the plant. The desalinated
water enters the metropolitan scheme through
Thomsons Reservoir where it is blended with Jandakot
groundwater and Hills sources. A portion can be stored
in Canning Dam and Wungong Dam during periods of
Perth Seawater Desalination Plant intake
low demand in the winter.
pump station
The second major desalination plant at Binningup, just
north of Bunbury, commenced production ahead of schedule in September 2011.
11 Drinking Water Quality Annual Report 2011/12
In response to ever decreasing rainfall, the Corporation moved
directly to the second stage, which will see the plant capable of
producing 100 billion litres per year. The plant has set new
standards in seawater desalination including a new benchmark
for energy efficiency, and has won a string of state, national
and international industry awards. This includes being named
as Desalination Plant of the Year, at the International Global
Awards in Rome, in May 2012. The plant delivered over 30
billion litres into the IWSS during 2011/12.
Sometimes customers receive a mix of groundwater, surface
water and desalinated seawater to optimise the amount of
water available for the IWSS. The percentage of each depends
on seasonal factors. Yanchep and Two Rocks are special cases
in the Perth Region having their own independent groundwater
supplies. Eventually these will join the IWSS.
Perth Seawater Desalination Plant
reverse osmosis racks
Water supplied into the IWSS during 2011/12 consisted of 31
per cent from surface water, 46 per cent from groundwater
and 23 per cent from desalination.
The proportion of desalinated water will
increase to approximately 50 per cent when
the second stage of the Southern Seawater
Desalination Plant is completed in mid 2013.
The Mundaring Water Supply Improvement
Project includes the formation of a public
private partnership (PPP) with Helena Water,
launched in 2011/12 to fund, build and
operate the new treatment plant scheduled
for completion in mid 2013. Helena Water will
provide us with a treatment plant service for
up to 35 years, when the plant will be
handed over to the Water Corporation in full
operating condition.
Southern Seawater Desalination Plant, Binningup
The Perth Integrated Alliance was established
in 2011/12 and has taken on the operations
and maintenance of all of our metropolitan
services in partnership with Programmed
Group and the Aroona Alliance which is
Construction of the new Mundaring Water
managing our metropolitan water in
partnership with Degremont and Transfield assets. This combines private sector commerciality with
our technical expertise, to drive efficient operations and lowest possible cost.
12 Drinking Water Quality Annual Report 2011/12
13 Drinking Water Quality Annual Report 2011/12
Goldfields and Agricultural Regions
The Goldfields and Agricultural Water Supply (GAWS) provides the majority of the water to towns
in the Agricultural Region. Water is sourced from Mundaring Weir near Perth, and water supplied to
most of the towns is chloraminated with the remainder being chlorinated (for more information
please refer to page 27). Most of the localities in the Goldfields Region receive their supply from
local ground or surface water sources.
In Kalgoorlie-Boulder, a separate inlet system to Mt Percy and Mt Charlotte Tanks enables all of the
supply to be delivered via the new Binduli Reservoir resulting in a more consistent chlorine residual
to all parts of the reticulation system.
In Salmon Gums a mobile ultra-filtration plant has been installed enabling the treatment and use of
water captured in the Open No. 2 reservoir.
A number of major capital projects aimed at further improving the water quality of the GAWS have
received funding approval. The largest of these is the Mundaring Water Treatment Plant,
construction of which has commenced and is due for completion by the end of 2013. This will be a
highly sophisticated plant, which is expected to greatly improve the management of disinfection
residuals throughout the GAWS. Construction of the Cunderdin Storage Tanks will replace the old
unroofed Cunderdin Reservoir and make the supply much safer.
In July 2011, realignment of the Corporation’s regional boundaries has meant Hopetoun and
Ravensthorpe moved under the control of Goldfields and Agriculture Regions.
14 Drinking Water Quality Annual Report 2011/12
Great Southern Region
In the Great Southern Region, the schemes include the Great Southern Towns Water Supply
Scheme (GSTWS) and the Lower Great Southern Towns Water Supply Scheme (LGSTWS). Harris
Dam is the main source for the GSTWS and the South Coast borefields are the main source for the
LGSTWS. However a number of localities also have local sources which can contribute to supply if
required.
A major source protection initiative is currently being undertaken to fence local sources in the
region. This work includes new and additional fencing in Jerramungup, Ongerup, Hyden,
Newdegate, and Narrogin. New boom gates have been installed in the Angove Creek Catchment in
Albany to provide additional security to the site from unauthorised access. At Kojonup, the local
source has been isolated from the potable scheme to minimise any possible water quality risks. The
local source has been made available for irrigation of public areas and gardens.
Significant works to address water supply issues in Walpole have been undertaken with two new
groundwater bores being commissioned in early 2012. It is anticipated that the bores will be used
in summer to supplement supply during peak periods as needed. A new tank in Denmark was also
installed to assist with storage and supply of water during peak periods. An online turbidity
analyser was also installed at Bottle Creek in Narrogin for advanced notice of high turbidity events
to assist with monitoring water quality of the GSTWS.
15 Drinking Water Quality Annual Report 2011/12
South West Region
Towns in the South West Region obtain water from a number of surface and groundwater sources
that are largely independent and not connected to a major scheme. Harvey, Waroona, Hamel,
Binningup, Myalup and Yarloop are exceptions, being supplied from the Integrated Water Supply
System. Bridgetown, Hester, Boyup Brook, Greenbushes and Balingup are now connected to the
Bridgetown Regional Water Scheme, supplied from the Yaragadee Bore near Nannup via Millstream
Dam.
A new Yarragadee bore and treatment plant has been commissioned to supplement the water
supply for Margaret River. The bore has high levels of naturally occurring iron and manganese and
the newly commissioned water treatment plant has been operating successfully to ensure these
levels remain well below the ADWG aesthetic targets.The Millstream Dam in Bridgetown has been
undergoing a major capital upgrade through 2011 and 2012 and is due for completion later this
year. A direct supply from the Nannup Yaragadee bore, with a temporary filter and chemical
dosing, has ensured Bridgetown residents continued to receive good water quality.
Picton water treatment plant was commissioned this year which augmented supplies to Picton,
Australind, Eaton, Brunswick Junction and Burekup residents.
The Augusta water treatment plant has doubled in size with the installation of a second dynasand
treatment unit.
In July 2011, realignment of the Corporation’s regional boundaries has meant Walpole water
treatment plant moved under the control of Great Southern Region.
16 Drinking Water Quality Annual Report 2011/12
North West Region
The West Pilbara Water Supply Scheme (WPWSS) supplies customers in Karratha, Dampier and the
neighbouring towns of Roebourne, Wickham, Point Samson, Cape Lambert and the Burrup
Peninsula. The scheme has two sources: Harding Dam and Millstream borefield. The capacity of the
Harding Dam water treatment plant expanded with the addition of more UF membranes in early
2012.
The East Pilbara Water Supply Scheme supplies customers in Port Hedland, South Hedland,
Wedgefield Industrial Area and the local port operations. The scheme is supplied with groundwater
from the Yule and de Grey River borefields.
In the Kimberley area, the town of Kununurra is supplied by a local groundwater source. The
remaining towns in the North West Region are supplied by local independent groundwater sources,
with exception of Wyndham which is supplied by Moochalabra Dam. Additional water sources are
coming online with the expansion of the Cane River borefield in Onslow by 2013 and the Yule and
De Grey River borefield expansion for the Hedland scheme by 2014. We are working with industry
to investigate the West-Canning basin as future fit-for-purpose water source for industry in Port
Hedland. The Corporation is also working with Rio Tinto to integrate a new water source from the
Bungaroo Valley into the WPWSS. Discussions are continuing with Chevron, who will be
constructing a desalination plant as the next water source for Onslow.
The Kimberley Region is experiencing sustained growth and we are undertaking projects to
upgrade water supply schemes and infrastructure. Projects include delivering greater quantities of
water to Broome with the upgrade of a water main. Work on a second storage tank in Broome,
which will increase the storage capacity by 60 per cent by September 2012, is progressing.
17 Drinking Water Quality Annual Report 2011/12
Mid West Region
Mid West Region uses independent groundwater sources. In a region facing challenges from scarce
and brackish (highly saline) water supplies, we are working to ensure reliable access to a quality
drinking water supply.
At Gascoyne Junction a Reverse Osmosis treatment plant has been installed due to increased
salinity in the bores since the December 2010 floods. In Carnarvon, repairs are ongoing from
damage sustained during the December 2010 floods.
In the coastal borefield schemes (Horrocks, Seabird, Woodridge, Watheroo, Kolburn) optimisation
of the treatment plants occurred in 2011/12 which should result in improved aesthetic water
quality in relation to the removal of iron and manganese.
A program to improve aesthetic in nine towns in the Murchison and Goldfields has delivered water
treatment facilities at Wiluna (Electrodialysis Reversal Plant) and Yalgoo (Adsorbsia TM).
We remain committed to the delivery of aesthetic water quality improvements through this
program, however strong demand from other capital programs has significantly slowed the pace of
delivery.
18 Drinking Water Quality Annual Report 2011/12
What drinking water
guidelines must we meet?
Our Operating Licence, issued by the Economic Regulation Authority, recognises our Memorandum
of Understanding with the Department of Health. The Memorandum of Understanding describes the
Department of Health requirements for compliance with the microbiological, health chemical and
radiological parameters specified by the National Health and Medical Research Council (NHMRC) in
the 2004 Australian Drinking Water Guidelines (ADWG). The 2004 ADWG were the current version
of the Guidelines available for use in Australia in 2011/12. NHMRC have undertaken a revision
process to the guidelines and a new version was released in October 2011. The Water Corporation
has started to implement the 2011 ADWG in agreement with the Department of Health.
For aesthetic parameters, the Memorandum of Understanding states that “we should aim to comply
as far as practicable, with the Guidelines for non-health related characteristics as set out in the
2004 ADWG. However, bearing in mind the high levels of public expenditure which would be
required to achieve full compliance in respect of some small water supplies, it is accepted that
achievement of this aim may take many years.”
The ADWG includes a Framework for best practice management of drinking water supplies. The
Framework incorporates a preventative risk management approach for drinking water from
catchment to consumer. Department of Health has not set a time period for the full implementation
of the Framework as it is considered that this work is ongoing since it involves a continuous cycle
of review and improvement. Since 2003 however, we have set out a program of works to progress
the rolling implementation of the Framework. Recent internal and external benchmarks show we
are very well advanced in implementing the Framework. For more information on our program of
water quality improvements refer to the section on Improving Your Water Quality (page 39).
19 Drinking Water Quality Annual Report 2011/12
Multiple barrier approach
Preventing contamination and minimising potential hazards is an essential part of providing you
with safe drinking water. The ADWG provide greater emphasis to the concept of using multiple
barriers to ensure the safety of drinking water. Barriers include:
• Protected catchments and groundwater recharge areas
• Large reservoirs with long water detention (storage) times
• Water treatment (refer to section “How is your water treated?”)
• Disinfection of water
• Maintaining chlorine residuals through the distribution system
• Ensuring tanks and bores are sealed to prevent contamination.
We have been working over an extended period to implement the multiple barrier approach
throughout our drinking water systems. To achieve this we are well advanced with an extensive
program of capital improvements covering some 2,500 individual projects.
Water Safety Plans
The development of Water Safety Plans is a process we use to meet the DoH requirement to
implement the Framework for Management of Drinking Water Quality contained within the 2004
ADWG. Water Safety Plans use a systematic risk management approach from catchment to tap
assessing the risks to each water supply, ensuring that appropriate preventative measures are in
place, and identifying the operational controls necessary to consistently ensure the safety of
drinking water. In 2011/12 we developed and implemented the remaining 24 Water Safety Plans
for the State and completed an in-depth review of 28 Water Safety Plans.
Source Protection
Protection and management of drinking water
catchments is the most important barrier to
contamination of drinking water as it ensures the
highest quality raw water is used for drinking
water. The ADWG recognises that “prevention of
contamination provides greater surety than
removal of contaminants by treatment, so the most
effective barrier is protection of source water to the
maximum degree practical”.
Department of Water has statutory responsibility
Reservoir Protection sign, Mundaring
for water source protection in Western Australia.
Weir
Drinking water catchments are gazetted and
protected under the Metropolitan Water Supply, Sewerage and Drainage (MWSSD) Act 1909 or the
Country Areas Water Supply (CAWS) Act 1947.
We work closely with the Department of Water to develop State-wide source protection policies,
guidelines and standards. An Operational Agreement between the Department of Water and Water
Corporation delegates on-the-ground management of many catchments to the Corporation. We
have documented procedures and manuals to guide catchment operations and ensure compliance
with our delegated responsibilities.
20 Drinking Water Quality Annual Report 2011/12
Catchment Management Strategies have been developed for every drinking water source to
identify, assess and minimise adverse impacts on water quality which may result from land uses
and other activities within the catchment.
Each Catchment Management Strategy includes a risk assessment of the land uses and catchment
activities. Potential risks to drinking water quality are identified and used to determine the water
sampling and catchment surveillance program. Regular catchment surveillance ensures we are
aware of activities or changes in our catchments. Other responsibilities include feral animal control,
weed control, fire prevention, rubbish removal, event-based water sampling, community education,
mining and forestry operation inspections and pollution response.
These actions protect the natural purification processes in our dams and aquifers and reduce the
risk of contamination of our raw water sources. In this way, our source protection program also
works towards corporate sustainability goals, minimising the need for expensive, energy and
chemical consuming water treatment plants at our water sources.
The greatest risk to consumers is from pathogens particularly from human and domestic animals.
These microorganisms can be carried by humans and animals and may be transferred into our
drinking water sources. Activities in close proximity to the reservoir and feeder streams pose the
greatest risk. To provide extra protection where it is needed the most, legislation includes
provisions for the establishment of a 2km exclusion area known as a Reservoir Protection Zone
around only metropolitan surface water sources and Wellhead Protection Zones of either 300 m or
500 m around drinking water production bores. In the outer catchments, the risk of pathogen
contamination is minimised by restricting access to only passive recreational activities such as
hiking and mountain-biking on designated trail
.
21 Drinking Water Quality Annual Report 2011/12
Monitoring
In accordance with drinking water guidelines, we
run an extensive drinking water quality monitoring
program to confirm the safety of the water we
provide to our customers. We take more than
65,000 water samples each year from water
sources, treatment plants and pipe networks
which supply our customers, and have in excess
of 275,000 individual analyses performed by our
contracted analytical laboratories.
All our water quality monitoring and reporting is
coordinated through our Water Quality
Management System. This software provides
many aspects of water quality management and
Bushwalking on the Bibbulmun Track
acts as the central database for all information on
in the outer Canning River Catchment
drinking water quality including sampling program
design, sampling analysis, monitoring and reporting. The Water Quality Management System also
automatically issues alerts for results outside guideline and operational limits and prompts remedial
action.
Engagement with Department of Health
Department of Health is the regulator of drinking
water quality in Western Australia. In November
2007, we entered into our third Memorandum of
Understanding with the Department of Health for
managing drinking water quality, our area of control.
The Memorandum of Understanding connects all
facets of nationally and internationally recognised
drinking water guidelines, standards, and quality
management assurance systems. It requires the
Water Corporation to notify the Department of Health
within 24-hours when any sample exceeds a set
health value or where any other event could pose a
risk to public health. The Department of Health
reviews our monitoring results and corrective
actions.
The current Memorandum of Understanding provides
for the Department of Health to conduct a
performance review of our systems and databases
used to manage and report drinking water quality. In
consultation with the Economic Regulation Authority, the Department of Health commissions audits
to cover a three year period in line with our Operating Licence audit. The next audit is in 2012.
Audit reports are published on our website.
22 Drinking Water Quality Annual Report 2011/12
Overflow of Harding Dam after cyclone
Incident response
While every effort is made to prevent water quality incidents from occurring, there will inevitably
be times when things go wrong due to equipment failure, human error, extreme weather conditions
or unforeseen events. We have incident management plans and procedures to manage such events
with the minimum possible impact on water quality and where necessary involve the Department of
Health to minimise risk to the public.
23 Drinking Water Quality Annual Report 2011/12
Case Studies
We have three case studies which illustrate some of the initiatives we have undertaken to improve
drinking water quality.
What activities are allowed in drinking water catchments?
Challenge
A drinking water catchment is an area of land where rainfall collects in rivers and streams that flow
into reservoirs, or seeps into the soil to become groundwater where it is stored in underground
aquifers. The captured water later becomes drinking water for the community.
Land uses and activities within drinking water catchments may adversely impact water quality.
There are three main types of contamination:
• Microbiological (protozoa, bacteria, viruses) – often associated with faecal material from
humans (from septic tanks or direct waterbody contact) or domestic animals (such as cows).
• Chemical often associated with fuel spills, rubbish dumping, pesticides or fertilisers.
• Physical such as turbidity (cloudiness). This may be caused by erosion and runoff associated
with fires, pigs wallowing, and vehicles or animals on unsealed roads or reservoir banks.
Solution
Protected drinking water catchments provide a
significant ‘natural’ barrier to contamination and yield
high quality water. By protecting our drinking water at
the source, we minimise the risk of contamination and
reduce the level of treatment required before it is
supplied to the community. Source water protection is
a crucial step to ensuring safe, good quality drinking
water. The Australian Drinking Water Guidelines
(ADWG) state “prevention of contamination provides
greater surety than removal of contaminants by
treatment, so the most effective barrier is protection of
source water to the maximum degree practical”.
Results
Water Corporation proactively manages and
protects drinking water catchments by undertaking
catchment surveillance and inspections, by-law
enforcement, water sampling, and providing land
use planning advice. Some activities are not
permitted within drinking water catchments as they
increase the risk to water quality.
24 Drinking Water Quality Annual Report 2011/12
Harding Dam
Drinking Water Catchment
To prevent pollution the following are
PROHIBITED
marroning
fishing
camping
boating
polluting
shooting
hunting
swimming / wading
dogs
horses
trail bikes
off road vehicles
Way forward
In September 2010, a Parliamentary Standing Committee delivered their final report on the Inquiry
into Recreational Activities within Public Drinking Water Source Areas (PDWSA’s). The report
concluded the use of public drinking water source areas for both recreation and drinking water is
untenable.
The Water Corporation strongly advocates source protection and is committed to the primacy of
drinking water quality over other catchment land uses. This is reflected in our Drinking Water
Source Protection Policy. To achieve this, and in partnership with Department of Water, other
government agencies and our stakeholders, we will:
• Employ the source protection principles of the ADWG by recognising source protection as a key
component of our drinking water quality management system.
• Recognise that treatment is not a safe, practical or economic substitute for robust source
protection practise. The Corporation implements a multi barrier approach to drinking water
quality management, which begins with source protection.
•
Maintain active catchment protection programs to prevent contamination or degradation of our
drinking water sources by ensuring land uses and activities within catchments comply with
approval conditions and best management practices.
• Work closely with Department of Water and key stakeholders to protect drinking water
catchments by upholding, supporting and promoting catchment protection despite pressure for
competing land uses.
Protecting drinking water from catchment to customer
pH and Alkalinity Correction using Calcite Pellets
Challenge
Many of the water sources used by the Water Corporation require
pH or alkalinity correction due to their natural corrosive nature
and/or to correct pH impacts of the treatment processes applied to
the water. Typically an alkaline material (soda ash, caustic soda,
lime, etc) must be added to the water to achieve the desired pH or
alkalinity correction.
The source groundwater for Neerabup Water Treatment Plant
(WTP) in Perth’s northern suburbs is naturally very alkaline, or
‘hard’, and uses a unique crystallization process to treat this. The
by-product of this process is calcite (essentially pure calcium
carbonate, or CaCO3) which precipitates onto a garnet sand particle
25 Drinking Water Quality Annual Report 2011/12
Calcite pellets with Garnet
sand seed (pellets usually
1-2mm, diameter)
in an ‘up flow’ reactor in which water rises from the bottom to the top of a reactor and the pellets
and garnet sand are kept in suspension. The mature calcite is removed periodically and some is
sent to a soil wholesaler.
Solution
In 1998, a project was started to investigate the feasibility of using the calcite pellet by-product
from the Nerabup WTP as a cost effective and robust pH and alkalinity correction process for acidic
water. The investigation set out to determine if the pellets could be used as a viable alternative to
the standard water treatments that are capital intensive and have a high operational and
maintenance cost.
Results
In 2005, trials of calcite pellets were completed. The key findings were:
• Target pH and alkalinity levels can be easily achieved using sufficient calcite pellets and
selecting an appropriate carbon dioxide dose.
• However, calcite pellets left a garnet sand residue as the calcite was stripped off, and this
built up in the filter media, increasing filter pressure and proving difficult to remove.
• Calcite pellets produced using a calcium based seed such as lime sand dissolved during
treatment and left no unwanted residue when used as a filter medium.
A full scale trial was conducted in mid 2008 using two of the lime crystallization reactors at
Neerabup. This concluded that the lime sand performed as well as, and in some instances better
than, the garnet seeding material. In what is considered a ‘world first’, the garnet sand was then
replaced by lime sand in late 2009, and this has been produced ever since.
Trials were then conducted using the new lime sand seeded calcite at Lexia WTP. Both trials
indicated the use of the lime sand based calcite pellets as a filter media was able to increase pH
and alkalinity, reducing the need for lime or caustic dosing.
The use of calcite in large scale water filters as a dual pH corrective agent and filter media for the
production of potable water is not known to occur anywhere else and is therefore unique when
compared to common practise among other water utilities.
Garnet sand build-up (purple) that prevented the calcite being used in filter beds
Way forward
It is anticipated that calcite pellets will have a wide application within Western Australia, and the
process is available for possible adoption in other suitable water treatment plants in Australia. The
Corporation is looking at other treatment plants within WA to see if they would be compatible with
the use of calcite pellets for pH and alkalinity correction. This technology can be used with any
water source where pH and alkalinity correction is required (surface water and some groundwater
sources).
26 Drinking Water Quality Annual Report 2011/12
Reduction in the use of lime and caustic soda made possible by using calcite pellets in water
treatment has clear benefits for the environment. Production of lime is an energy intensive process
compared with the production of calcite pellets which only require a much smaller carbon dioxide
dosing system.
It is anticipated that this innovation will have several social benefits. Due to the calcite pellets
ability to saturate water with a calcium carbonate there is no need for sophisticated calculations to
determine correct lime and/or CO2 dosing. This allows a robustness and flexibility suitable for
different flow rates and therefore greater reliability in water quality.
Another major benefit is that the reduction or
replacement of existing chemicals reduces OSH
concerns when handling chemicals. Lime dosing
plants can be untidy and unpleasant to work with.
Caustic soda is highly corrosive and reactive,
requires a great deal of care when handling and any
contact with skin etc requires immediate attention.
By reducing the need for the use of chemicals the
workforce enjoys a safer work place.
From a sustainability perspective there are a number
of positive outcomes as this new treatment process
represents the reuse of a waste product to replace
products that require large amounts of energy and
are costly and hazardous to produce and use.
This project won the Australian Water Association’s
National Water Award in the Infrastructure Project
Calcite pellets loaded into filter beds at Lexia
WTP for trial
Innovation category, in May 2012. This was
fantastic recognition for all those involved in the
project over the many years of its evolution. Additionally it was a fitting tribute to Laszlo Koska,
the scientific leader and architect of this innovation, who sadly passed away in early 2011.
27 Drinking Water Quality Annual Report 2011/12
Rehabilitation of Happy Valley Water Reserve, Brookton
Background
Brookton Happy Valley Water Reserve is located within the Avon Wheatbelt region 140 kilometres
east of Perth and eight kilometres north of Brookton. The Water reserve consists of two production
bores and one monitoring bore that draw water from a locally recharged shallow, unconfined
aquifer system (<15m to water table). The bores are used to augment the water supply to the
town of Brookton, during the summer, as the supply from the GSTWS cannot meet full demand.
The bores usually operate between November and April.
Challenge
The site was historically used predominantly for
cattle grazing in addition to cereal cropping and
sheep. The farming of cattle and the sandy nature of
the soil resulted in the area becoming significantly
degraded. The Department of Water’s Source
Protection Plan for Happy Valley Water Reserve
recommended that the area be rehabilitated to
reduce the microbiological risks associated with the
cattle farming.
Solution
Soak for cattle adjacent to bore in the Water
Reserve prior to land purchase in 2009
In 2009 the land was purchased by the Department
of Water, the cattle were removed and
rehabilitation became a viable option for source protection. Tree planting provides many benefits in
that it protects water quality as well as producing a carbon offset for the Corporation. It also
produces a cost-neutral water source protection solution for the Department of Water.
Results
Our Drinking Water Quality Branch in addition to the
Department of Water, Men of the Trees, Carbon Neutral
and associated contractors have been involved with the
project so far. Over 31 hectares of the Wellhead
Protection Zone has been planted with 31,700 stems of
native, local provenance, plant species. Recent
inspection of the 31,700 seedlings planted last winter
showed the trees are thriving.
Way forward
Men of the Trees working with seedlings
The Department of Water will plant 20,000 more trees
within the Water Reserve this year, following the success
of the first planting. A total of 90 hectares of the 420 hectare property has been earmarked for
revegetation, involving approximately 90,000 trees.
An ongoing rehabilitation program including weed monitoring, maintenance and rehabilitation
completion criteria will continue for the next five years.
28 Drinking Water Quality Annual Report 2011/12
How is your water treated?
Water treatment plants
The specific water quality of each source dictates
the type of treatment required. Where water
comes from fully protected catchment areas, very
little treatment is required – just disinfection. In
other cases, more intensive treatment processes
may be required to ensure the drinking water
delivered to every house is safe and aesthetically
pleasing.
Groundwater, which is pumped from underground
aquifers, can be treated to remove dissolved
gases, iron, manganese, colour and turbidity. In
Schematic showing the MIEX treatment process
Perth, groundwater treatment plants at Jandakot,
Wanneroo, Lexia, Mirrabooka and Gwelup oxidise
the water (via aeration and/or chlorination) to increase the amount of dissolved oxygen and
remove both carbon dioxide and hydrogen sulphide. A coagulant (alum) is also added, that
increases the settling of fine particles caused by iron and natural organic matter. Clarified water
then passes through sand filters to remove any remaining particles. Similar processes occur in
many country supplies.
At Neerabup Water Treatment Plant, technology has been
introduced to soften the water and reduce salinity. This is the first
time this process has been applied in the southern hemisphere, and
reduces the problems of scale in kettles and hot water systems, and
soap that fails to lather.
Naturally occurring organic substances present a problem for many
water sources in that they add colour to the water, increase taste
and odour complaints and provide precursors for disinfection byproducts. Since 2001, we have used a water treatment technology
known as MIEX (magnetised ion exchange) to prevent an
Aerators at Neerabup Water
intermittent “swampy” odour occurring in treated groundwater
Treatment Plant
supplied to Perth’s northern suburbs. Unlike conventional
processes, MIEX resin more effectively removes dissolved organic carbon (DOC) from drinking
water, the source of the odour and taste concerns.
The schematic figure shows how the resin mixes with raw water in the stirred contactors. In the
contactors, the resin rapidly adsorbs DOC from the raw water. In the settler, the resin (with
attached DOC) is then separated from the treated water. Since commissioning, the MIEX
Treatment Plant has provided a considerable reduction in swampy odour complaints from localities
supplied from the Wanneroo Groundwater Treatment Plant.
29 Drinking Water Quality Annual Report 2011/12
Desalination
Desalination, using reverse osmosis, has been used at Denham
for many years, to treat brackish groundwater. Reverse osmosis
was the desalination process chosen for both the 45 gigalitre per
year Perth Seawater Desalination Plant, which has been
operational since November 2006 and the Southern Seawater
Desalination Plant, which began supply ahead of schedule in
September 2011.
Reverse osmosis membrane racks
at Kwinana
Similar technology exists at Leonora and Gascoyne Junction to
improve the aesthetic water quality (hardness and total dissolved solids). Other methods of
desalination available include Electrodialysis Reversal (EDR) installed at Wiluna during 2009.
Ultra-filtration
Ultra-filtration treatment is a form of membrane filtration where
source water is forced through a semi-permeable membrane. It
is designed to remove suspended solids, bacteria, viruses and
other pathogens to produce water with very high purity.
Ultra-filtration is being used at Wyndham, Harding Dam,
Pemberton, Denmark, Margaret River, Hyden, Walpole, Gascoyne
Junction, Salmon Gums, Greenbushes and Kirup.
Disinfection
Ultra-filtration membrane racks at
Pemberton
Disinfection is our primary barrier against harmful pathogenic
bacteria and viruses in our water supply systems. Chlorination is
the most common form of disinfection used by the Corporation
and other water utilities throughout the world. The chlorine dose
is maintained within a narrow range to ensure adequate
disinfection is achieved while only having a minimal effect on
the taste of our water.
Other forms of disinfection include chloramination and
ultraviolet light. Chloramination involves the use of chlorine and
ammonia to produce a longer lasting disinfectant.
Harding Dam Treatment Plant
Chloramination is used in the Goldfields and Agricultural Water
Supply Scheme to maintain a disinfectant residual along the
length of the extensive pipe network. Ultraviolet light is used in
combination with chlorination at some towns.
Chlorination disinfection system,
Margaret River
30 Drinking Water Quality Annual Report 2011/12
Fluoridation
Public water supplies are fluoridated due to the
properties of fluorine which reduce dental cavities. Poor
dental health is extremely debilitating and remains a
major public health concern. Fluoride strengthens the
enamel (surface) of teeth making them more resistant
to cavities. Fluoridation also benefits all of the
community, at a low cost.
In Western Australia, fluoridation is regulated by the
Fluoridation of Public Water Supplies Act (1966) which is
administered by the Department of Health. The
Fluoridation of Public Water Supplies Advisory
UV disinfection unit
Committee (FAC) oversees fluoridation and makes
recommendations to the Minister for Health who may issue or rescind directives as appropriate.
To maximise the public health benefit from fluoridation the FAC has initially sought to ensure larger
towns with a population exceeding 3,000 are given priority for fluoride. Currently, over 90% of the
State’s population receive the benefits of fluoridation.
Dose rates have been set to provide consumers with a prescribed amount of fluoride based on
water consumption. As average water consumption is proportional to ambient temperatures
different dose rates have been set out for various parts of the State.
A maximum dose rate of 1 mg/L is prescribed in the Act. Not
withstanding the provisions of the Fluoridation of Public Water
Supplies Act the maximum health related criteria for fluoride is
1.5 mg/L in the 2004 ADWG.
Most water supplies have some natural fluoride concentration
varying from less than 0.1 mg/L in surface waters through to
greater than 1.5 mg/L in some groundwater sources. Hence
the water fluoridation process involves adding or removing
fluoride to the necessary targeted fluoride concentration.
Fluoridated water supplies (see Table 1) are sampled at least
weekly to confirm acceptable fluoridation performance.
Fluoridation performance is reported monthly to the
Department of Health and periodically to the Fluoridation
Advisory Committee and the Advisory Committee for Purity
Fluoride injection point at the Perth
of Water.
Seawater Desalination Plant, Kwinana
Water fluoridation is supported by the World Health
Organisation, the Australian Dental Association, the Australian Medical Association and the National
Health Medical and Research Council. Table 1 shows the localities and schemes which we are
required to fluoridate.
31 Drinking Water Quality Annual Report 2011/12
Table 1: Localities requiring fluoridation
under Fluoridation of Public Water Supplies
Act (1966)
Locality
Broome
Derby
Dunsborough (de-fluoridated) 1
Esperance
Exmouth
Manjimup
Myalup
Goldfields & Agricultural Water Supply Scheme
Kalgoorlie
Merriden
Northam
York
Great Southern Towns Water Supply Scheme
Collie
Katanning
Narrogin
Lower Great Southern Towns Water Supply Scheme
Albany
Mt Barker
Geraldton Regional Water Supply Scheme
Geraldton
West Pilbara Water Supply Scheme
Karratha
Perth Integrated Water Supply Scheme
Armadale/Kelmscott
Bold Park
Buckland Hill
Foothills
Greenmount
Greenmount/Darlington
Hamilton Hill
Harvey
Hills Direct
Lake Thompson
Lexia
Mandurah
Melville
Mirrabooka
Mt. Eliza
Mt. Hawthorn
Mt. Yokine
Mundaring
Neerabup
Pinjarra
South Perth/Kewdale
Tamworth Hill
Wanneroo
Waroona
West Yokine
Whitfords
Advisory Committee
recommended fluoride
range
0.6 - 0.8 mg/L
0.5 - 0.7 mg/L
0.7 - 1.0 mg/L
0.7 - 1.0 mg/L
0.6 - 0.8 mg/L
0.7 - 1.0 mg/L
0.7 - 1.0 mg/L
1
0.7
0.7
0.7
0.7
-
1.0
1.0
1.0
1.0
mg/L
mg/L
mg/L
mg/L
0.8
0.8
0.8
0.8
mg/L
mg/L
mg/L
mg/L
0.7 - 1.0 mg/L
0.7 - 1.0 mg/L
0.7 - 1.0 mg/L
0.8 mg/L
0.8 mg/L
0.8 mg/L
0.7 - 1.0 mg/L
0.7 - 1.0 mg/L
0.9 mg/L
0.9 mg/L
0.7 - 1.0 mg/L
0.8 mg/L
0.6 - 0.8 mg/L
0.7 mg/L
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.7
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
0.9
-
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
Defluoridation is currently not covered by the Fluoridation Act.
concentration have been specified to provide a duty of care target.
32 Drinking Water Quality Annual Report 2011/12
Advisory Committee
recommended optimum
fluoride concentration
0.7 mg/L
0.6 mg/L
0.9 mg/L
0.9 mg/L
0.7 mg/L
0.9 mg/L
0.9 mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
The recommended range and optimum
Understanding water quality
test results
The following summaries are intended to assist you to interpret the results presented in this report.
Additional information can be obtained by referring to the Fact Sheets contained in the ADWG
published by the National Health and Medical Research Council and our website.
For the purposes of this report, all data are assessed in relation to the ADWG.
Escherichia coli
Escherichia coli (E. coli) replaced thermotolerant coliforms as the key indicator of microbiological
performance during 2010/11. E. coli are a subgroup of thermotolerant coliforms and a more
specific indicator for faecal contamination. Any detection of E. coli is responded to immediately to
ensure water supplied to customers is free of any potential microbiological contamination.
Thermophilic Naegleria
Thermophilic Naegleria refers to a group of amoebae which includes Naegleria fowleri, the
organism that causes the waterborne disease primary amoebic meningoencephalitis. In the context
of this report, Thermophilic Naegleria refers to those tolerant to 42°C. The Department of Health
has set a compliance target of between 75 and 95 per cent of samples being free of Thermophilic
Naegleria (dependent on population size). The Department of Health Naegleria protocol can be
found here.
Fluoride
Fluorine is one of the most abundant elements in the Earth’s crust, and is typically found as the
fluoride ion or as organic or inorganic fluorides. It is found naturally in groundwater supplies, and is
present in most food and beverage products and toothpaste. Additional fluoride is added to a
number of water supplies in Western Australia as directed by the Minister for Health (refer to How
is your water treated? - Fluoridation). The fluoride concentration after dosing is set by the
Fluoridation of Public Water Supplies Advisory Committee, and does not exceed
1 mg/L.
Notwithstanding this, the ADWG health guideline for fluoride is 1.5 mg/L, applicable to both
fluoridated and non-fluoridated localities.
Aluminium (acid-soluble)
Acid-soluble aluminium in water primarily originates from the addition of coagulants such as
aluminium sulphate or poly-aluminium chloride in the water treatment process. These coagulants
are added to aid the removal of colour and turbidity. Aluminium can accumulate in pipe sediments,
and be re-suspended during periods of rapid changes to flow patterns. The ADWG specify an
aesthetic guideline of 0.2 mg/L. No health guideline is set.
True colour
Colour in water originates mainly from natural drainage through soil and vegetation in a
catchment. Corroding metal pipes can also discolour the water, with iron producing a brownish
colour and copper a faint blue colour. The ADWG specify an aesthetic guideline of 15 TCU (True
Colour Units). As a guide, 15 TCU is just noticeable in a glass.
33 Drinking Water Quality Annual Report 2011/12
Hardness (as calcium carbonate)
Hard water requires more soap to obtain a lather. It can also cause scale to form on hot water
pipes and fittings. Hardness is caused by the presence of dissolved calcium and magnesium. Water
with hardness:
•
less than 60 mg/L is soft and possibly corrosive (depends on pH, alkalinity and dissolved
oxygen concentration),
•
between 60 and 200 mg/L is deemed good quality for all domestic uses,
•
between 200 and 500 mg/L will increase scale formation and
•
greater than 500 mg/L will cause high scaling.
Hardness can be an important issue when purchasing appliances such as dishwashers. To convert
the hardness values presented in this report to dH (German degree) units, divide by 17.8. To
convert hardness to millimol (mmol) units, divide by 100 and to convert to milliequivalent (mEq)
divide by 50.
The ADWG specify an aesthetic hardness guideline of 200 mg/L.
Iron
Iron occurs naturally in water as a result of contact
with soil or rock in the catchment. It can
accumulate in pipe sediments, and be resuspended during periods of rapid changes to flow
patterns. Elevated concentrations cause discoloured
water and can stain laundry.
The ADWG specify an aesthetic guideline of 0.3
mg/L.
Manganese
Manganese in water can come from contact with
soil or rock in the catchment. It can accumulate in
pipe sediments, and be re-suspended during
Drinking water sampling point
periods of rapid changes to flow patterns.
Elevated manganese can make water look black
and stain laundry. The ADWG specify an aesthetic guideline of 0.1 mg/L.
pH
pH is a measure of water acidity (pH 7 is neutral). The ADWG specify a lower and upper aesthetic
value of 6.5 and 8.5 respectively. The guidelines allow for a pH of up to 9.2 for new concrete tanks
and cement-lined pipes, which can significantly increase the pH for a short period of time. Elevated
pH is often caused by calcium carbonate leaching from the protective cement lining of the pipes
after long transit times. This characteristic is found at a number of localities on our large water
supply schemes. Where low pH is experienced, this is typically a characteristic of the source
supplying the locality. Buffering is a treatment process that stabilises the pH of the water.
34 Drinking Water Quality Annual Report 2011/12
Total dissolved solids
Total dissolved solids (TDS) consist of inorganic (natural) salts and small amounts of organic
matter dissolved in water. Total dissolved solids comprise sodium, potassium, calcium, magnesium,
chloride, sulphate, bicarbonate, carbonate, silica, organic mater, fluoride, iron, manganese, nitrate
and phosphate.
Water with low TDS can taste flat, while
water with high TDS tastes salty and causes
scaling in pipes, fittings and household
appliances. The ADWG provide guidance in
the palatability of drinking water according to
TDS concentration:
•
between 0 and 600 mg/L is good quality
•
600 to 900 mg/L is fair
•
900 to 1200 mg/L is poor, and
•
greater than 1200 mg/L,TDS is
unacceptable/unpalatable.
The ADWG guideline of 600 mg/L is based on
taste.
Turbidity
Dosing Plant at Ten Mile Brook Dam, Margaret River
Turbidity is the cloudy appearance of water
caused by the presence of suspended matter.
The ADWG specify an aesthetic guideline of 5
NTU (turbidity is expressed in nephelometric turbidity units (NTU)) which is just noticeable in a
glass of water.
Nitrate
In Western Australia, elevated nitrate concentrations are usually due to the natural process of plant
decay underground that has occurred over geological time. The ADWG specify a health guideline of
11.3 mg/L (measured as nitrogen) for infants less than 3 months old and a guideline of 22.6 mg/L
(measured as nitrogen) for adults and children over three months old. Nitrate poisoning is very
rare and to date no case, due to nitrate in drinking water, has been recorded in Western Australia.
Where the nitrate concentration is between 11.3 and 22.6 mg/L, and there is no alternative supply,
water providers may apply to the Department of Health for an exemption from the guideline.
The following localities have been granted exemption from compliance with the nitrate guidelines
by the Department of Health:
•
•
Mid West Region - Cue, Meekatharra, Mt Magnet, Nabawa, New Norcia, Sandstone, Wiluna and
Yalgoo.
Goldfields and Agricultural Region - Laverton, Leonora and Menzies.
In these towns, the Community Health Nurse provides advice to nursing mothers regarding the use
of alternative water for the preparation of bottle feeds. We provide bottled water free of charge via
the Community Health Nurse as required.
35 Drinking Water Quality Annual Report 2011/12
Trihalomethanes
Trihalomethanes (THMs) are present in drinking water as a by-product of disinfection using
chlorination (and chloramination to a lesser extent). We are required to comply with the ADWG
health guideline of 0.25mg/L expressed as an average long term exposure. For the purposes of this
report, THM compliance is assessed comparing the guideline with the mean annual THM
concentration.
Summary table and sample groups
Appendix A contains a list of the constituents within the metals, hydrocarbons, pesticides,
radiological and chemical (other) sample groups, and their respective guideline values, and
sampling location.
36 Drinking Water Quality Annual Report 2011/12
Performance at a glance
Health related performance
An excellent microbiological performance occurred in 2011/12 with 100 per cent of localities
complying with the Escherichia coli requirement which is the most important indicator of faecal
contamination (see graph below).
Compliance with health-related chemical guidelines is also high with 100 per cent of all localities
meeting the guidelines. As most chemical guidelines are based on lifetime exposure and have large
safety factors, an occasional result outside the guidelines does not mean the water is unsafe to
drink. For this report, compliance is met if the mean chemical concentrations for the year are less
than the guideline value.
However, if a sample result exceeds the maximum concentration recommended in the ADWG, it is
responded to quickly and appropriate remedial actions are undertaken.
The Department of Health is notified of all exceptions and is closely involved in the response
process.
Non-health (aesthetic) related performance
While we strive to meet the ADWG for aesthetic characteristics, this is very difficult to achieve in a
State as vast as Western Australia with a wide variety of water sources. This is especially the case
in some of our small country water supplies where there can be very few sources of drinking water
available and where installation of treatment can be very costly. We are committed to improving all
aspects of drinking water quality, however, improvements in aesthetic water quality are often hard
to achieve. The State Government (through the Ministers for Health and Water Resources) has
recognised that meeting the aesthetic requirements of the ADWG will require considerable
expenditure and may take many years.
100%
100%
100%
Microbiological Performance
(E. coli)
Chemical Performance
(Health-related)
80%
60%
40%
20%
0%
37 Drinking Water Quality Annual Report 2011/12
Detailed performance review for 2011/12
Appendix B shows a detailed summary of test results for each locality throughout the state.
The following graph shows the overall aesthetic performance for 2011/12. The left-hand bar shows
the percentage of 244 localities where the mean concentration for the year is less than the
aesthetic guidelines. In 2011/12, around 68 per cent (165 out of 244) of our localities met all of
the aesthetic guidelines. The right-hand bar shows our performance for all aesthetic analyses
(aluminium, true colour, hardness, iron, manganese, pH, TDS, turbidity, sodium, chloride,
sulphate) across our 244 localities. Our total performance was 92 per cent, with 8,134 out of 8,844
analyses complying with the aesthetic guidelines.
The results in Appendix B show a relatively small number of excursions above the guidelines in
aesthetic quality. These excursions are caused by the unique quality of local sources, lack of
alternative sources, impact of climate change on groundwater production and abstraction from
groundwater in proximity to the coast.
For many localities, these excursions have only minimal influence on the taste of the drinking
water.
The graph below shows the challenge of supplying aesthetically pleasing drinking water to many
smaller towns with limited available water resources.
38 Drinking Water Quality Annual Report 2011/12
Health performance review 2004 to 2012
For the past eight years, the microbiological performance has been excellent with 100 per cent of
the metropolitan and country localities complying with the thermo-tolerant coliform requirements.
For chemical-health, there is similar high performance over this period.
39 Drinking Water Quality Annual Report 2011/12
Customer expectations
Customer contacts
Water quality related customer contacts are recorded and monitored continuously to identify any
trends and areas for improvement.
In 2011/12 our Operations Centre received 7,898 water quality related customer contacts
(compared with 6,885 in 2010/11). Of these about 74 per cent related to discoloured water, 8 per
cent to taste and odour, 6 per cent to stained laundry and 3 per cent to white water. Our Customer
Charter states that we will respond within two hours or at an agreed time to any reports of poor
water quality (water quality faults). In 2011/12 once a fault was recorded we responded to 94.6
per cent within the target of two hours (see figure below).
Customer Service - Water Quality
100
350
250
95
200
150
90
100
50
85
0
JUL 11
AUG 11
SEP 11
OCT 11 NOV 11 DEC 11
Faults Recorded
JAN 12
Responsiveness
40 Drinking Water Quality Annual Report 2011/12
FEB 12 MAR 12 APR 12 MAY 12 JUN 12
Target
Responsiveness (%)
Number of Faults
300
Customer research
We measure community perceptions of the quality of tap water through our Customer Alignment
Measure (CAM) survey. In this survey, customers are asked to indicate the degree to which they
either agree or disagree with two statements in relation to water quality (where 1 is ‘strongly
disagree’ and 5 is ‘strongly agree’). The average rating for these two statements in June 2012 was
3.9 and previous survey results are shown below.
Residential Water Product
a) “They have consistent quality”
b) “They are an acceptable standard of
quality”
Average
Jun 09
3.9
3.9
Dec 10
3.9
3.8
Mar 11
3.9
3.9
Jun 11
3.9
4
Jun 12
3.9
3.9
3.9
3.9
3.9
3.9
3.9
41 Drinking Water Quality Annual Report 2011/12
Improving your water quality
Australian Drinking Water Guidelines
The Memorandum of Understanding, between the Water Corporation and the Department of
Health, acknowledges that significant changes have occurred in the water industry in Western
Australia since 1996. The ADWG “Framework” approach, is designed to integrate all facets of the
drinking water quality management and assurance system.
The ADWG identify catchment management and source protection as key elements of the multibarrier approach to ensure safe drinking water. We are committed to maintain and improve these
primary barriers.
Both the Water Corporation and Department of Health have contributed to the development of the
Drinking Water Quality Framework arising from the rolling revision of the 1996 ADWG. We are
committed to applying the ADWG throughout Western Australia as this will provide a significant
opportunity to reinforce the importance of protecting drinking water through all aspects of drinking
water supply.
The Australia Drinking Water Guidelines (ADWG)
define the requirements for safe drinking water in
Australia. In October 2011, the National Health and
Medical Research Council released the latest
version of the ADWG which included a major
rewrite of monitoring chapters 9 & 10, authored by
our own Dr Samantha Rizak and Richard Walker of
Drinking Water Quality Branch.
A key enhancement of the ADWG 2011 has been
the strengthening of operational monitoring which
is critical in continuously confirming barrier risk
assessments. This guidance away from traditional
verification monitoring, will assist utilities to
determine whether their drinking water systems
can reliably deliver safe drinking water under all
conditions.
The Water Corporation has agreed with the
Department of Health to progressively adopt
changes in the ADWG 2011.
We have embarked on an extensive program of
water quality capital improvements covering some
2500 individual projects. These projects ensure
robust multiple barriers to contamination are in
42 Drinking Water Quality Annual Report 2011/12
Manjimup Dam and Chlorinator
place from “catchment to tap” for all Corporation
schemes. Examples of the work undertaken are described
below.
Water treatment
Additional treatment plants have been installed to meet
the lower chemical concentrations recommended by the
ADWG and to provide an additional barrier to
microbiological contamination.
At Wyndham, the ultra-filtration plant continues to deliver
high quality water to the town.
Manjimup Phillips Creek Dam Filtration
facilities
A new technology using S::CAN (UV-vis spectra
instrumentation) for monitoring raw water quality is providing feed forward control of coagulant
dose. This has major benefits for chemical dose optimisation in addition to improved water quality
through better organics removal. This technology was initially trialled at Mirrabooka GWTP (where
it is now ongoing) and is currently under trial at Harding Dam WTP.
Ensuring safe drinking water during times
of crises
In the past, the only practical option was to transport
drinking water by road tankers to affected areas. Now,
five mobile emergency ultra-filtration plants allow us to
rapidly restore high quality drinking water supplies. These
plants are mobilised quickly to provide a minimum of 500
kilolitres of high quality water per day. Other treatment
units are available for specialised applications including a
reverse osmosis unit.
Mobile units are currently deployed in Salmon Gums,
Kirup, Greenbushes, Gascoyne Junction and will soon be
deployed in Manjimup.
Chlorination unit at Cue, Mid West Region
Chlorination
Additional chlorination units are operating in country towns to ensure the important chlorine barrier
is maintained throughout the pipe networks which supply customers. We have developed a
standard design for chlorinators so that each unit has residual trim (to account for changes in
chlorine demand of the feed water), flow pace control (to account for changes in the flow rate and
provide even dosages) and auto-shut off (to ensure the unit will shut off the flow of water upon
failure).
Replacement of existing chlorination units with state-of-the-art equipment providing high
performance and reliability is nearly complete.
43 Drinking Water Quality Annual Report 2011/12
In 2011/12 we will commence a new state wide chlorination program to ‘improve’ older
chlorinators that were not replaced in the original ADWG program.
Tank roofs
Construction, repair or replacement of roofs on all reservoirs and tanks ensures stored water
cannot be contaminated with rainwater or pests/vermin.
Monitoring and control systems
Installation of instrumentation that allows continuous monitoring of key water quality parameters
at each water supply ensures unsatisfactory performance is detected quickly and remedial actions
initiated.
Monitoring and control systems
Installation of instrumentation that allows continuous
monitoring of key water quality parameters at each
water supply ensures unsatisfactory performance is
detected quickly and remedial actions initiated.
Pipes and pipelines
Construction of new pipelines and modification to the
flow of water through tanks and reservoirs prevents
stagnation of water in storage.
Disinfection in long pipes
Chlorine dose control and monitoring
system
A major corporate project has been running for seven
years to improve the chloramine residuals in the long
pipelines of the Goldfields and Agricultural Water Supply
(GAWS), the only chloraminated water supply system in
WA. This has involved a series of detailed investigations
across the scheme. One component included determining
the areas of nitrification, which is when natural aquatic
bacteria within the pipelines convert ammonia to nitrite,
causing a reduction in the extent of effective chloramine
residuals.
Measures that have been taken to expand the
John Hill Tank, Kambalda
maintenance of chloramine and chlorine residuals further
into the distribution system have included the installation
of numerous chlorine and ammonia dosing plants at strategic points in the system. Modifications
have also been made to many of the tanks by installing specially designed separate inlets to each
tank to ensure complete mixing. This, together with operating at lower water levels in the tanks
during the winter low demand period, minimises water stagnation and loss of residuals. These
measures have succeeded in significantly improving the water quality of the supply on the GAWS.
.
44 Drinking Water Quality Annual Report 2011/12
Summary
Supplying safe drinking water is our highest priority. In 2011/12, we achieved outstanding
compliance results for health-related characteristics and met all our health targets for drinking
water quality set by the Department of Health. However, we have ever increasing challenges to
meet the aesthetic requirements of the Guidelines. This is especially the case in some of our
remote country water supplies, where there are limited sources of water available, and where
installation of treatment to improve aesthetic quality is very expensive.
Although we meet all our obligations under our Operating Licence, we recognise there are always
opportunities for improvement. Our major focus in the short term is to maintain compliance with
the stringent 2011 ADWG.
Our longer term vision is to demonstrate full implementation the Framework for the Management
of Drinking Water Quality from catchment to tap, and we continue to make considerable progress
in this area.
One of the key issues
identified in our customer
research is that customers
require more information
about the quality of their
drinking water. This report
is an ongoing commitment
to providing customers with
detailed water quality
information in an open and
straightforward manner. If
you require more water
quality information, please
call 13 13 75 or email us.
Serpentine Pipehead Dam
45 Drinking Water Quality Annual Report 2011/12
Appendix A –
list of parameters
within sampling groups
This appendix lists the individual constituents included in the sampling groups referred to in this
report.
Metals
Constituent
Antimony
Cadmium
Chromium
Copper
Lead
Nickel
Zinc
Arsenic
Barium
Beryllium
Boron
Mercury
Molybdenum
Selenium
Silver
Uranium
Health Guideline
(mg/L)
0.003
0.002
0.05
2
0.01
0.02
3
0.01
2
0.06
4
0.001
0.05
0.01
0.1
0.17
Hydrocarbons
Constituent
Health Guideline
(mg/L)
Benzo(a)pyrene
0.00001
di(2-ethylhexyl) adipate
*
di(2-ethylhexyl) phthalate 0.01
Dialkyltins
*
Toluene
0.8
Tributyltin oxide
0.001
Xylene
0.6
1,1,1-trichloroethane
*
1,1-dichloroethane
*
1,1-dichloroethene
0.03
1,2-dichlorobenzene
1.5
1,2-dichloroethane
0.003
1,2-dichloroethene
0.06
1,3-dichlorobenzene
*
1,4-dichlorobenzene
0.04
Guideline
Sampling Location
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Guideline
Sampling Location
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
2011
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
System
* The guidelines state there is insufficient data to set a guideline based on health considerations.
46 Drinking Water Quality Annual Report 2011/12
Constituent
Health guideline
(mg/L)
0.001
0.3
0.004
0.3
Benzene
Chlorobenzene
Dichloromethane
Ethylbenzene
Ethylenediamine
tetraacetic acid
Hexachlorobutadiene
Nitrilotriacetic acid
Styrene
Tetrachloroethene
Trichlorobenzenes (total)
Trichloroethene
Trichloroethylene
Vinyl chloride
Guideline
0.25
0.0007
0.2
0.03
0.05
0.03
*
*
0.0003
Sampling Location
2011
2011
2011
2011
Reticulation
Reticulation
Reticulation
Reticulation
System
System
System
System
2011
2011
2011
2011
2011
2011
2011
2011
2011
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
Reticulation
System
System
System
System
System
System
System
System
System
* The guidelines state there is insufficient data to set a guideline based on health considerations.
Pesticides
The following pesticides are specifically analysed for by one of our contracted analytical
laboratories:
Constituent
Health guideline
(mg/L)
0.03
0.0003
0.04
0.002
0.01
0.009
0.0003
Guideline
2,4-dichlorophenoxyacetic acid
2011
Aldrin
2011
Atrazine
2011
Chlordane
2011
Chlorpyrifos
2011
DDT (total isomers)
2011
Dieldrin
2011
Heptachlor & heptachlor epoxide
(total)
0.0003
2011
Lindane
0.01
2011
Simazine
0.02
2001
In addition to the above specific analyses, screening for a large number of other pesticides is
undertaken on all samples (refer Appendix C for full list). Any detection is further analysed and the
result reported to the Water Corporation.
Other Health-related Chemicals
This group currently includes Cyanide (guideline of 0.08 mg/L) and Iodide (guideline of 0.1mg/L).
47 Drinking Water Quality Annual Report 2011/12
Appendix B –
summary of test
results
Perth Metropolitan Region
• Health-related Tables 1 and 2
• Aesthetic Tables 3 and 4
Mid West Region
• Health-related Tables 5 and 6
• Aesthetic Tables 7 and 8
Goldfields and Agricultural Regions
• Health-related Tables 9 and 10
• Aesthetic Tables 11 and 12
South West Region
• Health-related Tables 13 and 14
• Aesthetic Tables 15 and 16
Great Southern Region
• Health-related Tables 17 and 18
• Aesthetic Tables 19 and 20
North West Region
• Health-related Tables 21 and 22
• Aesthetic Tables 23 and 24
48 Drinking Water Quality Annual Report 2011/12
Appendix C –
list of all sampling
parameters
This appendix lists all constituents for which we routinely sample. Additional information is
available by telephoning us on 13 13 75.
Microbiological
Naegleria tolerant to >42°C
Escherichia coli
Physical Characteristics
Alkalinity
Conductivity
Filterable Organic Carbon
Hardness (Ca, Mg)
pH
Total dissolved solids (calculated)
True colour
Turbidity
Inorganic Chemicals
Aluminium (acid-soluble)
Ammonia – in chloraminated
supplies
Antimony
Arsenic
Barium
Beryllium
Boron
Bromide
Cadmium
Chloride
Chromium (as Cr(Total))
Copper
Cyanide
Fluoride
Iodide
Iron
Lead
Magnesium
Manganese
Mercury
Molybdenum
Nickel
Nitrate / Nitrite
Potassium
Selenium
Silica
Silver
Sodium
Sulphate
Uranium
Zinc
Organic Compounds
1,1,1-Trichloroethane
Acrylamide – only if
polyelectrolytes in use
BETX (Benzene, Ethylbenzene,
Toluene, Xylene)
Chlorobenzene
Dichlorobenzene
1,2-dichlorobenzene (1,2-DCB)
1,3-dichlorobenzene (1,3-DCB)
1,4-dichlorobenzene (1,4-DCB)
Dichloroethanes
1,2-dichloroethane
1,1-dichloroethane
Dichloroethenes
1,1-dichloroethene (1,1-DCE)
1,2-dichloroethene (1,2-DCE)
Dichloromethane
Disinfection By-products
Epichlorohydrin – only if resins in
use
Ethylenediamine tetraacetic
(EDTA)
Hexachlorobutadiene
Nitrilotriacetic acid (NTA)
Organotins
dialkyltins
tributyltin oxide
Plasticisers
di(2-ethylhexyl) phthalate (DEHP)
di(2-ethylhexyl) adipate (DEHA)
Polycyclic aromatic hydrocarbons
Styrene (vinylbenzene)
Tetrachloroethene
Trichlorobenzenes (total)
Trichloroethylene (TCE)
Vinyl chloride
49 Drinking Water Quality Annual Report 2011/12
Pesticides
2,4,5-T
2,4-D
Aldrin
Amitraz.
Atrazine
BHCs (including Lindane)
Bromophos Ethyl
Chlordane
Chlorpyrifos
DDD
DDE
DDT
Diazinon Dicamba
Dichlofop Methyl
Dieldrin
Dimethoate
Diuron
Endosulphan I
Endosulphan II
Endosulphan Sulphate
Ethion
Fenamiphos
Fenitrothion
Fluometuron
HCB
Heptachlor
Heptachlor Epoxide
Malathion
MCPA
Molinate
Oxychlordane
Parathion Ethyl
Parathion Methyl
Prometryn
Propazine
Simazine
Terbutryn
Triclopyr
Trifluralin (dinitroaniline
compound)
Radiological
Radium 226 & 228
Radon 222
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 1
Perth Region
Locality
Armadale/Kelmscott
Bold Park
Buckland Hill
Dwellingup
Foothills
Greenmount
Greenmount/Darlington
Hamilton Hill
Hills Direct
Lexia
Mandurah
Melville
Mirrabooka
Mt. Eliza
Mt. Hawthorn
Mt. Yokine
Mundaring
Neerabup
North Dandalup
Pinjarra
South Perth/Kewdale
Tamworth Hill
Thomsons Lake
Two Rocks
Wanneroo
West Yokine
Whitfords
Yanchep
Samples
Taken
Health related variables
E. coli
Samples
with
Max
>0
cfu/100mL
234
234
104
13
143
143
117
208
597
117
352
169
261
417
157
442
111
208
13
52
419
338
221
104
392
221
144
104
(1) No samples required
Table 2
Armadale/Kelmscott
Bold Park
Buckland Hill
Dwellingup
Foothills
Greenmount
Greenmount/Darlington
Hamilton Hill
Hills Direct
Lexia
Mandurah
Melville
Mirrabooka
Mt. Eliza
Mt. Hawthorn
Mt. Yokine
Mundaring
Neerabup
North Dandalup
Pinjarra
South Perth/Kewdale
Tamworth Hill
Thomsons Lake
Two Rocks
Wanneroo
West Yokine
Whitfords
Yanchep
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
in this 12 month period.
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
234
130
78
7
143
104
91
91
300
53
312
91
118
131
79
182
111
117
7
52
224
143
78
39
144
130
65
52
Nitrate
Samples
Taken
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Fluoride
Hydrocarbons
Concentration (mg/L)
Samples
Taken
Min
52
52
52
2
52
52
52
52
52
53
58
52
52
52
52
52
52
52
4
56
52
51
52
2
52
52
52
2
Max
0.55
0.45
0.50
<0.1
0.75
0.75
0.75
0.70
<0.1
0.40
0.10
0.70
0.70
0.45
0.75
0.75
0.75
0.70
0.65
0.20
0.60
0.10
0.65
0.15
0.70
0.70
0.70
<0.1
Samples
Taken
Mean
0.95
0.90
0.95
<0.1
0.90
0.95
0.95
0.90
1.00
1.00
0.95
0.90
1.00
0.90
0.90
0.90
1.00
1.00
1.10
0.95
0.95
1.00
0.95
0.15
0.90
0.95
0.90
<0.1
0.83
0.80
0.78
<0.1
0.84
0.84
0.83
0.80
0.81
0.81
0.84
0.78
0.84
0.80
0.83
0.83
0.86
0.89
0.88
0.83
0.83
0.84
0.79
0.15
0.80
0.83
0.80
<0.1
Metals
Guideline
Met
0
0
0
2
0
0
0
0
2
0
0
0
0
0
0
0
0
1
0
0
0
0
0
2
0
0
0
0
Samples
Taken
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
Guideline
Met
2
2
2
6
2
2
2
2
4
2
6
2
2
2
2
2
2
6
2
2
2
2
2
2
6
5
2
2
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Health related variables
Perth Region
Locality
Requirement
Met
Thermophilic Naegleria
Samples
Samples
with
Requirement
Taken
Thermophilic
Met
Pesticides
Concentration (mg/L)
Min
Max
Mean
4
<0.05
<0.05
<0.05
4
<0.05
0.1
<0.05
4
<0.05
0.1
<0.05
5
0.3
1
0.6
4
0.3
0.5
0.5
4
0.1
0.4
0.2
4
0.1
0.4
0.3
4
<0.05
0.1
<0.05
9
<0.05
0.4
0.1
4
0.1
1.3
0.7
12
<0.05
0.1
<0.05
4
<0.05
0.1
0.1
4
0.2
0.3
0.3
5
<0.05
0.1
<0.05
4
0.2
0.5
0.4
4
0.1
0.4
0.3
4
0.1
0.2
0.1
4
1.9
2.4
2.2
4
<0.05
0.2
0.1
4
<0.05
<0.05
<0.05
5
0.2
0.6
0.4
4
<0.05
<0.05
<0.05
4
<0.05
<0.05
<0.05
4
0.9
1.1
1
5
0.6
1.4
0.8
4
0.2
0.4
0.3
5
0.5
0.8
0.7
5
0.8
1.1
1
(1) No samples required in this 12 month period.
Guideline
Met
Samples
Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Radiological
Guideline
Met
4
1
1
5
1
1
1
1
9
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Samples
Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Trihalomethanes
Guideline
Met
0
0
0
1
1
0
0
1
0
0
3
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
(1)
(1)
(1)
ü
ü
(1)
(1)
ü
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Samples
Taken
13
13
13
2
26
18
13
13
26
13
12
14
13
5
13
13
13
13
4
2
26
26
14
13
17
13
13
5
Other Health Related
Concentration (mg/L)
Min
0.033
0.049
0.038
0.021
0.003
0.096
0.066
0.024
<0.001
0.090
0.010
0.043
0.093
0.032
0.084
0.050
0.013
0.031
0.043
0.015
0.074
<0.001
0.016
0.003
0.056
0.120
0.071
<0.001
Max
0.130
0.150
0.160
0.034
0.180
0.190
0.130
0.170
0.120
0.190
0.093
0.190
0.150
0.120
0.170
0.150
0.045
0.078
0.140
0.029
0.170
0.140
0.200
0.026
0.130
0.190
0.170
0.005
Mean
0.084
0.088
0.101
0.028
0.079
0.140
0.098
0.060
0.056
0.129
0.041
0.104
0.113
0.072
0.123
0.104
0.028
0.048
0.103
0.022
0.121
0.035
0.069
0.013
0.095
0.151
0.108
0.002
Guideline
Met
Samples
Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Requirement
Met
0
0
0
2
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 3
Aesthetic (Non-health related) Variables
Perth Region
Aluminium
Hardness
Iron
Manganese
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Locality
Samples Taken
Armadale/Kelmscott
Bold Park
Buckland Hill
Dwellingup
Foothills
Greenmount
Greenmount/Darlington
Hamilton Hill
Hills Direct
Lexia
Mandurah
Melville
Mirrabooka
Mt. Eliza
Mt. Hawthorn
Mt. Yokine
Mundaring
Neerabup
North Dandalup
Pinjarra
South Perth/Kewdale
Tamworth Hill
Thomsons Lake
Two Rocks
Wanneroo
West Yokine
Whitfords
Yanchep
4
0.014
0.030
0.022
ü
4
0.018
0.030
0.023
ü
4
0.016
0.025
0.019
ü
5
0.080
0.380
0.177
ü
4
0.020
0.025
0.024
ü
4
0.010
0.035
0.021
ü
4
0.018
0.025
0.021
ü
4
0.020
0.025
0.021
ü
9
<0.008
0.160
0.040
ü
4
0.025
0.050
0.038
ü
12
0.020
0.055
0.042
ü
4
0.020
0.070
0.035
ü
4
0.020
0.035
0.029
ü
5
0.012
0.025
0.018
ü
4
0.018
0.025
0.020
ü
4
0.014
0.025
0.017
ü
4
0.018
0.025
0.021
ü
4
0.020
0.070
0.045
ü
4
0.014
0.060
0.030
ü
4
0.014
0.080
0.048
ü
5
0.016
0.020
0.018
ü
4
0.014
0.060
0.039
ü
4
0.016
0.040
0.024
ü
4
<0.008
0.008
<0.008
ü
5
0.020
0.035
0.029
ü
4
0.016
0.025
0.020
ü
5
0.025
0.035
0.030
ü
5
<0.008
0.010
<0.008
ü
(1) Elevated hardness is characteristic of the source supplying this locality.
Min
Max
Table 4
Armadale/Kelmscott
Bold Park
Buckland Hill
Dwellingup
Foothills
Greenmount
Greenmount/Darlington
Hamilton Hill
Hills Direct
Lexia
Mandurah
Melville
Mirrabooka
Mt. Eliza
Mt. Hawthorn
Mt. Yokine
Mundaring
Neerabup
North Dandalup
Pinjarra
South Perth/Kewdale
Tamworth Hill
Thomsons Lake
Two Rocks
Wanneroo
West Yokine
Whitfords
Yanchep
Guideline Met
Samples Taken
Min
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Max
55
50
60
30
95
90
85
80
30
120
40
70
120
55
110
100
100
150
35
35
90
45
50
220
120
100
110
200
Mean
55
80
75
35
120
120
110
80
110
190
70
75
130
75
130
120
110
190
45
65
120
65
140
230
130
120
120
210
Guideline Met
55
65
69
32
105
103
101
80
71
143
59
74
128
67
118
113
105
173
41
54
105
55
91
225
124
115
114
208
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
(1)
Samples Taken
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Min
Max
0.020
0.030
0.035
0.010
0.045
0.006
0.020
0.008
0.008
0.004
0.008
0.020
0.008
0.020
0.035
0.015
0.015
0.008
0.060
0.006
0.020
<0.003
<0.003
<0.003
0.008
0.035
0.006
<0.003
Mean
0.060
0.100
0.070
0.120
0.090
0.060
0.060
0.020
0.240
0.015
0.040
0.200
0.015
0.080
0.100
0.140
0.025
0.030
0.200
0.050
0.080
0.045
0.030
<0.003
0.015
0.240
0.010
<0.003
Guideline Met
0.039
0.060
0.054
0.060
0.061
0.031
0.048
0.012
0.073
0.011
0.023
0.074
0.012
0.047
0.076
0.058
0.020
0.022
0.113
0.030
0.053
0.014
0.011
<0.003
0.011
0.101
0.008
<0.003
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Min
Max
<0.002
0.003
0.005
<0.002
0.004
<0.002
0.003
0.005
<0.002
<0.002
<0.002
0.003
<0.002
0.002
0.004
<0.002
0.004
<0.002
<0.002
<0.002
0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.002
0.005
0.010
0.008
0.005
0.004
0.004
0.005
0.016
0.008
0.004
0.045
0.002
0.020
0.007
0.009
0.009
0.003
0.008
<0.002
0.008
0.004
0.020
<0.002
0.003
0.012
0.003
<0.002
Mean
<0.002
0.004
0.008
0.003
0.004
<0.002
0.004
0.005
0.005
0.003
<0.002
0.015
<0.002
0.009
0.005
0.003
0.007
<0.002
0.004
<0.002
0.004
<0.002
0.008
<0.002
<0.002
0.005
<0.002
<0.002
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Aesthetic (Non-health related) Variables
Perth Region
Locality
Mean
Samples Taken
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Min
pH
TDS
True Colour
Value (pH units)
Concentration (mg/L)
Value (TCU)
Max
7.36
7.84
7.88
7.14
7.87
8.13
8.13
7.98
6.89
7.44
7.70
7.94
7.08
7.74
7.70
7.69
7.91
7.75
7.41
7.61
7.72
7.74
7.86
7.51
7.45
7.77
7.79
7.69
Mean
7.62
8.08
8.05
7.48
8.08
8.34
8.29
8.10
8.28
8.22
8.38
8.05
7.43
8.12
7.91
7.85
8.10
8.00
9.29
8.65
8.02
8.52
8.11
7.77
7.85
8.00
8.22
7.84
7.52
8.00
7.96
7.34
7.94
8.27
8.23
8.05
7.76
7.83
8.22
7.99
7.25
7.96
7.82
7.77
8.00
7.89
8.49
8.17
7.87
8.18
7.96
7.65
7.63
7.91
7.98
7.76
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Min
Max
222
260
394
168
450
401
379
313
137
380
126
264
505
363
537
452
461
471
165
125
412
130
166
503
435
511
453
447
Mean
251
354
548
231
538
549
524
356
466
494
281
499
546
602
565
562
525
513
181
203
556
217
555
517
512
575
492
488
Guideline Met
238
313
494
201
506
482
471
336
272
444
177
390
525
486
554
522
492
492
172
163
491
156
366
511
475
547
475
473
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Min
Max
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
Turbidity
Value (NTU)
Mean
<1
1
<1
3
<1
<1
<1
<1
3
3
2
<1
<1
<1
<1
<1
2
<1
3
3
<1
<1
<1
<1
<1
<1
<1
<1
Guideline Met
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
4
4
5
4
4
4
4
9
4
12
4
4
5
4
4
4
4
4
4
5
4
4
4
5
4
5
5
Min
Max
0.2
0.1
0.2
0.1
0.2
<0.1
0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.1
<0.1
0.3
0.2
0.3
<0.1
0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.5
0.4
0.4
1
0.3
0.1
0.2
0.2
2.2
0.2
0.4
0.2
0.2
0.4
0.3
0.3
0.9
0.4
1.6
0.5
0.2
0.3
0.2
<0.1
0.2
0.4
0.2
0.2
Mean
0.3
0.2
0.3
0.5
0.2
<0.1
0.2
<0.1
0.5
<0.1
0.2
<0.1
<0.1
0.2
0.2
<0.1
0.6
0.3
0.8
0.3
0.2
<0.1
0.2
<0.1
<0.1
<0.1
<0.1
<0.1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 5
Mid West
Health related variables
E. coli
Samples with
>0 cfu/100mL
Locality
Samples Taken
Badgingarra
Bindoon /Chittering
Bolgart
Calingiri
Carnamah
Carnarvon
Cervantes
Coomberdale
Coorow
Coral Bay
Cue
Dandaragan
Denham
Dongara/Denison
Eneabba
Exmouth
Gascoyne Junction
Geraldton
Gingin
Greenhead
Guilderton
Horrocks
Jurien Bay
Kalbarri
Lancelin
Latham
Ledge Point
Leeman
Meekatharra
Mingenew
Moora
Morawa
Mt Magnet
Mullewa
Nabawa
New Norcia
Nilgen (Ocean Farms)
Northampton
Perenjori
Piawaning
Port Kalbarri
Sandstone
Seabird
Seaview Park
Sovereign Hills
Three Springs
Watheroo
Wiluna
Woodridge
Yalgoo
Yerecoin
Yuna
13
51
13
13
13
65
52
11
13
13
12
13
51
49
13
65
13
182
52
51
52
14
52
51
52
13
52
51
51
12
52
52
51
13
13
13
13
52
13
13
13
12
13
13
26
13
13
13
13
13
12
13
(1) No samples required
Max cfu/100mL
Thermophilic Naegleria
Requirement
Met
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
<1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
<1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
<1
0
0
in this 12 month period
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
9
18
9
9
13
39
9
8
13
13
12
9
26
25
13
39
13
182
18
12
18
12
9
25
18
13
9
12
13
12
18
13
12
13
13
9
9
13
13
9
13
12
9
9
18
13
9
13
9
13
8
13
Samples with
Thermophilic
Naegleria
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Fluoride
Requirement
Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Hydrocarbons
Metals
Concentration (mg/L)
Samples Taken
2
2
2
2
2
5
2
2
2
1
2
2
2
2
2
54
2
50
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
2
2
2
2
2
2
2
2
2
2
2
2
2
Min
Max
<0.1
0.35
0.20
<0.1
<0.1
0.45
0.15
<0.1
<0.1
<0.1
0.30
0.25
<0.1
0.40
0.15
0.15
<0.1
0.55
<0.1
<0.1
0.20
0.35
0.25
0.10
0.20
<0.1
0.15
<0.1
0.55
0.10
<0.1
<0.1
0.25
0.70
0.75
0.20
<0.1
0.80
<0.1
<0.1
0.15
0.40
0.25
<0.1
<0.1
<0.1
<0.1
0.25
0.25
0.15
<0.1
0.75
<0.1
0.35
0.20
<0.1
<0.1
0.65
0.20
<0.1
<0.1
<0.1
0.30
0.30
<0.1
0.40
0.20
0.80
0.55
0.95
<0.1
0.10
0.25
0.35
0.30
0.15
0.30
<0.1
0.25
<0.1
0.60
0.20
<0.1
<0.1
0.35
0.80
0.80
0.20
<0.1
0.80
<0.1
<0.1
0.15
0.40
0.25
<0.1
<0.1
0.15
<0.1
0.30
0.35
0.20
<0.1
0.80
Mean
<0.1
0.35
0.20
<0.1
<0.1
0.56
0.18
<0.1
<0.1
<0.1
0.30
0.28
<0.1
0.40
0.18
0.64
0.28
0.79
<0.1
<0.1
0.23
0.35
0.28
0.13
0.25
<0.1
0.20
<0.1
0.58
0.15
<0.1
<0.1
0.30
0.75
0.78
0.20
<0.1
0.80
<0.1
<0.1
0.15
0.40
0.25
<0.1
<0.1
<0.1
<0.1
0.28
0.30
0.18
<0.1
0.78
Samples Taken
0
1
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
Guideline Met
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
Samples Taken
2
2
2
2
2
6
2
2
2
2
2
2
2
2
7
2
2
4
3
2
2
2
2
2
2
2
6
2
15
2
2
2
6
7
2
2
6
2
1
2
2
10
2
6
6
2
2
2
2
2
2
2
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 6
Health related variables
Mid West
Nitrate
Pesticides
Radiological
Trihalomethanes
Concentration (mg/L)
Locality
Badgingarra
Bindoon /Chittering
Bolgart
Calingiri
Carnamah
Carnarvon
Cervantes
Coomberdale
Coorow
Coral Bay
Cue
Dandaragan
Denham
Dongara/Denison
Eneabba
Exmouth
Gascoyne Junction
Geraldton
Gingin
Greenhead
Guilderton
Horrocks
Jurien Bay
Kalbarri
Lancelin
Latham
Ledge Point
Leeman
Meekatharra
Mingenew
Moora
Morawa
Mt Magnet
Mullewa
Nabawa
New Norcia
Nilgen (Ocean Farms)
Northampton
Perenjori
Piawaning
Port Kalbarri
Sandstone
Seabird
Seaview Park
Sovereign Hills
Three Springs
Watheroo
Wiluna
Woodridge
Yalgoo
Yerecoin
Yuna
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
6
4
6
4
6
4
1
4
2
4
2
6
5
2
4
2
4
4
1
5
Min
0.2
<0.05
7.6
2.9
0.2
0.8
2.7
<0.05
0.2
<0.05
11.2
<0.05
0.1
1.5
<0.05
1.7
<0.05
0.6
<0.05
0.8
6.8
<0.05
2.7
0.7
0.7
0.1
4.3
0.9
13.5
1.2
<0.05
0.2
15.2
0.6
0.5
10.9
4.3
0.6
0.1
7.1
0.1
10.1
0.1
4.2
3.4
0.3
<0.05
10.9
<0.05
17.8
9.3
0.5
Max
0.2
<0.05
7.9
6.1
0.2
0.8
3.1
<0.05
0.2
<0.05
11.5
<0.05
0.2
3
<0.05
2
<0.05
0.7
<0.05
0.9
8.2
<0.05
3
0.7
0.7
0.2
4.4
0.9
14.8
1.5
<0.05
0.2
16.5
0.7
0.7
12.1
4.6
0.7
0.1
10.7
0.1
12.4
0.1
4.8
5.2
0.4
<0.05
14
0.1
18.9
9.3
0.7
Other Health Related
Concentration (mg/L)
Mean
0.2
<0.05
7.8
4.4
0.2
0.8
2.9
<0.05
0.2
<0.05
11.4
<0.05
0.2
2.6
<0.05
1.8
<0.05
0.6
<0.05
0.8
7.5
<0.05
2.9
0.7
0.7
0.2
4.4
0.9
14.1
1.4
<0.05
0.2
15.9
0.6
0.6
11.4
4.5
0.6
0.1
9.3
0.1
11.5
0.1
4.6
4.5
0.3
<0.05
12.5
<0.05
18.6
9.3
0.6
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(2)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(2)
ü
ü
ü
(2)
ü
ü
(2)
ü
ü
ü
ü
ü
(2)
ü
ü
ü
ü
ü
(2)
ü
(2)
ü
ü
Samples Taken
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
4
1
1
1
1
1
1
1
1
1
1
0
1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
1
1
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
0
0
4
0
0
0
0
0
4
1
0
0
1
0
0
3
0
0
0
0
0
0
0
1
0
0
0
1
0
Guideline Met
(1)
ü
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
ü
ü
(1)
(1)
ü
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
ü
(1)
Samples Taken
2
2
2
2
2
2
2
2
2
1
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
1
2
2
2
2
2
2
2
2
2
2
2
1
2
Min
<0.001
0.021
<0.001
0.009
0.006
<0.001
0.014
0.030
0.012
0.150
<0.001
0.003
0.015
0.009
0.006
0.002
0.002
0.010
<0.001
<0.001
0.010
0.009
0.004
<0.001
0.006
<0.001
0.013
<0.001
<0.001
<0.001
0.015
<0.001
0.006
0.024
0.008
0.005
0.002
0.018
0.008
0.056
0.001
0.002
0.029
0.004
0.017
<0.001
0.120
<0.001
0.082
0.002
0.071
0.014
Max
<0.001
0.021
0.005
0.013
0.010
0.004
0.015
0.045
0.013
0.150
0.005
0.007
0.043
0.010
0.010
0.002
0.071
0.015
<0.001
0.004
0.018
0.010
0.008
<0.001
0.012
<0.001
0.014
0.007
0.002
0.003
0.027
0.005
0.008
0.026
0.014
0.013
0.003
0.021
0.008
0.062
0.006
0.006
0.029
0.005
0.019
0.004
0.200
0.004
0.086
0.010
0.071
0.021
Mean
<0.001
0.021
0.003
0.011
0.008
0.002
0.015
0.038
0.013
0.150
0.003
0.005
0.029
0.010
0.008
0.002
0.037
0.012
<0.001
0.002
0.014
0.010
0.006
<0.001
0.009
<0.001
0.014
0.004
<0.001
0.002
0.021
0.003
0.007
0.025
0.011
0.009
0.003
0.020
0.008
0.059
0.004
0.004
0.029
0.005
0.018
0.002
0.160
0.002
0.084
0.006
0.071
0.018
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
1
0
0
0
2
0
0
0
1
0
Requirement
Met
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
ü
(1)
(1)
(1)
ü
(1)
(1) No samples required in this 12 month period. 2) Cue, Meekatharra, Mount Magnet, New Norcia, Sandstone, Wiluna and Yalgoo have been granted an exemption from compliance with the nitrate guideline by the Department of Health.
The water supplied is safe for adults and children over the age of 3 months. Carers of infants younger than 3 months should seek advice from the Community Health Nurse regarding the use of alternative water sources for the preparation of
bottle feeds. The Water Corporation provides bottled water free of charge for this purpose.
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 7
Aesthetic (Non-health related) Variables
Mid West
Locality
Badgingarra
Bindoon /Chittering
Bolgart
Calingiri
Carnamah
Carnarvon
Cervantes
Coomberdale
Coorow
Coral Bay
Cue
Dandaragan
Denham
Dongara/Denison
Eneabba
Exmouth
Gascoyne Junction
Geraldton
Gingin
Greenhead
Guilderton
Horrocks
Jurien Bay
Kalbarri
Lancelin
Latham
Ledge Point
Leeman
Meekatharra
Mingenew
Moora
Morawa
Mt Magnet
Mullewa
Nabawa
New Norcia
Nilgen (Ocean Farms)
Northampton
Perenjori
Piawaning
Port Kalbarri
Sandstone
Seabird
Seaview Park
Sovereign Hills
Three Springs
Watheroo
Wiluna
Woodridge
Yalgoo
Yerecoin
Yuna
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Aluminium
Hardness
Iron
Manganese
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Min
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.025
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.010
0.012
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.055
<0.008
<0.008
0.014
Max
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.008
0.030
<0.008
<0.008
<0.008
<0.008
0.025
<0.008
<0.008
0.008
<0.008
<0.008
<0.008
<0.008
0.012
<0.008
0.010
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.012
0.020
0.008
0.012
0.016
<0.008
0.012
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.008
<0.008
0.075
0.014
<0.008
0.020
Mean
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.028
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.009
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.011
0.016
<0.008
<0.008
0.009
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
<0.008
0.066
<0.008
<0.008
0.018
Guideline Met
Samples Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(1) Elevated hardness is characteristic of the source supplying this locality.
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Min
Max
40
50
110
80
130
160
310
70
130
40
180
90
50
110
95
320
45
110
30
100
260
130
290
60
280
85
250
100
260
75
60
70
240
120
110
160
270
130
70
95
110
310
95
190
210
80
230
110
50
310
110
110
Mean
45
55
120
220
130
180
320
70
130
40
190
95
65
120
100
360
280
120
30
100
310
140
350
60
280
90
260
110
290
80
65
70
270
150
120
180
270
130
70
110
110
340
95
190
220
90
250
250
65
330
110
120
Guideline Met
43
51
118
145
130
170
316
70
130
40
183
93
58
115
98
340
101
115
30
100
283
133
313
60
280
88
255
105
275
78
64
70
255
133
115
173
270
130
70
103
110
333
95
190
215
85
243
180
58
323
110
116
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
ü
(1)
ü
(1)
ü
(1)
ü
(1)
ü
(1)
ü
ü
ü
(1)
ü
ü
ü
(1)
ü
ü
ü
ü
(1)
ü
ü
(1)
ü
(1)
ü
ü
(1)
ü
ü
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Min
0.008
0.090
0.015
0.020
0.025
<0.003
<0.003
0.200
0.015
0.015
<0.003
0.050
0.030
0.008
0.015
<0.003
<0.003
0.015
0.090
0.015
<0.003
0.090
<0.003
0.008
<0.003
0.020
<0.003
0.015
<0.003
0.006
0.035
0.010
<0.003
0.015
0.025
0.015
<0.003
0.020
0.025
0.050
0.010
<0.003
0.020
<0.003
<0.003
0.060
0.015
<0.003
0.015
<0.003
0.080
0.040
Max
0.010
0.260
0.025
0.070
0.025
<0.003
0.008
0.300
0.030
0.015
0.004
0.760
0.120
0.035
0.035
<0.003
0.004
0.050
0.180
0.030
0.006
0.600
<0.003
0.015
<0.003
0.045
<0.003
0.015
0.004
0.025
0.240
0.010
<0.003
0.035
0.035
0.030
<0.003
0.260
0.025
0.520
0.020
0.006
0.025
<0.003
0.004
0.060
0.025
<0.003
0.025
0.004
0.080
0.160
Mean
0.009
0.168
0.019
0.036
0.025
<0.003
<0.003
0.250
0.023
0.015
<0.003
0.240
0.072
0.022
0.025
<0.003
<0.003
0.030
0.115
0.023
<0.003
0.265
<0.003
0.012
<0.003
0.033
<0.003
0.015
<0.003
0.016
0.124
0.010
<0.003
0.025
0.030
0.024
<0.003
0.083
0.025
0.253
0.015
<0.003
0.023
<0.003
<0.003
0.060
0.021
<0.003
0.020
<0.003
0.080
0.070
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Min
0.003
0.003
<0.002
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
0.003
<0.002
0.003
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
<0.002
<0.002
<0.002
0.005
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.006
<0.002
<0.002
0.003
<0.002
<0.002
<0.002
Max
0.004
0.006
<0.002
<0.002
<0.002
<0.002
<0.002
0.007
<0.002
0.003
<0.002
0.035
<0.002
0.003
<0.002
<0.002
0.018
<0.002
0.003
<0.002
<0.002
0.035
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.006
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.016
<0.002
<0.002
0.002
<0.002
<0.002
<0.002
<0.002
0.010
<0.002
<0.002
0.006
<0.002
<0.002
0.006
Mean
0.004
0.005
<0.002
<0.002
<0.002
<0.002
<0.002
0.006
<0.002
0.003
<0.002
0.012
<0.002
<0.002
<0.002
<0.002
0.010
<0.002
<0.002
<0.002
<0.002
0.016
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.003
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.008
<0.002
<0.002
0.004
<0.002
<0.002
<0.002
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 8
Aesthetic (Non-health related) Variables
Mid West
Locality
Badgingarra
Bindoon /Chittering
Bolgart
Calingiri
Carnamah
Carnarvon
Cervantes
Coomberdale
Coorow
Coral Bay
Cue
Dandaragan
Denham
Dongara/Denison
Eneabba
Exmouth
Gascoyne Junction
Geraldton
Gingin
Greenhead
Guilderton
Horrocks
Jurien Bay
Kalbarri
Lancelin
Latham
Ledge Point
Leeman
Meekatharra
Mingenew
Moora
Morawa
Mt Magnet
Mullewa
Nabawa
New Norcia
Nilgen (Ocean Farms)
Northampton
Perenjori
Piawaning
Port Kalbarri
Sandstone
Seabird
Seaview Park
Sovereign Hills
Three Springs
Watheroo
Wiluna
Woodridge
Yalgoo
Yerecoin
Yuna
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
7
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
7
4
2
2
2
2
4
2
4
4
1
5
Min
pH
TDS
True Colour
Value (pH units)
Concentration (mg/L)
Value (TCU)
Max
6.95
7.37
6.88
6.55
6.66
7.69
7.60
8.93
7.01
7.62
7.69
6.98
7.42
7.18
7.10
7.44
6.94
7.03
7.48
7.09
7.80
6.21
7.45
6.48
7.77
8.89
7.77
7.47
8.00
7.01
6.40
6.96
8.00
7.79
7.57
6.32
7.66
7.92
7.39
7.26
6.93
7.17
7.93
7.86
8.01
7.39
7.42
8.03
7.66
7.68
7.47
7.54
Mean
7.20
7.73
7.26
7.10
6.89
7.79
7.87
9.03
7.14
7.62
7.90
7.36
7.51
7.44
7.26
7.70
7.50
7.56
7.82
7.46
7.95
6.54
8.03
6.83
7.89
9.02
7.96
7.50
8.18
7.30
7.40
6.96
8.08
8.28
7.82
6.75
7.67
8.43
7.39
7.50
7.84
7.52
7.95
8.00
8.07
7.63
7.68
8.20
8.43
7.87
7.47
7.85
7.08
7.48
7.07
6.80
6.78
7.74
7.74
8.98
7.08
7.62
7.82
7.16
7.48
7.31
7.18
7.57
7.14
7.21
7.58
7.28
7.87
6.34
7.77
6.65
7.83
8.96
7.87
7.49
8.10
7.16
6.85
6.96
8.04
8.07
7.70
6.57
7.67
8.08
7.39
7.38
7.37
7.35
7.94
7.93
8.04
7.51
7.56
8.12
7.91
7.79
7.47
7.71
Guideline Met
ü
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(2)
ü
ü
ü
(3)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Min
608
462
563
473
812
508
882
483
831
155
786
671
433
852
638
849
162
775
265
586
708
1168
739
379
668
640
673
562
1010
686
467
616
907
862
791
809
710
852
633
308
730
965
543
483
598
705
548
453
471
1028
354
798
Max
634
482
610
1104
828
586
982
518
847
155
832
699
485
901
659
905
811
866
343
591
961
1182
1057
388
685
664
702
593
1071
689
504
616
962
921
851
918
724
869
633
344
804
1026
553
510
615
743
567
663
485
1052
354
873
Mean
621
470
596
757
820
547
940
501
839
155
813
689
454
876
649
873
329
828
300
589
834
1174
869
384
677
652
688
578
1046
688
490
616
935
885
821
867
717
863
633
325
767
1009
548
497
607
724
558
558
476
1040
354
838
Guideline Met
(4)
ü
ü
(4)
(4)
ü
(4)
ü
(4)
ü
(4)
(4)
ü
(4)
(4)
(4)
ü
(4)
ü
ü
(4)
(4)
(4)
ü
(4)
(4)
(4)
ü
(4)
(4)
ü
(4)
(4)
(4)
(4)
(4)
(4)
(4)
(4)
ü
(4)
(4)
ü
ü
(4)
(4)
ü
ü
ü
(4)
ü
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Min
Max
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
Turbidity
Value (NTU)
Mean
<1
<1
<1
<1
<1
<1
<1
1
1
<1
<1
<1
<1
<1
<1
<1
<1
<1
2
<1
<1
<1
<1
<1
<1
1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
2
<1
<1
<1
<1
<1
Guideline Met
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
2
4
4
4
2
2
5
2
2
1
4
4
5
4
4
4
6
4
4
2
4
4
4
2
2
2
2
2
4
2
4
1
2
4
2
4
2
4
1
4
2
4
2
2
2
2
4
2
4
4
1
5
Min
Max
0.1
0.1
0.5
<0.1
<0.1
<0.1
<0.1
0.3
<0.1
<0.1
<0.1
0.2
<0.1
<0.1
<0.1
<0.1
<0.1
0.1
0.1
<0.1
<0.1
0.3
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.1
<0.1
<0.1
<0.1
0.1
0.7
<0.1
0.2
<0.1
0.1
<0.1
<0.1
0.2
<0.1
<0.1
0.1
<0.1
<0.1
<0.1
<0.1
0.1
0.2
0.2
0.3
0.8
0.3
<0.1
<0.1
0.2
0.5
<0.1
<0.1
<0.1
1.4
<0.1
0.2
0.2
0.2
0.4
0.8
0.2
<0.1
<0.1
1.9
<0.1
<0.1
<0.1
0.2
<0.1
<0.1
<0.1
<0.1
0.2
<0.1
<0.1
0.1
0.3
1.3
<0.1
0.5
<0.1
0.4
<0.1
<0.1
0.3
<0.1
0.1
0.3
0.1
<0.1
0.1
<0.1
0.1
1.5
Mean
0.2
0.2
0.6
0.2
<0.1
<0.1
<0.1
0.4
<0.1
<0.1
<0.1
0.5
<0.1
<0.1
<0.1
<0.1
0.2
0.4
0.2
<0.1
<0.1
0.8
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.1
<0.1
<0.1
<0.1
0.2
1
<0.1
0.3
<0.1
0.3
<0.1
<0.1
0.3
<0.1
<0.1
0.2
<0.1
<0.1
<0.1
<0.1
0.1
0.5
Guideline Met
(4)
(1) High pH is characteristic of the source supplying this locality. (2) Low pH is characteristic of the source supplying this community. (3) Elevated pH is caused by leaching of calcium carbonate from the protective cement lining of the pipes after long water transit times. (4) Elevated TDS is
characteristic of the source supplying this locality.
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Goldfields and
Agricultural
Table 9
Health related variables
E. coli
Samples with
>0 cfu/100mL
Locality
Samples Taken
Bakers Hill
Ballidu
Beacon
Bencubbin
Beverley
Bind Bindi
Broad Arrow
Bruce Rock
Bullfinch
Buntine
Cadoux
Condingup
Coolgardie
Corrigin
Cunderdin
Dalwallinu
Dowerin
Esperance
Gibson
Goomalling
Grass Patch
Grass Valley
Hopetoun
Kalannie
Kalgoorlie
Kambalda
Kellerberrin
Koolyanobbing
Koorda
Kununoppin
Laverton
Leonora
Marvel Loch
Meckering
Menzies
Merredin
Miling
Mukinbudin
Munglinup
Muntadgin
Narembeen
Norseman
Northam
Nungarin
Ora Banda
Pithara
Quairading
Ravensthorpe
Salmon Gums
Southern Cross
Tammin
Toodyay
Trayning
Warralakin
Westonia
Wongan Hills
Wubin
Wundowie
Wyalkatchem
York
52
12
12
12
52
12
12
52
12
12
12
12
52
52
52
52
12
91
12
12
12
12
48
12
136
52
52
12
12
12
12
51
12
12
11
52
12
12
16
12
12
50
65
12
11
12
52
12
12
51
24
52
12
12
12
52
12
52
12
52
(1) No samples required
Max cfu/100mL
Thermophilic Naegleria
Requirement
Met
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
in this 12 month period
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
12
12
11
12
26
12
12
12
9
12
12
8
26
26
13
13
12
61
8
12
8
12
24
12
136
52
26
12
12
12
8
17
12
12
8
52
12
12
6
12
12
24
65
12
11
12
26
6
8
26
24
26
12
12
12
26
12
12
12
52
Samples with
Thermophilic
Naegleria
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Fluoride
Requirement
Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Hydrocarbons
Metals
Concentration (mg/L)
Samples Taken
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
52
2
2
2
2
2
2
52
2
2
2
2
2
4
2
2
2
2
52
2
2
2
2
2
2
52
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
54
Min
Max
0.85
0.80
0.70
0.75
0.90
0.80
0.90
0.80
0.75
0.85
0.80
0.25
0.80
0.80
0.85
0.85
0.80
0.70
0.35
0.85
0.35
0.90
<0.1
0.80
0.75
0.90
0.85
0.75
0.80
0.85
0.90
0.65
0.80
0.90
0.70
0.75
0.75
0.70
<0.1
0.85
0.85
0.90
0.75
0.85
0.85
0.85
0.80
<0.1
0.70
0.75
0.85
0.80
0.80
0.80
0.75
0.80
0.85
0.75
0.80
0.75
0.90
0.85
0.90
0.85
0.95
0.85
0.90
0.85
0.80
0.85
0.90
0.30
0.95
0.90
0.85
0.90
0.90
0.90
0.35
0.85
0.40
0.95
<0.1
0.85
1.00
0.90
0.90
0.80
0.85
0.90
1.30
0.65
0.85
0.95
0.90
0.95
0.80
0.80
<0.1
0.85
0.95
0.95
1.00
0.90
0.95
0.90
0.80
<0.1
0.75
0.90
0.90
0.90
0.90
0.90
0.90
0.90
0.90
0.85
0.90
0.95
Mean
0.88
0.83
0.80
0.80
0.93
0.83
0.90
0.83
0.78
0.85
0.85
0.28
0.88
0.85
0.85
0.88
0.85
0.78
0.35
0.85
0.38
0.93
<0.1
0.83
0.88
0.90
0.88
0.78
0.83
0.88
1.08
0.65
0.83
0.93
0.80
0.87
0.78
0.75
<0.1
0.85
0.90
0.93
0.86
0.88
0.90
0.88
0.80
<0.1
0.73
0.83
0.88
0.85
0.85
0.85
0.83
0.85
0.88
0.80
0.85
0.86
Samples Taken
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
8
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Guideline Met
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Samples Taken
2
2
2
3
2
2
2
2
1
2
2
2
2
2
2
2
2
2
2
2
2
2
7
2
4
2
2
1
2
2
14
2
1
2
5
2
2
2
2
3
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Goldfields and
Agricultural
Table 10
Health related variables
Nitrate
Pesticides
Radiological
Trihalomethanes
Concentration (mg/L)
Locality
Bakers Hill
Ballidu
Beacon
Bencubbin
Beverley
Bind Bindi
Broad Arrow
Bruce Rock
Bullfinch
Buntine
Cadoux
Condingup
Coolgardie
Corrigin
Cunderdin
Dalwallinu
Dowerin
Esperance
Gibson
Goomalling
Grass Patch
Grass Valley
Hopetoun
Kalannie
Kalgoorlie
Kambalda
Kellerberrin
Koolyanobbing
Koorda
Kununoppin
Laverton
Leonora
Marvel Loch
Meckering
Menzies
Merredin
Miling
Mukinbudin
Munglinup
Muntadgin
Narembeen
Norseman
Northam
Nungarin
Ora Banda
Pithara
Quairading
Ravensthorpe
Salmon Gums
Southern Cross
Tammin
Toodyay
Trayning
Warralakin
Westonia
Wongan Hills
Wubin
Wundowie
Wyalkatchem
York
Samples Taken
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
6
4
2
4
2
4
2
4
1
2
2
2
2
4
10
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
Min
0.1
0.8
1
<0.05
0.2
1
0.4
0.5
1.1
1.5
0.3
0.2
0.3
0.4
0.2
0.9
0.3
2.2
2.5
0.2
<0.05
<0.05
<0.05
0.8
0.3
0.3
0.1
0.3
0.8
0.4
4.6
6.7
1.1
0.1
12.6
0.2
0.8
0.1
<0.05
0.2
0.3
0.3
0.2
0.2
0.4
0.9
0.5
<0.05
4.4
<0.05
0.2
0.4
0.5
0.3
0.3
0.3
1.4
0.1
0.4
0.1
Max
0.3
0.9
1.1
0.8
0.4
1.1
0.7
1
1.2
1.6
0.7
0.2
0.8
0.5
0.3
1
0.3
6.2
2.7
0.4
0.2
0.2
0.6
0.9
0.8
0.3
0.3
0.9
0.8
0.5
7.2
8.5
1.1
0.3
13.8
0.2
0.9
0.8
<0.05
0.7
0.4
0.4
0.2
0.3
0.9
1
0.8
0.2
5.8
0.4
0.3
0.5
0.5
1
0.5
0.4
2
0.2
0.7
0.3
Other Health Related
Concentration (mg/L)
Mean
0.2
0.9
1.1
0.4
0.3
1.1
0.5
0.7
1.2
1.6
0.5
0.2
0.6
0.4
0.2
0.9
0.3
4.3
2.6
0.3
0.1
0.1
0.4
0.9
0.5
0.3
0.2
0.6
0.8
0.5
6.4
7.6
1.1
0.2
13.2
0.2
0.8
0.5
<0.05
0.5
0.3
0.4
0.2
0.2
0.6
0.9
0.6
0.1
5.1
0.2
0.2
0.4
0.5
0.6
0.4
0.4
1.7
0.1
0.6
0.2
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(2)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
5
1
4
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
(3) 0
1
1
1
1
1
1
1
1
1
1
1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
Guideline Met
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
ü
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Samples Taken
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
14
2
2
2
2
2
2
2
2
2
2
2
2
2
3
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
Min
0.016
0.049
0.024
0.009
0.032
0.010
0.089
0.037
0.019
0.046
0.030
0.007
0.047
0.014
0.015
<0.001
0.006
0.036
0.020
0.015
0.094
0.037
0.010
0.032
0.050
0.080
0.018
0.015
0.011
0.006
0.056
<0.001
0.024
0.021
0.006
0.010
0.010
0.002
0.036
0.008
0.013
0.031
0.020
0.005
0.062
0.001
0.075
0.007
0.060
0.018
0.017
0.011
0.008
0.014
0.011
0.049
0.052
0.018
0.034
0.004
Max
0.023
0.067
0.029
0.140
0.034
0.094
0.110
0.078
0.037
0.079
0.047
0.012
0.061
0.015
0.017
0.002
0.011
0.064
0.023
0.016
0.098
0.037
0.011
0.044
0.130
0.080
0.023
0.032
0.013
0.028
0.063
<0.001
0.052
0.029
0.006
0.018
0.020
0.054
0.044
0.009
0.024
0.043
0.025
0.013
0.076
0.004
0.091
0.130
0.079
0.023
0.027
0.014
0.046
0.017
0.016
0.150
0.069
0.026
0.064
0.017
Mean
0.020
0.058
0.027
0.075
0.033
0.037
0.100
0.058
0.028
0.063
0.039
0.010
0.054
0.015
0.016
<0.001
0.009
0.050
0.022
0.016
0.096
0.037
0.011
0.038
0.087
0.080
0.021
0.024
0.012
0.017
0.060
<0.001
0.038
0.025
0.006
0.014
0.015
0.028
0.039
0.009
0.019
0.037
0.023
0.009
0.069
0.003
0.083
0.092
0.070
0.020
0.022
0.013
0.027
0.016
0.014
0.100
0.061
0.022
0.049
0.011
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Requirement
Met
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1) No samples required in this 12 month period. (2) Menzies has been granted an exemption from compliance with the nitrate guideline by the Department of Health. The water supplied is safe for adults and children over the age of 3 months.
Carers of infants younger than 3 months should seek advice from the Community Health Nurse regarding the use of alternative water sources for the preparation of bottle feeds. The Water Corporation provides bottled water free of charge for
this purpose. (3) Data are for 5 samples from the previous 5 years.
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Goldfields and
Agricultural
Locality
Bakers Hill
Ballidu
Beacon
Bencubbin
Beverley
Bind Bindi
Broad Arrow
Bruce Rock
Bullfinch
Buntine
Cadoux
Condingup
Coolgardie
Corrigin
Cunderdin
Dalwallinu
Dowerin
Esperance
Gibson
Goomalling
Grass Patch
Grass Valley
Hopetoun
Kalannie
Kalgoorlie
Kambalda
Kellerberrin
Koolyanobbing
Koorda
Kununoppin
Laverton
Leonora
Marvel Loch
Meckering
Menzies
Merredin
Miling
Mukinbudin
Munglinup
Muntadgin
Narembeen
Norseman
Northam
Nungarin
Ora Banda
Pithara
Quairading
Ravensthorpe
Salmon Gums
Southern Cross
Tammin
Toodyay
Trayning
Warralakin
Westonia
Wongan Hills
Wubin
Wundowie
Wyalkatchem
York
Table 11
Aesthetic (Non-health related) Variables
Samples Taken
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
4
2
4
2
4
2
4
1
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
Aluminium
Hardness
Iron
Manganese
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Min
0.012
0.012
0.010
0.018
0.008
0.012
0.020
0.012
<0.008
0.012
0.014
<0.008
0.014
0.008
0.014
0.014
0.012
<0.008
<0.008
0.018
0.025
0.014
<0.008
0.010
0.012
0.020
0.012
<0.008
0.012
0.008
<0.008
<0.008
<0.008
0.014
<0.008
0.010
0.010
0.025
0.012
0.012
0.014
0.010
0.018
0.012
0.010
0.010
<0.008
0.012
0.014
0.014
0.018
0.020
<0.008
0.012
0.020
0.010
0.010
0.016
0.012
0.010
Max
0.025
0.016
0.045
0.020
0.016
0.018
0.035
0.020
<0.008
0.025
0.020
<0.008
0.018
0.014
0.016
0.020
0.018
<0.008
<0.008
0.025
0.040
0.020
<0.008
0.020
0.025
0.020
0.020
0.010
0.012
0.016
<0.008
<0.008
0.016
0.016
<0.008
0.018
0.016
0.040
0.014
0.025
0.018
0.025
0.018
0.018
0.016
0.018
0.012
0.080
0.020
0.016
0.020
0.045
0.016
0.018
0.020
0.012
0.018
0.016
0.012
0.018
Mean
0.019
0.014
0.028
0.019
0.012
0.015
0.028
0.016
<0.008
0.019
0.017
<0.008
0.016
0.011
0.015
0.017
0.015
<0.008
<0.008
0.022
0.033
0.017
<0.008
0.015
0.020
0.020
0.016
<0.008
0.012
0.012
<0.008
<0.008
<0.008
0.015
<0.008
0.014
0.013
0.033
0.013
0.019
0.016
0.018
0.018
0.015
0.013
0.014
<0.008
0.049
0.017
0.015
0.019
0.033
<0.008
0.015
0.020
0.011
0.014
0.016
0.012
0.014
Guideline Met
Samples Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(1) Elevated hardness is characteristic of the source supplying this locality.
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
10
4
2
4
2
4
2
4
1
2
2
2
2
4
6
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
Min
Max
110
110
95
110
110
120
120
110
120
120
110
75
110
120
110
120
110
330
35
110
100
110
65
110
110
120
100
110
120
110
70
180
110
110
290
110
120
95
12
110
110
120
110
110
140
110
110
35
380
110
100
110
110
110
110
120
120
100
110
110
Mean
110
120
130
120
110
130
120
120
130
130
120
80
110
130
120
120
110
380
35
110
110
110
210
110
120
120
110
110
130
120
120
220
110
110
310
110
120
120
12
110
120
130
110
110
140
120
110
70
390
120
110
110
120
110
110
120
130
110
120
110
Guideline Met
110
115
113
115
110
125
120
115
125
125
115
76
110
125
115
120
110
355
35
110
105
110
134
110
118
120
105
110
125
115
103
197
110
110
300
110
120
108
12
110
115
125
110
110
140
115
110
54
385
115
105
110
115
110
110
120
125
105
115
110
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(1)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
6
4
2
4
2
4
2
4
1
2
2
2
2
4
6
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
Min
0.015
0.020
0.006
0.050
0.015
0.006
0.035
0.020
0.004
0.008
0.015
0.025
0.020
0.010
0.020
0.030
0.015
<0.003
0.045
0.020
0.004
0.015
<0.003
0.020
0.020
0.070
0.015
0.020
0.006
0.025
0.025
<0.003
0.035
0.020
<0.003
0.020
0.040
0.020
0.020
0.015
0.025
0.010
0.015
0.015
<0.003
0.006
0.015
0.070
<0.003
0.025
0.020
0.015
0.015
0.010
0.020
0.010
0.008
0.015
0.015
0.010
Max
0.020
0.030
0.060
0.120
0.015
0.040
0.080
0.025
0.004
0.008
0.060
0.070
0.025
0.020
0.025
0.090
0.025
0.006
0.050
0.025
0.060
0.015
0.050
0.090
0.025
0.070
0.030
0.030
0.025
0.045
0.090
<0.003
0.045
0.020
<0.003
0.020
0.045
0.060
0.120
0.025
0.030
0.045
0.020
0.020
0.010
0.015
0.030
0.080
<0.003
0.030
0.030
0.020
0.020
0.020
0.035
0.025
0.010
0.020
0.025
0.015
Mean
0.018
0.025
0.033
0.085
0.015
0.023
0.058
0.023
0.004
0.008
0.038
0.043
0.023
0.015
0.023
0.060
0.020
<0.003
0.049
0.023
0.030
0.015
0.016
0.055
0.021
0.070
0.023
0.025
0.016
0.035
0.050
<0.003
0.040
0.020
<0.003
0.020
0.043
0.040
0.070
0.020
0.028
0.028
0.018
0.018
0.005
0.011
0.023
0.073
<0.003
0.028
0.025
0.018
0.018
0.015
0.028
0.018
0.009
0.018
0.020
0.013
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
6
4
2
4
2
4
2
4
1
2
2
2
2
4
6
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
4
2
2
2
2
2
2
2
2
2
2
2
2
Min
0.003
<0.002
<0.002
0.005
0.002
<0.002
0.005
0.003
<0.002
<0.002
0.004
<0.002
0.002
<0.002
0.006
0.002
<0.002
<0.002
<0.002
0.003
<0.002
<0.002
<0.002
<0.002
0.003
0.014
0.005
0.002
<0.002
0.007
<0.002
<0.002
<0.002
0.004
<0.002
0.003
<0.002
0.004
<0.002
0.002
0.003
<0.002
0.005
0.003
<0.002
<0.002
<0.002
0.003
<0.002
0.003
0.005
0.003
0.003
<0.002
0.003
<0.002
<0.002
<0.002
0.002
0.003
Max
0.007
0.005
0.002
0.018
0.006
<0.002
0.006
0.006
<0.002
<0.002
0.010
<0.002
0.010
0.008
0.008
0.004
0.006
<0.002
<0.002
0.014
<0.002
0.012
<0.002
0.008
0.006
0.014
0.008
0.009
<0.002
0.009
<0.002
<0.002
0.007
0.008
<0.002
0.012
<0.002
0.004
0.005
0.009
0.007
0.005
0.009
0.008
<0.002
<0.002
0.004
0.009
<0.002
0.012
0.009
0.012
0.008
0.004
0.014
0.002
<0.002
0.012
0.005
0.008
Mean
0.005
0.003
<0.002
0.012
0.004
<0.002
0.006
0.005
<0.002
<0.002
0.007
<0.002
0.006
0.004
0.007
0.003
0.003
<0.002
<0.002
0.009
<0.002
0.006
<0.002
0.004
0.005
0.014
0.007
0.006
<0.002
0.008
<0.002
<0.002
0.004
0.006
<0.002
0.008
<0.002
0.004
0.003
0.006
0.005
0.003
0.007
0.006
<0.002
<0.002
<0.002
0.006
<0.002
0.008
0.007
0.008
0.006
<0.002
0.009
<0.002
<0.002
0.006
0.004
0.006
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Goldfields and
Agricultural
Table 12
Aesthetic (Non-health related) Variables
pH
TDS
True Colour
Value (pH units)
Concentration (mg/L)
Value (TCU)
Turbidity
Value (NTU)
Locality
Samples Taken
Bakers Hill
Ballidu
Beacon
Bencubbin
Beverley
Bind Bindi
Broad Arrow
Bruce Rock
Bullfinch
Buntine
Cadoux
Condingup
Coolgardie
Corrigin
Cunderdin
Dalwallinu
Dowerin
Esperance
Gibson
Goomalling
Grass Patch
Grass Valley
Hopetoun
Kalannie
Kalgoorlie
Kambalda
Kellerberrin
Koolyanobbing
Koorda
Kununoppin
Laverton
Leonora
Marvel Loch
Meckering
Menzies
Merredin
Miling
Mukinbudin
Munglinup
Muntadgin
Narembeen
Norseman
Northam
Nungarin
Ora Banda
Pithara
Quairading
Ravensthorpe
Salmon Gums
Southern Cross
Tammin
Toodyay
Trayning
Warralakin
Westonia
Wongan Hills
Wubin
Wundowie
Wyalkatchem
York
2
7.91
8.08
8.00
ü
2
484
509
497
ü
2
<1
2
<1
ü
2
0.3
0.5
0.4
2
7.15
8.35
7.75
ü
2
502
546
524
ü
2
<1
<1
<1
ü
2
0.2
0.2
0.2
2
7.84
7.92
7.88
ü
2
432
577
505
ü
2
<1
<1
<1
ü
2
0.1
1.3
0.7
2
8.11
8.30
8.21
ü
2
459
488
474
ü
2
1
4
3
ü
2
0.3
1.1
0.7
6
8.01
8.67
8.51
(1)
2
493
494
494
ü
2
<1
<1
<1
ü
2
0.2
0.3
0.3
2
7.55
8.00
7.78
ü
2
504
526
515
ü
2
<1
<1
<1
ü
2
0.2
0.3
0.3
2
8.05
8.07
8.06
ü
2
491
533
512
ü
2
<1
<1
<1
ü
2
0.3
0.6
0.5
2
7.65
7.97
7.81
ü
2
477
534
506
ü
2
<1
<1
<1
ü
2
0.3
0.5
0.4
2
8.65
8.76
8.71
(1)
2
519
540
530
ü
2
<1
<1
<1
ü
2
<0.1
<0.1
<0.1
2
8.24
8.37
8.31
ü
2
524
532
528
ü
2
<1
<1
<1
ü
2
<0.1
<0.1
<0.1
2
7.84
8.41
8.13
ü
2
491
528
510
ü
2
<1
<1
<1
ü
2
0.2
0.4
0.3
4
6.81
7.18
7.03
ü
4
1019
1044
1033
(4)
4
<1
<1
<1
ü
4
<0.1
0.4
0.2
2
7.51
7.58
7.55
ü
2
493
505
499
ü
2
<1
<1
<1
ü
2
0.3
0.4
0.4
2
8.51
8.78
8.65
(1)
2
536
549
543
ü
2
<1
<1
<1
ü
2
0.2
0.2
0.2
2
8.01
8.11
8.06
ü
2
473
527
500
ü
2
<1
<1
<1
ü
2
0.4
0.4
0.4
2
7.58
8.03
7.81
ü
2
487
522
505
ü
2
<1
<1
<1
ü
2
0.2
0.4
0.3
2
8.38
8.58
8.48
ü
2
488
513
501
ü
2
<1
<1
<1
ü
2
0.3
0.5
0.4
6
7.65
7.88
7.77
ü
6
784
895
844
(4)
6
<1
<1
<1
ü
6
<0.1
0.3
<0.1
4
6.64
6.94
6.78
ü
4
622
636
631
(4)
4
<1
<1
<1
ü
4
0.1
0.4
0.3
2
7.84
8.27
8.06
ü
2
477
523
500
ü
2
<1
<1
<1
ü
2
0.4
0.6
0.5
4
8.43
9.46
9.05
(2)
4
422
482
445
ü
4
<1
2
<1
ü
4
0.4
0.9
0.7
2
7.93
7.99
7.96
ü
2
480
498
489
ü
2
<1
2
<1
ü
2
0.3
0.4
0.4
4
6.25
7.97
7.17
ü
4
578
678
649
(4)
4
<1
<1
<1
ü
4
<0.1
0.5
0.2
2
8.17
8.31
8.24
ü
2
502
535
519
ü
2
<1
<1
<1
ü
2
0.1
0.4
0.3
4
7.60
7.94
7.79
ü
4
476
535
502
ü
4
<1
<1
<1
ü
4
0.3
0.7
0.4
1
<1
0.5
1
7.97
7.97
7.97
ü
498
498
498
ü
1
<1
<1
ü
1
0.5
0.5
478
ü
2
8.09
8.23
8.16
ü
2
444
512
ü
2
3
5
4
2
0.3
0.4
0.4
2
8.11
8.59
8.35
ü
2
496
512
504
ü
2
<1
<1
<1
ü
2
0.4
0.5
0.5
2
7.10
7.94
7.52
ü
2
489
530
510
ü
2
<1
<1
<1
ü
2
<0.1
<0.1
<0.1
2
8.66
8.68
8.67
(1)
2
474
521
498
ü
2
<1
<1
<1
ü
2
0.6
0.8
0.7
4
7.82
8.00
7.93
ü
4
384
574
509
ü
4
<1
<1
<1
ü
4
<0.1
<0.1
<0.1
6
7.65
7.99
7.82
ü
6
730
809
767
(4)
6
<1
<1
<1
ü
6
<0.1
<0.1
<0.1
2
7.85
7.95
7.90
ü
2
486
511
499
ü
2
<1
<1
<1
ü
2
0.2
0.4
0.3
2
8.04
8.12
8.08
ü
2
473
518
496
ü
2
<1
2
<1
ü
2
0.3
0.4
0.4
2
7.57
7.72
7.65
ü
2
822
931
877
(4)
2
<1
<1
<1
ü
2
<0.1
<0.1
<0.1
2
8.28
8.41
8.35
ü
2
486
522
504
ü
2
<1
2
<1
ü
2
0.3
0.3
0.3
2
8.07
8.34
8.21
ü
2
512
541
527
ü
2
<1
<1
<1
ü
2
0.3
0.3
0.3
2
7.92
8.49
8.21
ü
2
407
576
492
ü
2
<1
<1
<1
ü
2
0.8
1.3
1.1
2
6.24
6.43
6.34
(3)
2
62
65
64
ü
2
<1
<1
<1
ü
2
1.4
2
1.7
2
7.95
8.31
8.13
ü
2
507
539
523
ü
2
<1
2
<1
ü
2
0.2
0.4
0.3
2
8.08
8.09
8.09
ü
2
505
518
512
ü
2
<1
<1
<1
ü
2
0.3
0.5
0.4
2
7.64
7.84
7.74
ü
2
500
539
520
ü
2
<1
<1
<1
ü
2
0.1
0.3
0.2
2
8.14
8.25
8.20
ü
2
465
515
490
ü
2
<1
<1
<1
ü
2
0.3
0.3
0.3
2
8.43
8.58
8.51
(1)
2
470
517
494
ü
2
<1
<1
<1
ü
2
0.3
0.6
0.5
2
8.48
8.53
8.51
(1)
2
535
540
538
ü
2
<1
<1
<1
ü
2
<0.1
<0.1
<0.1
2
7.91
8.57
8.24
ü
2
490
520
505
ü
2
<1
<1
<1
ü
2
<0.1
0.2
<0.1
2
7.74
8.01
7.88
ü
2
474
504
489
ü
2
<1
<1
<1
ü
2
<0.1
0.2
<0.1
4
7.00
7.71
7.43
ü
4
132
589
295
ü
4
<1
3
<1
ü
4
0.8
2.1
1.6
2
8.36
8.42
8.39
ü
2
879
902
891
(4)
2
<1
<1
<1
ü
2
<0.1
0.2
<0.1
2
7.74
8.14
7.94
ü
2
477
514
496
ü
2
<1
<1
<1
ü
2
0.4
0.7
0.6
2
8.10
8.15
8.13
ü
2
461
505
483
ü
2
<1
<1
<1
ü
2
0.5
0.6
0.6
2
8.25
8.36
8.31
ü
2
475
505
490
ü
2
<1
<1
<1
ü
2
0.3
0.3
0.3
2
8.54
8.61
8.58
(1)
2
459
512
486
ü
2
<1
<1
<1
ü
2
0.2
0.4
0.3
2
7.68
8.21
7.95
ü
2
474
524
499
ü
2
<1
<1
<1
ü
2
0.2
0.3
0.3
2
8.10
8.34
8.22
ü
2
476
533
505
ü
2
<1
<1
<1
ü
2
0.2
1.2
0.7
2
8.15
8.22
8.19
ü
2
527
545
536
ü
2
<1
1
<1
ü
2
<0.1
0.2
<0.1
2
8.32
8.33
8.33
ü
2
526
543
535
ü
2
<1
<1
<1
ü
2
<0.1
<0.1
<0.1
2
8.06
8.07
8.07
ü
2
457
513
485
ü
2
<1
1
<1
ü
2
0.4
0.5
0.5
2
7.80
7.92
7.86
ü
2
496
528
512
ü
2
<1
<1
<1
ü
2
0.1
0.2
0.2
2
8.08
8.24
8.16
ü
2
473
488
481
ü
2
<1
<1
<1
ü
2
0.2
0.3
0.3
(1) Elevated pH is caused by leaching of calcium carbonate from the protective cement lining of the pipes after long water transit times. This characteristic is found in a number of our localities on our large water supply schemes. (2) Elevated pH is characteristic of the
source supplying this locality. (3) Low pH is characteristic of the source supplying this locality. (4) Elevated TDS is a natural characteristic of the source supplying this locality.
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 13
South West
Health related variables
E. coli
Samples with
>0 cfu/100mL
Locality
Samples Taken
Allanson
Augusta
Australind
Balingup
Binningup
Boyanup
Boyup Brook
Bridgetown
Brunswick Junction
Capel
Collie
Cowaramup
Dalyellup
Dardanup
Darkan
Donnybrook
Dunsborough
Eaton
Greenbushes
Harvey
Hester TWS
Kirup
Logue Brook
Manjimup
Margaret River
Mullalyup
Myalup
Nannup
Northcliffe
Pemberton
Peppermint Grove
Preston Beach
Quinninup
Waroona
Yarloop
13
67
91
24
51
46
50
63
52
52
102
52
65
13
13
52
65
65
26
51
13
12
13
64
65
13
13
23
26
52
13
20
13
52
13
(1) No samples required
Max cfu/100mL
Thermophilic Naegleria
Requirement
Met
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
in this 12 month period
Samples Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
7
32
45
13
25
7
13
32
12
13
32
7
19
7
7
26
32
32
12
51
7
5
7
32
32
7
13
13
13
12
6
6
7
52
7
Samples with
Thermophilic
Naegleria
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Fluoride
Hydrocarbons
Metals
Concentration (mg/L)
Requirement
Met
Samples Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
4
4
2
2
4
2
2
2
2
2
56
2
2
2
4
2
56
2
2
54
1
2
2
56
2
2
2
4
2
2
2
2
2
56
2
Min
Max
0.80
0.25
0.25
<0.1
0.80
0.15
<0.1
<0.1
0.20
0.15
<0.1
<0.1
<0.1
<0.1
0.80
<0.1
0.70
0.15
0.10
<0.1
0.15
<0.1
0.80
0.70
<0.1
<0.1
0.75
<0.1
0.80
<0.1
0.25
<0.1
0.85
0.70
0.80
0.95
0.25
0.30
<0.1
0.90
0.20
0.15
<0.1
0.30
0.25
1.10
<0.1
<0.1
<0.1
0.90
<0.1
0.95
0.15
0.10
0.95
0.15
<0.1
0.85
1.00
<0.1
<0.1
0.80
<0.1
0.85
<0.1
0.30
0.15
0.85
1.00
0.90
Mean
0.88
0.25
0.28
<0.1
0.86
0.18
<0.1
<0.1
0.25
0.20
0.86
<0.1
<0.1
<0.1
0.85
<0.1
0.82
0.15
0.10
0.81
0.15
<0.1
0.83
0.89
<0.1
<0.1
0.78
<0.1
0.83
<0.1
0.28
<0.1
0.85
0.87
0.85
Samples Taken
1
0
1
0
0
0
0
0
0
0
2
2
0
0
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
1
1
Guideline Met
ü
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
ü
(1)
(1)
(1)
(1)
(1)
ü
ü
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
ü
ü
ü
Samples Taken
2
4
5
2
2
2
2
2
2
6
4
8
5
2
2
5
5
5
2
2
2
2
2
2
5
2
2
4
2
2
2
5
5
2
2
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 14
Health related variables
South West
Nitrate
Pesticides
Radiological
Trihalomethanes
Concentration (mg/L)
Concentration (mg/L)
Locality
Samples Taken
Allanson
Augusta
Australind
Balingup
Binningup
Boyanup
Boyup Brook
Bridgetown
Brunswick Junction
Capel
Collie
Cowaramup
Dalyellup
Dardanup
Darkan
Donnybrook
Dunsborough
Eaton
Greenbushes
Harvey
Hester TWS
Kirup
Logue Brook
Manjimup
Margaret River
Mullalyup
Myalup
Nannup
Northcliffe
Pemberton
Peppermint Grove
Preston Beach
Quinninup
Waroona
Yarloop
4
<0.05
0.1
<0.05
8
<0.05
0.8
0.1
4
<0.05
<0.05
<0.05
4
<0.05
0.1
<0.05
4
<0.05
0.1
<0.05
4
<0.05
<0.05
<0.05
4
<0.05
0.1
<0.05
5
<0.05
0.1
<0.05
2
<0.05
<0.05
<0.05
4
<0.05
<0.05
<0.05
8
<0.05
0.1
<0.05
4
0.1
0.2
0.1
4
<0.05
<0.05
<0.05
3
<0.05
0.1
<0.05
4
<0.05
<0.05
<0.05
4
0.1
3.4
1.9
4
<0.05
<0.05
<0.05
4
<0.05
<0.05
<0.05
4
<0.05
<0.05
<0.05
3
<0.05
0.1
<0.05
2
<0.05
<0.05
<0.05
4
<0.05
0.1
<0.05
4
<0.05
0.1
<0.05
4
<0.05
<0.05
<0.05
4
<0.05
0.2
0.1
4
<0.05
0.1
0.1
4
<0.05
<0.05
<0.05
7
<0.05
0.1
<0.05
4
<0.05
0.1
<0.05
4
0.1
0.3
0.2
4
<0.05
<0.05
<0.05
4
0.9
1.1
1
4
<0.05
0.1
<0.05
4
<0.05
0.1
<0.05
2
<0.05
<0.05
<0.05
(1) No samples required in this 12 month period
Min
Max
Other Health Related
Mean
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
1
2
1
4
1
1
4
3
2
1
2
4
4
1
1
1
1
1
1
1
1
1
1
4
4
1
1
2
4
4
4
1
4
2
1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
0
0
1
1
1
0
1
0
0
0
1
0
1
1
1
0
1
0
0
0
1
1
1
0
0
0
2
0
1
0
0
1
1
1
Guideline Met
(1)
(1)
(1)
ü
ü
ü
(1)
ü
(1)
(1)
(1)
ü
(1)
ü
ü
ü
(1)
ü
(1)
(1)
(1)
ü
ü
ü
(1)
(1)
(1)
ü
(1)
ü
(1)
(1)
ü
ü
ü
Samples Taken
2
6
2
4
4
2
5
2
2
2
6
4
2
2
4
2
2
2
4
2
2
4
2
2
4
4
4
5
2
4
2
8
4
2
2
Min
0.120
0.010
0.003
0.095
0.053
<0.001
0.069
0.001
0.005
<0.001
0.037
0.084
0.031
<0.001
0.160
0.003
0.023
<0.001
0.056
0.001
0.039
0.060
0.003
0.057
0.030
<0.001
0.050
0.029
0.062
0.079
<0.001
0.140
0.100
0.006
0.004
Max
0.160
0.036
0.006
0.180
0.100
0.002
0.150
0.046
0.016
0.003
0.140
0.110
0.033
0.004
0.210
0.012
0.034
0.002
0.110
0.031
0.044
0.170
0.082
0.098
0.075
0.081
0.140
0.055
0.110
0.110
<0.001
0.170
0.140
0.044
0.095
Mean
0.140
0.020
0.005
0.119
0.067
<0.001
0.117
0.024
0.011
0.002
0.081
0.098
0.032
0.002
0.180
0.008
0.029
<0.001
0.073
0.016
0.042
0.106
0.043
0.078
0.062
0.052
0.085
0.045
0.086
0.097
<0.001
0.156
0.123
0.025
0.050
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
1
0
0
0
0
0
0
0
1
0
2
0
0
0
1
0
0
1
2
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
Requirement
Met
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
ü
(1)
(1)
(1)
ü
(1)
(1)
ü
ü
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 15
Aesthetic (Non-health related) Variables
South West
Aluminium
Hardness
Iron
Manganese
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Locality
Samples Taken
Allanson
Augusta
Australind
Balingup
Binningup
Boyanup
Boyup Brook
Bridgetown
Brunswick Junction
Capel
Collie
Cowaramup
Dalyellup
Dardanup
Darkan
Donnybrook
Dunsborough
Eaton
Greenbushes
Harvey
Hester TWS
Kirup
Logue Brook
Manjimup
Margaret River
Mullalyup
Myalup
Nannup
Northcliffe
Pemberton
Peppermint Grove
Preston Beach
Quinninup
Waroona
Yarloop
4
0.012
0.018
8
<0.008
0.008
4
<0.008
<0.008
4
0.010
0.018
4
0.012
0.025
4
<0.008
0.008
4
0.014
0.035
5
<0.008
0.045
2
<0.008
<0.008
4
<0.008
<0.008
8
<0.008
0.020
4
<0.008
0.020
4
<0.008
<0.008
3
<0.008
<0.008
4
0.016
0.040
4
0.070
0.280
4
0.018
0.030
4
<0.008
<0.008
4
0.014
0.030
3
0.012
0.055
2
0.020
0.030
4
<0.008
0.018
4
0.035
0.065
0.080
4
0.012
4
<0.008
0.018
4
<0.008
0.075
4
0.014
0.018
7
0.010
0.045
4
0.020
0.085
4
0.012
0.030
4
<0.008
<0.008
4
<0.008
0.010
4
0.065
0.210
4
0.025
0.050
2
0.020
0.040
(1) Elevated aluminium is characteristic of the
Min
Max
Mean
Guideline Met
Samples Taken
0.015
ü
<0.008
ü
<0.008
ü
0.014
ü
0.020
ü
<0.008
ü
0.026
ü
0.018
ü
<0.008
ü
<0.008
ü
0.013
ü
0.013
ü
<0.008
ü
<0.008
ü
0.025
ü
0.205
(1)
0.022
ü
<0.008
ü
0.024
ü
0.028
ü
0.025
ü
<0.008
ü
0.044
ü
0.037
ü
<0.008
ü
0.034
ü
0.016
ü
0.021
ü
0.041
ü
0.023
ü
<0.008
ü
<0.008
ü
0.114
ü
0.043
ü
0.030
ü
source supplying this locality. (2)
Min
Max
Mean
Guideline Met
Samples Taken
4
40
45
41
ü
4
8
70
390
125
ü
8
4
80
85
81
ü
4
4
75
110
90
ü
4
4
30
55
43
ü
4
4
100
100
100
ü
4
4
65
100
78
ü
4
5
110
150
134
ü
5
2
80
85
83
ü
2
4
45
50
49
ü
4
8
19
40
35
ü
8
4
50
55
54
ü
4
4
65
70
68
ü
4
3
25
25
25
ü
3
4
50
60
55
ü
4
4
75
95
85
ü
4
4
55
65
61
ü
4
4
110
120
113
ü
4
4
95
110
104
ü
4
3
25
55
35
ü
3
2
100
130
115
ü
2
4
30
45
38
ü
4
4
55
70
61
ü
4
4
40
50
46
ü
4
4
50
60
54
ü
4
4
30
75
48
ü
4
4
35
60
48
ü
4
7
90
120
102
ü
7
4
40
50
46
ü
4
4
50
60
58
ü
4
4
55
60
56
ü
4
4
310
320
315
(2)
4
4
40
60
50
ü
4
4
55
65
58
ü
4
2
55
55
55
ü
2
Elevated hardness is characteristic of the source supplying this locality.
Min
0.045
<0.003
0.070
0.004
0.035
<0.003
0.070
0.020
0.080
0.050
0.040
0.100
0.035
0.010
0.060
0.025
0.006
0.060
0.008
0.006
0.025
0.004
0.020
0.090
0.060
0.015
0.045
<0.003
0.080
0.010
0.010
0.006
0.100
0.004
0.004
Max
0.080
0.160
0.120
0.015
0.070
0.006
0.220
0.260
0.080
0.070
0.080
0.260
0.080
0.010
0.160
0.060
0.010
0.090
0.045
0.030
0.050
0.025
0.080
0.260
0.220
0.070
0.120
0.070
0.280
0.030
0.050
0.008
0.200
0.008
0.090
Mean
0.061
0.081
0.095
0.008
0.049
0.004
0.138
0.096
0.080
0.058
0.055
0.140
0.054
0.010
0.103
0.039
0.009
0.075
0.023
0.022
0.038
0.013
0.035
0.168
0.113
0.045
0.079
0.039
0.170
0.020
0.036
0.007
0.130
0.006
0.047
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
8
4
4
4
4
4
5
2
4
8
4
4
3
4
4
4
4
4
3
2
4
4
4
4
4
4
7
4
4
4
4
4
4
2
Min
0.004
<0.002
0.004
<0.002
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
0.003
0.005
0.003
<0.002
0.003
0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.003
0.006
0.002
<0.002
<0.002
0.003
0.003
<0.002
<0.002
0.003
<0.002
<0.002
Max
0.012
0.003
0.008
<0.002
0.004
<0.002
0.012
0.004
0.010
0.005
0.014
0.020
0.010
<0.002
0.020
0.006
<0.002
<0.002
<0.002
<0.002
<0.002
0.006
0.004
0.012
0.014
0.014
0.004
0.004
0.012
0.010
<0.002
<0.002
0.006
<0.002
<0.002
Mean
0.009
<0.002
0.006
<0.002
<0.002
<0.002
0.005
<0.002
0.007
<0.002
0.008
0.013
0.006
<0.002
0.011
0.004
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.007
0.009
0.006
<0.002
<0.002
0.007
0.006
<0.002
<0.002
0.005
<0.002
<0.002
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 16
Aesthetic (Non-health related) Variables
South West
pH
TDS
True Colour
Value (pH units)
Concentration (mg/L)
Value (TCU)
Locality
Samples Taken
Allanson
Augusta
Australind
Balingup
Binningup
Boyanup
Boyup Brook
Bridgetown
Brunswick Junction
Capel
Collie
Cowaramup
Dalyellup
Dardanup
Darkan
Donnybrook
Dunsborough
Eaton
Greenbushes
Harvey
Hester TWS
Kirup
Logue Brook
Manjimup
Margaret River
Mullalyup
Myalup
Nannup
Northcliffe
Pemberton
Peppermint Grove
Preston Beach
Quinninup
Waroona
Yarloop
4
6.89
7.09
7.01
ü
4
185
215
8
7.10
7.91
7.44
ü
8
305
915
4
7.45
7.84
7.69
ü
4
487
538
4
7.79
8.12
7.98
ü
4
328
494
4
6.84
7.75
7.20
ü
4
143
203
4
7.77
8.20
7.91
ü
4
363
380
4
7.26
8.14
7.67
ü
4
224
301
5
7.98
8.18
8.08
ü
5
321
395
2
7.72
7.87
7.80
ü
2
506
509
4
6.88
7.12
7.00
ü
4
263
269
8
6.68
6.99
6.85
ü
8
105
204
4
6.78
7.26
7.03
ü
4
237
265
4
8.00
8.08
8.04
ü
4
388
410
3
7.26
7.84
7.55
ü
3
285
294
4
7.79
9.42
8.55
(2)
4
199
237
4
7.51
7.77
7.66
ü
4
467
599
4
8.11
8.49
8.26
ü
4
521
562
4
7.19
7.58
7.37
ü
4
383
400
4
7.93
8.44
8.19
ü
4
301
391
3
6.30
8.78
7.14
ü
3
121
146
2
8.16
8.31
8.24
ü
2
294
381
4
6.61
6.97
6.87
ü
4
201
253
4
7.54
8.22
7.96
ü
4
144
239
7.16
7.04
ü
4
178
216
4
6.85
4
6.74
7.00
6.83
ü
4
232
264
4
6.71
8.15
7.29
ü
4
230
470
4
7.10
7.98
7.48
ü
4
146
201
7
6.71
7.73
7.29
ü
7
303
361
4
6.58
7.33
7.08
ü
4
177
223
4
7.37
7.84
7.63
ü
4
237
295
4
7.12
7.37
7.25
ü
4
280
289
4
7.70
7.88
7.80
ü
4
742
773
4
7.32
7.81
7.61
ü
4
204
502
4
7.78
8.02
7.93
ü
4
126
185
2
7.49
7.80
7.65
ü
2
122
189
(1) Elevated TDS is characteristic of the source supplying this locality. (2) Elevated pH is caused by leaching of calcium
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
198
ü
425
ü
517
ü
404
ü
170
ü
374
ü
251
ü
374
ü
508
ü
266
ü
170
ü
252
ü
399
ü
291
ü
217
ü
534
ü
547
ü
393
ü
355
ü
135
ü
338
ü
227
ü
202
ü
199
ü
248
ü
310
ü
173
ü
333
ü
206
ü
260
ü
285
ü
755
(1)
290
ü
147
ü
156
ü
carbonate from the protective
Min
Max
4
<1
8
<1
4
<1
4
<1
4
<1
4
<1
4
<1
5
<1
2
<1
4
<1
8
<1
4
2
4
<1
3
<1
4
<1
4
<1
4
<1
4
<1
4
<1
3
<1
2
<1
4
<1
4
<1
4
1
4
2
4
<1
4
1
7
<1
4
2
4
<1
4
<1
4
<1
4
<1
4
<1
2
<1
cement lining of the pipes
Turbidity
Value (NTU)
Mean
Guideline Met
2
<1
<1
<1
<1
<1
<1
<1
1
<1
<1
<1
6
2
<1
<1
<1
<1
<1
<1
2
<1
4
3
<1
<1
<1
<1
2
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
<1
1
<1
4
3
5
3
<1
<1
2
2
<1
<1
6
4
<1
<1
<1
<1
2
<1
3
2
<1
<1
2
<1
during periods of low flow.
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
8
4
4
4
4
4
5
2
4
8
4
4
3
4
4
4
4
4
3
2
4
4
4
4
4
4
7
4
4
4
4
4
4
2
Min
Max
0.2
<0.1
0.3
<0.1
<0.1
<0.1
0.8
<0.1
0.3
<0.1
0.3
0.7
<0.1
<0.1
0.2
0.1
<0.1
0.2
<0.1
<0.1
1
<0.1
<0.1
0.7
0.7
<0.1
0.1
<0.1
0.7
<0.1
<0.1
<0.1
0.3
<0.1
<0.1
0.9
0.6
0.4
<0.1
0.6
<0.1
1.8
2.3
0.3
<0.1
0.7
1.2
0.3
<0.1
1
0.5
0.4
0.4
2.9
0.2
1.6
<0.1
0.7
2.1
1.1
0.4
0.6
0.3
3.3
<0.1
0.2
0.1
0.6
<0.1
0.6
Mean
0.5
0.2
0.4
<0.1
0.4
<0.1
1.3
0.8
0.3
<0.1
0.4
0.9
0.2
<0.1
0.6
0.3
<0.1
0.3
1
<0.1
1.3
<0.1
0.2
1.1
0.9
0.2
0.4
<0.1
1.4
<0.1
<0.1
<0.1
0.5
<0.1
0.3
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 17
Great Southern
Health related variables
E. coli
Samples with
>0 cfu/100mL
Locality
Samples Taken
Albany
Boddington
Borden
Bremer Bay
Brookton
Broomehill
Bullaring
Cranbrook
Cuballing
Denmark
Dudinin TWS
Dumbleyung
Frankland
Gnowangerup
Harrismith TWS
Highbury
Hyden
Jerramungup
Karlgarin
Katanning
Kendenup
Kojonup
Kondinin
Kukerin
Kulin
Lake Grace
Lake King
Mt Barker
Muradup
Narrikup
Narrogin
Newdegate
Nyabing
Ongerup
Pingaring
Pingelly
Pingrup
Popanyinning
Rocky Gully
Tambellup
Tincurrin TWS
Varley
Wagin
Walpole
Wandering
Wellstead
Wickepin TWS
Williams
Woodanilling
Yealering
144
48
12
12
48
12
12
12
12
60
12
12
12
48
12
12
12
12
12
65
12
48
12
12
12
48
12
52
12
12
74
12
12
12
12
48
12
12
12
12
12
12
48
14
12
12
12
12
12
12
(1) No samples required
Max cfu/100mL
Thermophilic Naegleria
Requirement
Met
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
in this 12 month period.
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
72
48
6
6
48
12
12
6
12
30
12
12
6
48
12
12
12
6
12
65
6
48
12
12
12
48
6
26
12
6
74
12
12
6
12
48
12
12
6
12
12
6
48
6
12
6
12
12
12
12
Samples with
Thermophilic
Naegleria
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Fluoride
Requirement
Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Hydrocarbons
Metals
Concentration (mg/L)
Samples Taken
52
3
2
4
4
4
4
2
4
2
4
4
2
4
4
4
4
2
4
52
4
4
4
4
4
4
2
52
4
4
54
4
4
2
4
4
4
4
2
4
4
2
4
2
4
2
4
4
4
4
Min
Max
0.15
0.85
<0.1
0.50
0.60
0.70
0.75
<0.1
0.75
<0.1
0.80
0.80
<0.1
0.70
0.80
0.80
0.40
<0.1
0.80
0.65
0.30
0.70
0.80
0.85
0.80
0.85
0.80
0.20
0.75
0.15
0.70
0.60
0.70
<0.1
0.75
0.80
0.70
0.80
0.40
0.75
0.75
<0.1
0.80
<0.1
0.80
0.30
0.75
0.85
0.80
0.80
0.85
0.95
0.10
0.55
0.85
0.85
0.90
0.10
1.00
<0.1
0.90
0.95
<0.1
0.90
0.95
0.95
0.90
<0.1
0.95
0.90
0.70
0.85
0.95
0.90
0.90
0.90
0.80
0.85
0.90
0.70
1.00
0.85
0.85
0.10
0.85
0.95
0.85
0.95
0.80
0.90
0.90
<0.1
0.95
<0.1
0.85
0.35
0.90
0.95
0.95
0.90
Mean
0.62
0.92
<0.1
0.51
0.73
0.80
0.84
<0.1
0.89
<0.1
0.85
0.86
<0.1
0.80
0.86
0.86
0.74
<0.1
0.88
0.79
0.56
0.78
0.89
0.86
0.86
0.86
0.80
0.60
0.80
0.44
0.85
0.75
0.78
<0.1
0.81
0.88
0.80
0.85
0.60
0.81
0.83
<0.1
0.89
<0.1
0.83
0.33
0.85
0.89
0.89
0.86
Samples Taken
8
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
Guideline Met
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
Samples Taken
8
2
2
6
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
3
2
2
2
2
2
4
2
2
2
2
2
2
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 18
Health related variables
Great Southern
Nitrate
Pesticides
Radiological
Trihalomethanes
Concentration (mg/L)
Locality
Samples Taken
Albany
Boddington
Borden
Bremer Bay
Brookton
Broomehill
Bullaring
Cranbrook
Cuballing
Denmark
Dudinin TWS
Dumbleyung
Frankland
Gnowangerup
Harrismith TWS
Highbury
Hyden
Jerramungup
Karlgarin
Katanning
Kendenup
Kojonup
Kondinin
Kukerin
Kulin
Lake Grace
Lake King
Mt Barker
Muradup
Narrikup
Narrogin
Newdegate
Nyabing
Ongerup
Pingaring
Pingelly
Pingrup
Popanyinning
Rocky Gully
Tambellup
Tincurrin TWS
Varley
Wagin
Walpole
Wandering
Wellstead
Wickepin TWS
Williams
Woodanilling
Yealering
16
0.1
0.2
0.1
2
<0.05
0.1
<0.05
2
0.3
0.4
0.3
4
3.3
5.3
4.7
2
<0.05
1.1
0.6
2
<0.05
<0.05
<0.05
2
0.1
0.1
0.1
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
4
<0.05
0.2
0.1
2
<0.05
<0.05
<0.05
2
0.1
0.1
0.1
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
4
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
3
<0.05
<0.05
<0.05
5
0.1
0.2
0.2
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
2
0.1
0.1
0.1
2
<0.05
<0.05
<0.05
2
<0.05
0.1
<0.05
2
<0.05
0.1
<0.05
4
0.1
0.2
0.2
2
<0.05
<0.05
<0.05
6
0.2
0.2
0.2
2
<0.05
<0.05
<0.05
2
<0.05
0.1
<0.05
4
<0.05
<0.05
<0.05
2
0.1
0.4
0.2
2
0.1
0.1
0.1
2
<0.05
<0.05
<0.05
2
<0.05
0.1
0.1
2
<0.05
<0.05
<0.05
1
0.2
0.2
0.2
2
<0.05
<0.05
<0.05
2
0.1
0.1
0.1
2
<0.05
0.1
<0.05
2
<0.05
<0.05
<0.05
4
0.3
0.4
0.3
2
0.1
0.1
0.1
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
2
<0.05
0.1
<0.05
2
<0.05
<0.05
<0.05
2
0.1
0.1
0.1
(1) No samples required in this 12 month period.
Min
Max
Other Health Related
Concentration (mg/L)
Mean
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
4
0
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Guideline Met
ü
(1)
(1)
ü
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Samples Taken
8
3
2
2
4
2
4
4
4
2
2
4
2
2
4
4
4
2
2
4
4
4
4
2
2
4
2
4
4
4
2
2
2
2
2
2
4
4
2
4
2
2
2
4
4
2
2
2
4
4
Min
0.079
0.032
0.054
0.091
0.073
0.074
0.061
0.030
0.076
0.072
0.070
0.055
0.052
0.027
0.140
0.049
0.067
0.038
0.069
0.048
0.120
0.070
0.085
0.076
0.100
0.092
0.049
0.100
0.071
0.110
0.072
0.038
0.100
0.057
0.150
0.099
0.032
0.078
0.097
0.067
0.110
0.032
0.049
0.077
0.100
0.031
0.088
0.050
0.094
0.071
Max
0.120
0.084
0.057
0.100
0.120
0.084
0.130
0.065
0.110
0.140
0.070
0.097
0.061
0.033
0.140
0.081
0.120
0.042
0.130
0.059
0.150
0.140
0.100
0.076
0.130
0.120
0.071
0.140
0.110
0.140
0.080
0.120
0.110
0.068
0.160
0.170
0.074
0.140
0.110
0.110
0.190
0.036
0.065
0.150
0.150
0.035
0.089
0.120
0.150
0.160
Mean
0.103
0.063
0.056
0.096
0.093
0.079
0.096
0.049
0.090
0.106
0.070
0.070
0.057
0.030
0.140
0.068
0.095
0.040
0.100
0.052
0.130
0.102
0.094
0.076
0.115
0.111
0.060
0.125
0.085
0.120
0.076
0.079
0.105
0.063
0.155
0.135
0.057
0.122
0.104
0.081
0.150
0.034
0.057
0.119
0.120
0.033
0.089
0.085
0.129
0.121
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
8
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
1
0
0
0
Requirement
Met
ü
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
ü
(1)
(1)
(1)
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 19
Aesthetic (Non-health related) Variables
Great Southern
Aluminium
Hardness
Iron
Manganese
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Locality
Samples Taken
Albany
Boddington
Borden
Bremer Bay
Brookton
Broomehill
Bullaring
Cranbrook
Cuballing
Denmark
Dudinin TWS
Dumbleyung
Frankland
Gnowangerup
Harrismith TWS
Highbury
Hyden
Jerramungup
Karlgarin
Katanning
Kendenup
Kojonup
Kondinin
Kukerin
Kulin
Lake Grace
Lake King
Mt Barker
Muradup
Narrikup
Narrogin
Newdegate
Nyabing
Ongerup
Pingaring
Pingelly
Pingrup
Popanyinning
Rocky Gully
Tambellup
Tincurrin TWS
Varley
Wagin
Walpole
Wandering
Wellstead
Wickepin TWS
Williams
Woodanilling
Yealering
16
<0.008
0.016
0.009
ü
2
0.016
0.030
0.023
ü
2
0.040
0.040
0.040
ü
4
<0.008
<0.008
<0.008
ü
2
0.025
0.075
0.050
ü
2
0.020
0.025
0.023
ü
2
0.030
0.050
0.040
ü
2
0.018
0.025
0.022
ü
2
0.012
0.025
0.019
ü
4
0.014
0.045
0.032
ü
2
0.016
0.020
0.018
ü
2
0.014
0.025
0.020
ü
2
0.016
0.020
0.018
ü
2
0.020
0.030
0.025
ü
4
0.010
0.018
0.016
ü
2
0.018
0.035
0.027
ü
2
0.035
0.035
0.035
ü
2
0.080
0.220
0.150
ü
2
0.020
0.025
0.023
ü
3
0.012
0.110
0.045
ü
5
0.010
0.040
0.018
ü
2
0.020
0.030
0.025
ü
2
0.025
0.025
0.025
ü
0.025
0.023
ü
2
0.020
2
0.010
0.018
0.014
ü
2
0.012
0.014
0.013
ü
2
0.016
0.020
0.018
ü
4
0.012
0.014
0.013
ü
2
0.020
0.030
0.025
ü
2
0.008
0.012
0.010
ü
2
0.012
0.016
0.014
ü
2
0.030
0.055
0.043
ü
4
0.008
0.014
0.012
ü
2
0.050
0.085
0.068
ü
2
0.025
0.030
0.028
ü
2
0.020
0.025
0.023
ü
2
<0.008
0.010
<0.008
ü
2
0.010
0.020
0.015
ü
1
0.012
0.012
0.012
ü
2
0.030
0.035
0.033
ü
2
0.018
0.030
0.024
ü
2
0.012
0.018
0.015
ü
2
0.012
0.018
0.015
ü
4
0.040
0.190
0.094
ü
2
0.018
0.025
0.022
ü
2
0.020
0.035
0.028
ü
2
0.014
0.020
0.017
ü
2
0.012
0.020
0.016
ü
2
0.018
0.035
0.027
ü
2
0.018
0.030
0.024
ü
(1) Elevated hardness is characterstic of the souce supplying this locality. (2) 1
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
Min
16
120
280
196
ü
16
0.020
2
45
50
48
ü
2
0.060
2
20
30
25
ü
2
0.004
4
160
190
180
ü
4
<0.003
2
65
65
65
ü
2
0.090
2
60
60
60
ü
2
0.080
2
65
70
68
ü
6
0.080
2
15
18
17
ü
2
0.120
2
45
55
50
ü
6
0.070
4
55
80
65
ü
4
0.006
2
60
65
63
ü
6
0.140
2
65
70
68
ü
2
0.050
2
10
10
10
ü
2
0.040
2
55
60
58
ü
2
0.080
4
55
65
59
ü
4
0.100
2
45
55
50
ü
6
0.080
2
45
60
53
ü
2
0.020
2
17
20
19
ü
2
0.050
2
65
65
65
ü
2
0.030
3
50
55
52
ü
3
0.100
(1)
5
240
290
262
5
0.060
2
60
60
60
ü
2
0.100
2
65
70
68
ü
2
0.030
2
60
70
65
ü
2
0.035
2
60
65
63
ü
2
0.090
2
65
65
65
ü
2
0.030
2
65
65
65
ü
2
0.060
4
240
280
255
(1)
4
0.060
2
60
60
60
ü
2
0.100
10
230
280
260
(1)
10
0.050
2
45
45
45
ü
2
0.090
2
65
65
65
ü
2
0.040
4
50
55
51
ü
4
0.090
2
20
20
20
ü
2
0.025
2
70
70
70
ü
2
0.030
2
55
60
58
ü
2
0.120
2
50
55
53
ü
2
0.060
2
50
50
50
ü
2
0.090
1
260
260
260
(1)
5
0.070
2
60
60
60
ü
2
0.080
2
55
65
60
ü
6
0.180
2
14
15
15
ü
2
0.050
2
45
45
45
ü
2
0.060
4
55
70
61
ü
4
0.004
2
45
50
48
ü
2
0.080
2
13
14
14
ü
2
0.090
2
50
50
50
ü
2
0.090
2
35
45
40
ü
2
0.060
2
50
55
53
ü
2
0.090
2
60
60
60
ü
2
0.100
Sample taken during a dirty water incident - all other samples well below guideline.
Max
0.120
0.080
0.015
0.004
0.300
0.120
0.240
0.120
0.220
0.020
0.160
0.090
0.060
0.200
0.240
0.360
0.050
0.070
0.070
0.580
1.600
0.160
0.090
0.070
0.200
0.100
0.120
0.200
0.140
0.200
0.220
0.240
0.160
0.025
0.060
0.160
0.080
0.180
1.000
0.140
0.300
0.120
0.200
0.020
0.120
0.120
0.180
0.060
0.180
0.100
Mean
0.072
0.070
0.010
<0.003
0.195
0.100
0.150
0.120
0.162
0.011
0.150
0.070
0.050
0.140
0.155
0.187
0.035
0.060
0.050
0.273
0.374
0.130
0.060
0.053
0.145
0.065
0.090
0.125
0.120
0.108
0.155
0.140
0.123
0.025
0.045
0.140
0.070
0.135
0.404
0.110
0.237
0.085
0.130
0.010
0.100
0.105
0.135
0.060
0.135
0.100
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(2)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
(2)
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
16
2
2
4
2
2
2
2
2
4
2
2
2
2
4
2
2
2
2
3
5
2
2
2
2
2
2
4
2
6
2
2
4
2
2
2
2
2
1
2
2
2
2
4
2
2
2
2
2
2
Min
<0.002
0.010
<0.002
<0.002
0.006
0.002
0.003
0.004
0.005
<0.002
0.004
<0.002
<0.002
<0.002
0.005
0.007
<0.002
<0.002
<0.002
0.003
<0.002
0.003
0.004
<0.002
0.004
<0.002
0.003
<0.002
0.002
<0.002
0.007
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
0.005
<0.002
<0.002
0.006
<0.002
0.004
<0.002
0.006
<0.002
0.006
0.010
0.004
<0.002
Max
<0.002
0.014
<0.002
<0.002
0.035
0.003
0.018
0.004
0.014
<0.002
0.006
0.007
0.003
0.008
0.012
0.025
<0.002
0.003
0.003
0.045
0.010
0.007
0.004
0.002
0.008
0.002
0.003
<0.002
0.002
<0.002
0.009
0.009
0.005
<0.002
0.008
0.005
<0.002
0.009
<0.002
0.007
0.010
<0.002
0.007
0.020
0.007
0.006
0.008
0.014
0.012
0.007
Mean
<0.002
0.012
<0.002
<0.002
0.021
0.003
0.011
0.004
0.010
<0.002
0.005
0.004
<0.002
0.004
0.008
0.016
<0.002
<0.002
<0.002
0.017
<0.002
0.005
0.004
<0.002
0.006
<0.002
0.003
<0.002
0.002
<0.002
0.008
0.005
0.003
<0.002
0.004
0.005
<0.002
0.007
<0.002
0.004
0.008
<0.002
0.006
0.005
0.007
0.003
0.007
0.012
0.008
0.004
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 20
Aesthetic (Non-health related) Variables
Great Southern
pH
TDS
True Colour
Value (pH units)
Concentration (mg/L)
Value (TCU)
Turbidity
Value (NTU)
Locality
Samples Taken
Albany
Boddington
Borden
Bremer Bay
Brookton
Broomehill
Bullaring
Cranbrook
Cuballing
Denmark
Dudinin TWS
Dumbleyung
Frankland
Gnowangerup
Harrismith TWS
Highbury
Hyden
Jerramungup
Karlgarin
Katanning
Kendenup
Kojonup
Kondinin
Kukerin
Kulin
Lake Grace
Lake King
Mt Barker
Muradup
Narrikup
Narrogin
Newdegate
Nyabing
Ongerup
Pingaring
Pingelly
Pingrup
Popanyinning
Rocky Gully
Tambellup
Tincurrin TWS
Varley
Wagin
Walpole
Wandering
Wellstead
Wickepin TWS
Williams
Woodanilling
Yealering
16
7.46
7.93
7.70
ü
16
459
632
525
ü
16
<1
2
<1
2
7.42
7.48
7.45
ü
2
191
224
208
ü
2
2
2
2
2
7.29
7.51
7.40
ü
2
94
122
108
ü
2
<1
<1
<1
4
8.12
8.25
8.20
ü
4
893
996
925
(3)
4
<1
<1
<1
2
7.18
7.49
7.34
ü
2
249
318
284
ü
2
<1
2
<1
2
7.50
7.61
7.56
ü
2
223
247
235
ü
2
1
2
2
6
7.31
8.06
7.63
ü
2
251
270
261
ü
2
<1
<1
<1
2
6.30
6.94
6.62
ü
2
68
70
69
ü
2
3
3
3
2
7.11
7.16
7.14
ü
2
209
228
219
ü
2
2
3
3
4
7.33
7.73
7.56
ü
4
440
512
475
ü
4
<1
<1
<1
6
8.47
9.32
8.86
(1)
2
231
254
243
ü
2
<1
2
<1
2
8.40
8.71
8.56
(1)
2
234
246
240
ü
2
<1
<1
<1
2
5.86
6.73
6.30
(2)
2
35
38
37
ü
2
2
3
3
2
7.32
7.40
7.36
ü
2
212
237
225
ü
2
<1
5
3
4
8.05
9.03
8.52
(1)
4
223
239
229
ü
4
1
3
2
2
7.04
7.12
7.08
ü
2
206
231
219
ü
2
2
3
3
2
7.54
8.12
7.83
ü
2
150
235
193
ü
2
<1
2
<1
2
7.02
7.30
7.16
ü
2
90
97
94
ü
2
<1
<1
<1
2
7.86
8.69
8.28
ü
2
247
257
252
ü
2
<1
<1
<1
3
7.14
7.17
7.16
ü
3
201
229
219
ü
3
<1
5
2
5
7.78
8.20
8.05
ü
5
556
608
581
ü
5
<1
<1
<1
2
7.51
8.13
7.82
ü
2
221
234
228
ü
2
2
3
3
2
7.79
7.88
7.84
ü
2
253
265
259
ü
2
<1
2
<1
8.93
8.50
ü
2
247
260
254
ü
2
<1
<1
<1
2
8.06
2
9.17
9.35
9.26
(1)
2
238
240
239
ü
2
1
2
2
2
7.86
8.49
8.18
ü
2
240
252
246
ü
2
<1
2
<1
2
7.64
7.81
7.73
ü
2
238
247
243
ü
2
1
1
1
4
7.74
8.03
7.89
ü
4
544
584
565
ü
4
<1
<1
<1
2
6.66
8.50
7.58
ü
2
221
241
231
ü
2
<1
2
<1
6
7.46
8.02
7.70
ü
6
547
598
574
ü
6
<1
<1
<1
2
7.13
7.16
7.15
ü
2
201
219
210
ü
2
<1
2
<1
2
7.90
7.94
7.92
ü
2
238
246
242
ü
2
<1
2
<1
4
7.04
7.29
7.17
ü
4
203
223
213
ü
4
<1
4
3
2
7.28
7.52
7.40
ü
2
111
124
118
ü
2
<1
<1
<1
2
9.07
9.51
9.29
(1)
2
242
250
246
ü
2
<1
1
<1
2
7.41
8.86
8.14
ü
2
221
243
232
ü
2
<1
2
<1
2
7.13
7.47
7.30
ü
2
215
230
223
ü
2
<1
2
<1
2
7.47
7.62
7.55
ü
2
214
219
217
ü
2
2
4
3
1
8.16
8.16
8.16
ü
1
566
566
566
ü
1
<1
<1
<1
2
7.85
8.68
8.27
ü
2
219
236
228
ü
2
<1
2
<1
2
7.51
7.80
7.66
ü
2
232
238
235
ü
2
2
4
3
2
6.86
7.01
6.94
ü
2
42
45
44
ü
2
<1
<1
<1
2
6.96
7.28
7.12
ü
2
191
220
206
ü
2
<1
3
2
4
7.03
8.41
7.81
ü
4
289
491
406
ü
4
<1
<1
<1
2
7.56
7.98
7.77
ü
2
199
219
209
ü
2
<1
1
<1
2
6.41
6.56
6.49
(2)
2
89
100
95
ü
2
1
1
1
2
7.45
7.48
7.47
ü
2
203
212
208
ü
2
<1
2
<1
2
6.96
7.05
7.01
ü
2
181
206
194
ü
2
1
3
2
2
7.27
7.35
7.31
ü
2
219
233
226
ü
2
2
3
3
2
8.73
9.20
8.97
(1)
2
225
231
228
ü
2
2
3
3
(1) Elevated pH is caused by leaching of calcium carbonate from the protective cement lining of the pipes after long water transit times. This characteristic is found in a number of our localities on our large
objectionable to our customers. (2) Low pH is a characteristic of the source supplying this locality. (3) Elevated TDS is characteristic of the source supplying this locality.
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
Min
ü
16
ü
2
ü
2
ü
4
ü
2
ü
2
ü
2
ü
2
ü
2
ü
4
ü
2
ü
2
ü
2
ü
2
ü
4
ü
2
ü
2
ü
2
ü
2
ü
3
ü
5
ü
2
ü
2
ü
2
ü
2
ü
2
ü
6
ü
4
ü
2
ü
6
ü
2
ü
2
ü
4
ü
2
ü
2
ü
2
ü
2
ü
2
ü
1
ü
2
ü
2
ü
2
ü
2
ü
4
ü
2
ü
2
ü
2
ü
2
ü
2
ü
2
water supply schemes.
Max
Mean
Guideline Met
<0.1
1.1
0.4
0.5
0.6
0.6
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.4
1.4
0.9
0.7
0.8
0.8
0.3
1.4
0.9
1.3
1.8
1.6
0.9
1
1
<0.1
<0.1
<0.1
0.4
0.7
0.6
0.3
0.3
0.3
0.4
1.1
0.8
0.8
0.8
0.8
0.2
0.6
0.5
0.5
1.6
1.1
0.1
0.4
0.3
0.2
0.6
0.4
0.2
0.4
0.3
0.7
7.7
3.2
0.2
11
2.4
0.6
1
0.8
0.6
0.7
0.7
0.3
0.2
0.3
0.6
0.6
0.6
0.1
0.2
0.2
0.2
0.4
0.4
0.4
0.7
0.6
0.4
0.8
0.6
0.2
1.1
0.7
0.6
0.6
0.6
0.2
3.1
1.7
0.4
0.8
0.6
0.6
0.9
0.8
0.2
0.6
0.4
0.4
0.5
0.5
0.4
0.5
0.5
0.6
0.6
0.6
0.3
0.3
0.3
0.7
0.7
0.7
0.8
1
0.9
0.7
1
0.9
0.2
0.5
0.4
<0.1
0.4
<0.1
0.3
0.3
0.3
0.5
1.5
1
0.6
0.6
0.6
0.4
0.9
0.7
0.3
0.8
0.6
0.3
1
0.7
Experience shows that pH at this level is not
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 21
Health related variables
North West
E. coli
Samples with
>0 cfu/100mL
Locality
Samples Taken
Broome
Burrup LNG
Burrup Supply
Camballin
Cape Lambert TWS
Derby
Fitzroy Crossing
Halls Creek
Hedland
Karratha
Kununurra
Marble Bar
Newman
Nullagine
Onslow TWS
Point Samson
Roebourne
Wickham
Wyndham
72
13
12
12
12
48
12
47
72
72
48
11
62
11
49
12
50
50
48
(1) No samples required
Table 22
Thermophilic Naegleria
Max cfu/100mL
Requirement
Met
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
in this 12 month period
Samples Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
72
12
12
12
12
48
12
47
72
72
48
11
48
11
24
12
36
36
48
Samples with
Thermophilic
Naegleria
Fluoride
Metals
Concentration (mg/L)
Requirement
Met
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
Hydrocarbons
Samples Taken
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Min
52
1
1
2
2
52
2
3
9
54
2
2
2
2
2
2
4
4
2
Max
0.65
0.75
0.65
0.25
0.60
0.50
0.25
0.55
0.25
0.55
0.45
0.60
0.20
0.30
0.45
0.60
0.60
0.55
<0.1
Mean
0.80
0.75
0.65
0.30
0.80
0.65
0.25
0.60
0.40
0.80
0.55
0.65
0.50
0.40
0.50
0.80
0.80
0.80
<0.1
Samples Taken
0.72
0.75
0.65
0.28
0.70
0.59
0.25
0.57
0.37
0.68
0.50
0.63
0.35
0.35
0.48
0.70
0.70
0.69
<0.1
Guideline Met
1
1
1
1
0
1
2
1
2
0
1
1
0
1
1
0
0
0
0
ü
ü
ü
ü
(1)
ü
ü
ü
ü
(1)
ü
ü
(1)
ü
ü
(1)
(1)
(1)
(1)
Samples Taken
2
1
1
2
1
2
2
2
4
1
2
2
2
2
5
1
2
2
2
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Health related variables
North West
Nitrate
Pesticides
Radiological
Trihalomethanes
Concentration (mg/L)
Locality
Samples Taken
Broome
Burrup LNG
Burrup Supply
Camballin
Cape Lambert TWS
Derby
Fitzroy Crossing
Halls Creek
Hedland
Karratha
Kununurra
Marble Bar
Newman
Nullagine
Onslow TWS
Point Samson
Roebourne
Wickham
Wyndham
2
4.5
5.8
5.2
1
0.9
0.9
0.9
1
0.8
0.8
0.8
2
<0.05
<0.05
<0.05
2
<0.05
1.7
0.9
2
<0.05
<0.05
<0.05
2
0.7
0.8
0.8
3
0.5
1.3
1
4
0.6
0.9
0.8
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
4
1.1
1.5
1.4
2
0.4
1
0.7
4
0.2
1
0.6
2
0.3
0.3
0.3
2
<0.05
1.7
0.9
2
<0.05
<0.05
<0.05
2
<0.05
<0.05
<0.05
2
0.1
0.1
0.1
(1) No samples required in this 12 month period
Min
Max
Other Health Related
Concentration (mg/L)
Mean
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
1
0
0
1
0
1
4
1
2
1
4
1
1
1
1
1
1
1
1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
0
1
0
0
0
0
0
2
0
0
0
1
0
0
0
0
0
0
Guideline Met
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
Samples Taken
2
4
5
2
4
2
2
2
4
4
2
2
2
2
2
4
4
4
4
Min
<0.001
<0.001
<0.001
<0.001
0.017
<0.001
<0.001
0.002
<0.001
0.002
0.010
0.004
0.002
0.003
<0.001
0.081
0.010
0.008
0.048
Max
<0.001
0.100
0.077
0.002
0.110
0.003
<0.001
0.003
0.004
0.110
0.014
0.005
0.005
0.016
0.001
0.150
0.081
0.110
0.084
Mean
<0.001
0.066
0.046
<0.001
0.071
0.002
<0.001
0.003
0.002
0.062
0.012
0.005
0.004
0.010
<0.001
0.118
0.059
0.077
0.071
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
0
0
0
0
0
0
0
0
2
0
0
0
0
0
0
0
0
0
0
Requirement
Met
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
ü
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
Drinking Water Quality Annual Report Data 01/07/2011 to 30/06/2012
Table 23
Aesthetic (Non-health related) Variables
North West
Aluminium
Hardness
Iron
Manganese
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Concentration (mg/L)
Locality
Samples Taken
Broome
Burrup LNG
Burrup Supply
Camballin
Cape Lambert TWS
Derby
Fitzroy Crossing
Halls Creek
Hedland
Karratha
Kununurra
Marble Bar
Newman
Nullagine
Onslow TWS
Point Samson
Roebourne
Wickham
Wyndham
2
<0.008
<0.008
<0.008
1
0.010
0.010
0.010
1
0.010
0.010
0.010
2
<0.008
<0.008
<0.008
2
0.010
0.018
0.014
2
<0.008
<0.008
<0.008
2
<0.008
<0.008
<0.008
3
<0.008
<0.008
<0.008
4
<0.008
<0.008
<0.008
2
0.014
0.016
0.015
2
<0.008
<0.008
<0.008
4
<0.008
<0.008
<0.008
2
<0.008
<0.008
<0.008
4
<0.008
<0.008
<0.008
2
<0.008
<0.008
<0.008
2
0.008
0.025
0.017
2
0.014
0.018
0.016
2
0.020
0.040
0.030
2
0.012
0.045
0.029
(1) Elevated hardness is characteristic of the souce supplying this
Min
Table 24
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
ü
2
65
70
68
ü
ü
1
260
260
260
(1)
ü
1
250
250
250
(1)
ü
2
45
45
45
ü
ü
2
130
390
260
(2)
ü
2
15
15
15
ü
ü
2
160
170
165
ü
ü
3
270
310
288
(1)
ü
4
200
230
218
(1)
ü
2
120
140
130
ü
ü
2
160
170
165
ü
ü
4
300
370
330
(1)
ü
2
250
370
310
(1)
ü
4
150
220
183
(1)
ü
2
180
190
185
ü
ü
2
120
390
255
(2)
ü
2
120
130
125
ü
ü
2
130
130
130
ü
ü
2
30
35
33
ü
locality (2) Elevated harness is a characteristic of the source supplying this locality
Min
Max
Mean
2
<0.003
0.004
1
<0.003
<0.003
1
<0.003
<0.003
2
0.015
0.020
2
<0.003
0.015
2
0.004
0.006
2
<0.003
0.004
3
<0.003
0.004
4
<0.003
<0.003
2
<0.003
<0.003
2
<0.003
<0.003
4
<0.003
0.004
2
<0.003
<0.003
4
<0.003
0.004
2
<0.003
<0.003
2
0.004
0.015
2
<0.003
<0.003
2
0.015
0.035
2
<0.003
<0.003
for part of the year (Millstream).
<0.003
<0.003
<0.003
0.018
0.008
0.005
<0.003
<0.003
<0.003
<0.003
<0.003
<0.003
<0.003
<0.003
<0.003
0.010
<0.003
0.025
<0.003
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Samples Taken
2
1
1
2
2
2
2
3
4
2
2
4
2
4
2
2
2
2
2
Min
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.003
<0.002
Max
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.003
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
Mean
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
<0.002
0.004
<0.002
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Aesthetic (Non-health related) Variables
North West
pH
TDS
True Colour
Value (pH units)
Concentration (mg/L)
Value (TCU)
Locality
Samples Taken
Broome
Burrup LNG
Burrup Supply
Camballin
Cape Lambert TWS
Derby
Fitzroy Crossing
Halls Creek
Hedland
Karratha
Kununurra
Marble Bar
Newman
Nullagine
Onslow TWS
Point Samson
Roebourne
Wickham
Wyndham
2
6.41
6.55
6.48
(1)
2
362
368
365
ü
2
<1
1
8.02
8.02
8.02
ü
1
618
618
618
(2)
1
<1
1
8.03
8.03
8.03
ü
1
604
604
604
(2)
1
<1
2
6.84
7.20
7.02
ü
2
228
235
232
ü
2
<1
2
7.60
8.16
7.88
ü
2
312
878
595
ü
2
<1
2
7.83
7.98
7.91
ü
2
421
422
422
ü
2
<1
2
7.54
7.80
7.67
ü
2
365
377
371
ü
2
<1
3
7.81
8.02
7.88
ü
3
892
1104
982
(2)
3
<1
4
7.91
7.98
7.94
ü
4
597
638
619
(2)
4
<1
2
8.02
8.06
8.04
ü
2
319
335
327
ü
2
<1
2
7.63
7.76
7.70
ü
2
424
443
434
ü
2
<1
4
7.49
7.66
7.57
ü
4
1056
1107
1088
(2)
4
<1
2
7.51
8.04
7.78
ü
2
583
768
676
(2)
2
<1
4
7.19
7.70
7.47
ü
4
463
630
548
ü
4
<1
2
8.00
8.08
8.04
ü
2
417
421
419
ü
2
<1
2
8.13
8.15
8.14
ü
2
325
880
603
(3)
2
<1
2
7.90
7.99
7.95
ü
2
319
325
322
ü
2
<1
2
7.67
8.02
7.85
ü
2
333
352
343
ü
2
<1
2
7.78
8.42
8.10
ü
2
114
121
118
ü
2
<1
(1) Low pH is characteristic of the source supplying this locality. (2) Elevated TDS is a characteristic of the source supplying this locality. (3) Elevated TDS is a characteristic of
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Mean
Guideline Met
Samples Taken
Min
Max
Turbidity
Value (NTU)
Mean
Guideline Met
Samples Taken
Min
<1
<1
ü
2
<1
<1
ü
1
<1
<1
ü
1
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
3
<1
<1
ü
4
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
4
<1
<1
ü
2
<1
<1
ü
4
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
2
<1
<1
ü
2
the source supplying this locality for part of the year
Max
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.1
<0.1
(Millstream).
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.3
<0.1
<0.1
<0.1
0.2
<0.1
<0.1
<0.1
0.2
0.2
0.2
<0.1
Mean
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
<0.1
0.2
<0.1
Guideline Met
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü