YARRA
VALLEY
QUALITY
WATER
DRINKING WATER QUALITY REPORT
2014/15
TABLE OF
CONTENTS
1
Glossary Of Terms
3
2
Executive Summary
4
3
Introduction
6
About Yarra Valley Water
6
TABLE 3 – sources and
treatment (Continued)
Figure 2 – Catchment to Tap
Schematic of Yarra Valley
Water Service Area
15
Disinfection
16
Fluoridation
16
Customer Feedback
17
Safe Drinking Water Act 2003 6
Water Quality Issues
17
Safe Drinking Water
Regulations 2005
Table 4 – Historical Water
Quality Complaints
18
Drinking Water Quality Policy 6
Drinking Water Regulatory
Framework
4
9
14
6
7
Australian Drinking Water
Guidelines 2011
7
Community Information
7
Figure 1 – Water Quality and
Sources of Supply
8
Drinking Water Supply System 9
Overview of Our Drinking
Water Supply System
9
Sources of Water
9
Water Filtration Plants
9
Table 1 – Water Sampling
Localities
6 Water Quality Test Results
2014/15
Monitoring Program
10
13
Yarra Valley Water | Drinking Water Quality Report 2014/15
19
19
Water Quality Compliance
Parameters – Results
20
Water Quality Compliance
Parameters – Three-Year Trend
20
Aesthetic and Health Related
Water Quality Parameters –
Results 21
7
Table 2 – Water Sampling
Localities and Corresponding
Suburbs
10
Table 3 – Sources and
Treatment
5
Regulated Water
8 Emergency and Incident
Management
Risk Management Plan Audit 25
10 Drinking Water Haccp Audit
25
11 Drinking Water Projects
26
New Mains Cleaning
Technology
26
Network model to predict
water quality
26
Chum Creek Reservoir
Upgrade
26
Particle Dispersion Devices
Appendices
26
28
APPENDIX 1
29
Results of Parameters Specified in
Regulations
29
APPENDIX 2
36
Results of Other Parameters
36
APPENDIX 3
45
Trends Over Localities and Time 45
APPENDIX 4
47
Sampling Frequency Variation
Gazette G22-29 May 2014
47
22
23
Incidents and Potential Water
Quality Events
23
Emergencies and Water
Quality Events
23
2
1
GLOSSARY
OF TERMS
The Act
Safe Drinking Water Act 2003 (Vic)
CAAs
Chloroacetic acids
Coliforms
Bacteria widely distributed throughout the environment
which provide a sensitive measure of microbiological
quality.
DHHS
Victorian Department of Health and Human Services
(the body charged with regulating water quality in
Victoria)
DHS
Victorian Department of Human Services (until 2009
the body charged with regulating water quality in
Victoria)
DELWP
Department of Environment, Land, Water and Planning
ESC
Essential Services Commission
E. coli
Escherichia coli bacteria
The Guidelines
Australian Drinking Water Guidelines 2011
HACCP
Hazard Analysis and Critical Control Points
The Regulations
Safe Drinking Water Regulations 2005 (New Drinking
Water Regulations 2015 are effective from 18 July
2015)
NATA
National Association of Testing Authorities
NTU
Nephelometric turbidity units
PolyDADMAC
Polydiallyldimethylammonium chloride
PVA
Polyvinyl alcohol
THMs
Trihalomethanes
UV disinfection
Ultraviolet disinfection
Water ‘hardness’
Refers to the concentration of calcium and magnesium
salts in water, which can attach to surfaces and cause
a hard, flaky scale. These salts can also make it difficult
to achieve lather when using soap.
Water sampling
locality
An area that has common water quality characteristics
because the supply is provided through specific pipes,
tanks or pumps. It is more likely to follow geographic
features than suburb boundaries.
Yarra Valley Water | Drinking Water Quality Report 2014/15
3
2
EXECUTIVE SUMMARY
Welcome to Yarra Valley Water’s
Drinking Water Quality Annual Report
2014/15, which summarises the
results of our water quality testing
program and confirms the safety and
high standard of your drinking water.
Yarra Valley Water is committed to
supplying high-quality, safe and
pleasant-tasting drinking water to our
customers. We are also committed to
world’s best practice management of
drinking water supply and to
undertaking rigorous monitoring in
accordance with the Safe Drinking
Water Regulations 2005 and the
Australian Drinking Water Guidelines
2011.
Feedback from our Customer Insights
Research Program highlighted that
customers consistently reported high
levels of satisfaction with the quality
of their drinking water. This program
helps identify customer needs and
assists us in delivering exemplary
services.
During 2014/15, we received 2.6
water quality complaints for every
1,000 customers which is a 30%
reduction compared with 2013/14.
This is the lowest ever level of water
quality complaints recorded in the
history of Yarra Valley Water. A
combination of factors have
contributed to this outcome,
including;
 improved management of system
operational changes;
 cleaning of water mains by ice
pigging; and
 lower than average flow rates in
water mains during summer months
preventing sediment re-suspension.
We also achieved 93% customer
satisfaction with the overall quality of
drinking water, representing an
increase of 4% from the previous
year
In 2014/15, we tested more than
6,600 samples for microbiological
contamination. We complied with the
Safe Drinking Water Regulations
2005 requirement that 98% of
samples (in each water sampling
locality) are free from E. coli.
Yarra Valley Water uses a quality
system known as HACCP (Hazard
Analysis and Critical Control Points)
to ensure water quality is not
compromised. An independent
surveillance audit in February 2015
confirmed that Yarra Valley Water
successfully met all HACCP
requirements.
Providing safe and pleasant drinking
water is a key priority for YVW. We
will continue to play our part in
ensuring Melbourne retains its
enviable reputation for supplying
some of the best drinking water in the
world.
In 2014/15, we conducted a total
of 22,141 water tests either weekly,
fortnightly or monthly in accordance
with the Safe Drinking Water
Regulations 2005 and the Australian
Drinking Water Guidelines 2011.
exceeded the aluminium standard
outlined in the Safe Water
Regulations 2005. The high
aluminium result, detected in Yarra
Glen, was caused by a fault at
Melbourne Water’s Yarra Glen
Treatment Plant. The fault was
promptly rectified and all subsequent
sample results confirmed that
aluminium levels were below the
water quality standard. The
aluminium standard and the guideline
value in the Australian Drinking Water
Guidelines (ADWG) are based on
aesthetic considerations and the
detected amount posed no threat to
human health.
Historically, we have supplied our
customers with water sourced from
both protected and unprotected
catchments. About 30% of customers
receive water sourced from
unprotected catchments, which is
filtered and disinfected by Melbourne
Water at its water filtration plants.
The other 70% of customers receive
water sourced from protected
catchments, which is disinfected but
unfiltered.
We are constantly looking for better
ways to provide safe and pleasant
drinking water to our customers. In
the last 12 months, we have
continued cleaning the water mains in
areas where there is a history of
water quality enquiries, complaints
and or high levels of coliforms using
an innovative technology called ‘ice
pigging’.
In 2014/15 there was one instance of
a non-routine water sample that
Yarra Valley Water | Drinking Water Quality Report 2014/15
4
Ice pigging is more effective at
removing sediments from water
mains than our traditional method of
flushing and uses significantly less
water.
Our analysis to date indicates that ice
pigging has been effective in
reducing customer complaints and
associated analysis of sediment
accumulation indicates that the
frequency between cleans can be
extended by up to three years.
We have completed refurbishing the
Chum Creek Reservoir north of
Healesville. Works included roof
replacement and repairs to the
internal and external concrete walls.
We have also taken the opportunity
to make a number of site
improvements to address identified
staff safety hazards.
continually improving this aspect of
our service.
Results of our water quality
monitoring are reported to the
Department of Health and Human
Services on a monthly basis and the
Essential Services Commission on a
quarterly and annual basis. Our
results are also published on our
website
www.yvw.com.au/waterqualityresults.
Pat McCafferty
Managing Director
In the Ridge-Monbulk locality, we
have commenced a project aimed at
improving disinfection residuals
throughout the network. Continuous
monitoring of water quality indicators
across the network will be used to
calibrate computerised hydraulic
models of the network and plan any
intervention works that may be
required.
During the year, we continued to
implement our Particle Dispersion
Device (PDD) program which, since
its inception in 2005, has resulted in
an 88% reduction in water quality
complaints in dead-end water mains
with a PDD installed.
Yarra Valley Water together with the
rest of the Victorian water sector also
worked with Department of Health
and Human Services on the
development of the 2015 Safe
Drinking Water Regulations.
We recognise that drinking water
quality is, and will always be, a key
driver of customer satisfaction and
we have a strong commitment to
Yarra Valley Water | Drinking Water Quality Report 2014/15
5
3
INTRODUCTION
ABOUT YARRA
VALLEY WATER
Yarra Valley Water supplies water
to almost 1.8 million people over a
licence area covering just over 4,000
square kilometres, through a complex
network of distribution water mains,
reservoirs, pump stations and
reticulation pipes. We are
Melbourne’s largest retail water
organisation and in 2014/15, supplied
just under 133 billion litres of water to
our customers.
The majority of Yarra Valley Water’s
supply is harvested from the
protected catchments of the
Maroondah, Upper Yarra and
Thomson reservoirs. The remaining
supply is sourced from Sugarloaf
Reservoir.
We own and operate:
• 9,708 kilometres of water supply
mains;
• 52 water supply tanks;
• 75 water pumping stations; and
• 137 water pressure reducing
stations.
As part of Yarra Valley Water’s
commitment to delivering safe and
high-quality water to customers, we
have an accredited Hazard Analysis
and Critical Control Points (HACCP)
Plan which constitutes our Risk
Management Plan. It is also
integrated with our corporate-wide
quality management systems.
HACCP is an international system for
process control used by the food
industry to ensure a safe product and
Yarra Valley Water | Drinking Water Quality Report 2014/15
this is our fourteenth year using
HACCP.
The HAACP Plan is continuously
reviewed, audited and improved.
This report provides:
• A statement of our Drinking Water
Quality Policy;
• An overview of our drinking water
supply system;
• Details of the sources of supply
for each water sampling locality;
• A summary of water treatment
and disinfection processes;
• Water quality test results;
• Details of our water quality risk
management program;
• Details of water quality
improvement initiatives;
• Customer feedback; and
• Research and development
initiatives.
DRINKING WATER
QUALITY POLICY
Yarra Valley Water is committed to
supplying drinking water that is safe,
pleasant to drink and meets our
customers’ expectations.
To do this we:
• Manage the water supply system
to ensure its integrity and
performance, and monitor the
quality of water supply;
• Ensure that our customers and
other stakeholders have access to
the results of our water quality
monitoring;
• Strive to exceed standards set by
independent regulators;
• Implement effective risk
management and emergency
response systems;
• Regularly seek the views of
customers and incorporate their
feedback into improvement
programs;
• Liaise closely with water quality
and health regulators; and
• Ensure staff and business partners
involved in the supply of drinking
water are well-trained and
understand their responsibility for
contributing to the objectives of the
policy.
DRINKING WATER
REGULATORY
FRAMEWORK
Safe Drinking Water Act
2003
The purpose of the Victorian Safe
Drinking Water Act 2003 (‘the Act’) is:
‘To make provision for the supply of
safe drinking water.’
The Act is administered by the
Victorian Department of Health and
Human Services (previously
‘Department of Health’) after powers
were transferred from the Victorian
Department of Human Services
in late 2009.
Under the Act, Yarra Valley Water
is classified as a ‘(drinking) water
supplier’ and must meet all
requirements specified in the Act.
6
The Act defines ‘drinking water’ as:
‘Water that is intended for human
consumption or for purposes
connected with human consumption
such as the preparation of food or the
making of ice for consumption or for
the preservation of unpackaged food,
whether or not the water is used for
other purposes.’
community the Safe Drinking Water
Regulations 2005 have a 10 year
review and sunset clause. This
resulted in the new Safe Drinking
Water Regulations 2015, coming into
effect from 18 July 2015.
Safe Drinking Water
Regulations 2005
The purpose of the Australian
Drinking Water Guidelines 2011
(‘the Guidelines’) is to: ‘… provide the
authoritative Australian reference for
use within Australia’s administrative
and legislative framework to ensure
the accountability of drinking water
suppliers … The Guidelines are not,
however mandatory legally
enforceable standards.’
The Victorian Safe Drinking Water
Regulations 2005 (‘the Regulations’)
are made under section 56 of the Act.
The objective of the Regulations is to
make further provision for the supply
of safe drinking water.
The Regulations set out details for
the management of the supply of safe
drinking water, which includes the
following:
a. Matters to be included in the Risk
Management Plan.
b. Drinking water quality standards.
c. Requirements relating to the
frequency of collection of samples
of water for analysis.
d. Details to be included in an annual
report to the Secretary.
As is the case with the Act, the
Regulations are administered by the
Department of Health and Human
Services, and Yarra Valley Water
must meet all requirements specified.
The drinking water quality standards
outlined in the Regulations are set to
protect public health.
To ensure the regulations continue to
improve the level of protection to the
Yarra Valley Water | Drinking Water Quality Report 2014/15
Australian Drinking Water
Guidelines 2011
The Guidelines set the framework
for management of drinking water
quality, known as the ‘12 elements’.
Yarra Valley Water has adopted the
12 elements approach in managing
our drinking water system.
The 12 elements comprise:
1. Commitment to drinking water
quality management (by the
organisation)
2. Assessment of the drinking water
supply system
3. Preventative measures for
drinking water quality
management
4. Having operational procedures
and process control in place
5. Verification of drinking water
quality
6. Management of incidents and
emergencies
7. Community involvement and
awareness
Research and development.
9. Documentation and reporting.
10. Evaluation and audit.
11. Review and continual
improvement.
8.
The Guidelines also provide
definitions for two sets of guideline
values:
Health-related guideline value
The concentration or measure of a
water quality characteristic that,
based on present knowledge, does
not result in any significant risk to the
health of the consumer over a lifetime
of consumption.
Aesthetic guideline value
The concentration or measure of a
water quality characteristic that is
associated with the acceptability
of water to the consumer, e.g.
appearance, taste and odour.
COMMUNITY
INFORMATION
Consistent with the Safe Drinking
Water Act 2003, section 23, Yarra
Valley Water provides its customers
with all available information about
the quality of its drinking water.
We conduct weekly, fortnightly and
monthly sampling of our drinking
water, which is published on our
website www.yvw.com.au as results
are available.
This Drinking Water Quality Report is
produced every year and is available
to all customers through our website
or by request from our Customer
Contact Centre on 1300 304 688.
7
FIGURE 1 – WATER QUALITY AND SOURCES OF SUPPLY
Yarra Valley Water | Drinking Water Quality Report 2014/15
8
4
DRINKING WATER SUPPLY
SYSTEM
OVERVIEW OF OUR
DRINKING WATER
SUPPLY SYSTEM
Melbourne’s water is amongst the
safest and most pleasant-tasting in
the world. The majority of our water
is drawn from large protected
mountain catchments where no
agricultural or human activity is
allowed - hence, the water has a low
risk of contamination. Water is then
stored in large reservoirs for up to
four years, where naturally occurring
sediments are allowed to settle out of
the water. This means most of
Melbourne’s water needs little
treatment compared to other
developed cities.
Approximately 30% of our water
comes from the unprotected
catchments of the Yan Yean and
Sugarloaf reservoirs. This water is
filtered to meet health and quality
standards as outlined in the Safe
Drinking Water Regulations 2005.
Yarra Valley Water | Drinking Water Quality Report 2014/15
Melbourne Water manages all of
Melbourne’s metropolitan water
catchments, including the land in
the catchments, the reservoirs, and
operation of water treatment plants.
Yarra Valley Water’s supply area
consists of 32 unique water sampling
localities shown in Table 1 (page 10)
and Figure 1 (page 8). A water
sampling locality is an area that has
common water quality characteristics.
A list that correlates localities to
suburbs is provided in Table 2 (page
10), and the performance of these
localities for water quality is
presented in Section 6 of this report
(see page 19).
Yarra Valley Water now supplies
approximately 55% of its customers
with water from the Sugarloaf
Reservoir (through the Winneke
Treatment Plant) at some point
during the year. At other times,
customers also receive water
supplied from the protected
catchments of the Upper Yarra
and Thomson reservoirs.
SOURCES OF WATER
Sources of supply for each water
sampling locality are shown in Table
3 (on page 13). Figure 2 (on page 15)
shows our water supply system from
the catchment to the tap.
WATER FILTRATION
PLANTS
Melbourne Water is responsible for
the management of the water
filtration plants that supply water to
Yarra Valley Water customers. Water
filtration plants are used to treat water
from some unprotected water
catchments, removing sediment and
harmful micro-organisms.
There are two main water filtration
plants operated by Melbourne Water:
Winneke and Yan Yean, as well as
smaller filtration plants supplying
water to Healesville and Yarra Glen.
9
TABLE 1 – WATER SAMPLING LOCALITIES
Water Sampling
Locality
Locality
Number
Population
Brahams Road
74
133
Bundoora
14
Croydon
Doncaster
TABLE 2 – WATER SAMPLING LOCALITIES AND
CORRESPONDING SUBURBS
Suburb
Postcode
Water Sampling
Locality
133,436
Alphington
3078
10
51
143,267
Armadale
3143
61
50
95,542
Arthurs Creek
3099
19
3147
61
Eltham
25
22,818
Ashburton
Emerald
46
18,173
Ashwood
3147
52, 61
Epping
17
101,476
Attwood
3049
7, 12
Glen Waverley
60
139,328
Avonsleigh
3782
46
Glenroy
07
107,303
Badger Creek
3777
22
Healesville
22
10,132
Balwyn
3103
52, 53
Ivanhoe
55
23,767
Balwyn North
3104
52, 53
3153
51, 56
Kew
53
158,601
Bayswater North
Lilydale
48
43,106
Belgrave South
3160
46
Lower Plenty
16
17,063
Bellfield
3081
9, 55
Lyrebird Avenue
73
763
Beveridge
3753
12
Malvern
61
94,902
Blackburn
3130
50, 51, 52
Mernda/Hurstbridge
19
33,220
Blackburn North
3130
50, 52
3130
52
Mitcham
52
121,575
Blackburn South
Montrose
56
16,458
Box Hill
3128
52
Northcote
10
120,317
Box Hill North
3129
52
Plenty
18
38,506
Box Hill South
3128
52
Preston
09
137,391
Briar Hill
3088
18
Ridge/Monbulk
47
19,055
Broadmeadows
3047
7, 12
Seville
24
6,307
Brunswick
3056
10
3057
10
Somerton
12
118,373
Brunswick East
Wallan
71
10,955
Brunswick West
3055
10
Warburton
21
3,838
Bulleen
3105
50, 53
Warranwood
49
53,117
Bundoora
3083
9, 14
Whittlesea
20
6,041
Burwood
3125
52, 53, 61
Woori Yallock
26
6,236
Burwood East
3151
52, 60
3124
53
Yarra Glen
23
3,281
Camberwell
Yarra Junction
72
3,673
Campbellfield
3061
7, 12, 14
Canterbury
3126
53
Chadstone
3148
61
Chirnside Park
3116
48, 49, 51
Chum Creek
3777
22
Clayton
3168
60
Clematis
3782
46
Coburg
3058
9, 10
Coburg North
3058
7, 9, 14
Cockatoo
3781
46
Coldstream
3770
48
Coolaroo
3048
7, 12
Locality numbers have a unique identifier across Melbourne.
Yarra Valley Water | Drinking Water Quality Report 2014/15
10
TABLE 2 – WATER SAMPLING LOCALITIES AND
CORRESPONDING SUBURBS
TABLE 2 – WATER SAMPLING LOCALITIES AND
CORRESPONDING SUBURBS
Suburb
Postcode
Water Sampling
Locality
Suburb
Postcode
Water Sampling
Locality
Cottles Bridge
3099
19
Ivanhoe
3079
9, 55
Craigieburn
3064
12
Ivanhoe East
3079
55
Croydon
3136
49, 51
Jacana
3047
7
Croydon Hills
3136
49
Kalkallo
3064
12
Croydon North
3136
49, 51
Kallista
3791
46, 47
Croydon South
3136
51
Kalorama
3766
47, 56
Dallas
3047
12
Kangaroo Ground
3097
19, 25, 49
Diamond Creek
3089
18, 19, 25
Kew
3101
10, 53
Don Valley
3139
26,
Kew East
3102
53
Doncaster
3108
50, 53
Kilsyth
3137
51, 56
Doncaster East
3109
50
Kilsyth South
3137
56
Donvale
3111
49, 50, 51
Kingsbury
3083
9
Doreen
3754
19
Kooyong
3144
61
Eaglemont
3084
9,55
Lalor
3075
14, 17
East Warburton
3799
73, 74
Launching Place
3139
26, 72
Eltham
3095
16, 18, 25, 49
Lilydale
3140
48, 51
Eltham North
3095
18
Lower Plenty
3093
16
Emerald
3782
46
Macclesfield
3782
46
Epping
3076
17
Macleod
3085
9, 14
Fairfield
3078
10
Malvern
3144
61
Fawkner
3060
7
Malvern East
3145
61
Ferny Creek
3786
47
Meadow Heights
3048
7, 12
Fitzroy North
3068
10
Menzies Creek
3151
46
Forest Hill
3131
51, 52, 60
Mernda
3754
17
Gembrook
3783
46
Mickleham
3064
12
Gladstone Park
3043
7
Mill Park
3082
14, 17
Glen Iris
3146
53, 61
Millgrove
3799
21
Glen Waverley
3150
52, 60
Mitcham
3132
50, 51
Glenroy
3046
7
Monbulk
3793
46, 47
Gowanbrae
3043
7
Mont Albert
3127
52, 53
Greensborough
3088
14, 16, 18
Mont Albert North
3129
52, 53
Greenvale
3051
12
Montmorency
3094
16, 18
Gruyere
3770
24, 48
Montrose
3765
47, 48, 51, 56
Hadfield
3046
7
Mooroolbark
3138
48, 51, 56
Hawthorn
3122
53
Mt Evelyn
3796
24, 47, 48, 51
Hawthorn East
3123
53
Mt Dandenong
3767
56, 47
Healesville
3777
22
Mt Waverley
3149
52, 60, 61
Heathmont
3135
51
Mulgrave
3170
60
Heidelberg
3084
9, 55
North Warrandyte
3113
49
Heidelberg Heights
3081
9
Northcote
3070
10
Heidelberg West
3081
9, 55
Notting Hill
3168
60
Hurstbridge
3099
19
Nunawading
3131
50, 51, 52
Yarra Valley Water | Drinking Water Quality Report 2014/15
11
TABLE 2 – WATER SAMPLING LOCALITIES AND
CORRESPONDING SUBURBS
TABLE 2 – WATER SAMPLING LOCALITIES AND
CORRESPONDING SUBURBS
Suburb
Postcode
Water Sampling
Locality
Suburb
Postcode
Water Sampling
Locality
Nutfield
3099
19
Thornbury
3071
9, 10
Oak Park
3046
7
Toorak
3142
61
Oaklands Junction
3063
12
Tremont
3785
47
Oakleigh
3166
60, 61
Tullamarine
3043
7
Oakleigh East
3166
60
Upwey
3158
47
Olinda
3788
47
Vermont
3133
51
Panton Hill
3751
19
Vermont South
3133
51, 52, 60
Park Orchards
3114
49, 50
Viewbank
3084
9,16
Pascoe Vale
3044
7, 9
Wallan
3756
12, 71
Pascoe Vale South
3044
9, 10
Wandin East
3139
24, 47
Plenty
3090
18, 19
Wandin North
3139
24, 48
Preston
3072
9
Warburton
3799
21
Research
3095
19, 25, 49
Warrandyte
3113
49, 50
Reservoir
3073
9, 14
Warrandyte South
3134
49
Ringwood
3134
49, 51
Warranwood
3134
49
Ringwood East
3135
51
Watsonia
3087
14
Ringwood North
3134
49
Watsonia North
3087
14
Rosanna
3084
9, 55
Wattle Glen
3096
19, 25
Roxburgh Park
3064
12
Wesburn
3799
72
Sassafras
3787
47
Westmeadows
3049
7
Seville
3139
24
Wheelers Hill
3150
60
Seville East
3139
24
Whittlesea
3757
20
Sherbrooke
3789
47
Wollert
3750
17
Silvan
3795
24, 47
Wonga Park
3115
49, 51
Smiths Gully
3760
19
Woodstock
3751
20
Somerton
3062
12
Woori Yallock
3139
26
South Morang
3752
17
Yallambie
3085
9, 14, 16
St Helena
3088
18
Yan Yean
3755
19, 20
Surrey Hills
3127
52, 53
Yarra Glen
3775
23
Templestowe
3106
50
Yarra Junction
3797
72
Templestowe Lower
3107
50, 53
Yarrambat
3091
19
The Patch
3792
46, 47
Yellingbo
3139
26
Thomastown
3074
14
Yering
3770
23, 48
Yarra Valley Water | Drinking Water Quality Report 2014/15
12
TABLE 3 – SOURCES AND TREATMENT
Locality Supplied
Source Water/
Catchment
Storage
Treatment Plant
Treatment Process
Added Substances
Glen Waverley (60),
Malvern (61)
Transfer from Silvan
Reservoir without being
treated at Silvan water
treatment plant
Cardinia
Reservoir
Cardinia
Chlorination
(disinfection)
Chlorine (gas)
Fluoridation
Fluorosilicic acid
pH correction
Lime
Secondary chlorination
Sodium hypochlorite
Secondary pH correction
Carbon dioxide
Chlorination
(disinfection)
Chlorine (gas)
Secondary chlorination
Sodium hypochlorite
Coagulation
Aluminium
chlorohydrate
Membrane filtration
Membrane cleaning:
Hydrex 4709
Citric acid
Hydrogen peroxide
pH correction
Sodium hydroxide
Chlorination
(disinfection)
Secondary disinfection
Sodium hypochlorite
Coagulation
Aluminium
chlorohydrate
Membrane filtration
Membrane cleaning:
Hydrex 4709
Citric acid
Hydrogen peroxide
pH correction
Sodium carbonate
Chlorination
(disinfection)
Sodium hypochlorite
Chlorination
(disinfection)
Chlorine (gas)
Fluoridation
Fluorosilicic acid
pH correction
Lime
Secondary chlorination
Sodium hypochlorite
Glenroy (07),
Somerton (12)
Yarra Glen (23)
Healesville (22)
Croydon (51), Doncaster
(50), Glen Waverley (60),
Lilydale (48), Montrose
(56), Malvern (61),
Mitcham (52), Somerton
(12), Warranwood (49),
Wallan (71), Northcote
(10), Preston (09), Kew
(53), Ivanhoe (55),
Bundoora (14), Lower
Plenty (16), Glenroy (07),
Seville (24)
Transfer from Silvan
Reservoir following
treatment process at
Silvan or from Winneke
water treatment plant –
See Silvan and Winneke
water supply systems
Greenvale
Reservoir
Maroondah Catchment
Maroondah
Reservoir
Coranderrk & Graceburn
Catchment
Thomson Catchment
Upper Yarra Catchment
O’Shannassy Catchment
Armstrong Catchment
McMahons Catchment
Starvation Catchment
Coranderrk Catchment
Yarra Valley Water | Drinking Water Quality Report 2014/15
Maroondah
Reservoir
Silvan
Reservoir
Greenvale
Yarra Glen
Frogley
Creswell
Silvan
Sodium hypochlorite
13
TABLE 3 – SOURCES AND TREATMENT (CONTINUED)
Locality Supplied
Source Water/Catchment
Storage
Treatment Plant
Treatment Process
Added Substances
Ridge/Monbulk (47)
Thomson Catchment
Upper Yarra Catchment
O’Shannassy Catchment
Armstrong Catchment
Silvan
Reservoir
Monbulk
Chloramination or
Chlorination (disinfection)
Chlorine (gas)
Ammonia (aqueous)
Fluoridation
Sodium fluoride
pH correction
Sodium hydroxide
Chloramination or
Chlorination (disinfection)
Chlorine (gas)
Ammonia (aqueous)
pH correction
Sodium hydroxide
Emerald (46)
Woori Yallock (26)
McMahons Catchment
Starvation Catchment
Coranderrk Catchment
Thomson Catchment
Upper Yarra Catchment
Kallista
Upper Yarra
Reservoir
Lusatia Park
Reservoir aeration
UV irradiation
Secondary chlorination
Yarra Junction (72)
Thomson Catchment
Upper Yarra Catchment
Upper Yarra
Reservoir
Yarra Junction
Reservoir aeration
UV irradiation
Secondary chlorination
Lyrebird Avenue (73)
Thomson Catchment
Upper Yarra Catchment
Upper Yarra
Reservoir
Lyrebird Avenue
Thomson Catchment
Upper Yarra Catchment
Upper Yarra
Reservoir
UV irradiation
Martyr Road
Thomson Catchment
Upper Yarra Catchment
Upper Yarra
Reservoir
UV irradiation
Brahams Road
Plenty (18), Eltham (25),
Bundoora (14), Epping
(17), Mernda/Hurstbridge
(19), Whittlesea (20)
Transfer from
Maroondah Reservoir
Yarra River
Goulburn River
Sugarloaf
Reservoir
Sodium hypochlorite
Reservoir aeration
UV irradiation
Secondary chlorination
Plenty (18), Eltham (25),
Northcote (10), Preston
(09), Kew (53), Ivanhoe
(55), Bundoora (14),
Epping (17),
Mernda/Hurstbridge (19),
Whittlesea (20)
Sodium hypochlorite
Reservoir aeration
Secondary chlorination
Brahams Road (74)
Sodium hypochlorite
Reservoir aeration
Secondary chlorination
Warburton (21)
Sodium hypochlorite
Winneke
Sodium hypochlorite
Reservoir aeration
Coagulation/flocculation
Lime
Aluminium sulphate
Polyacrylamide
Clarification/filtration
Wallaby Creek
Catchment
Toorourrong Catchment
Yan Yean Catchment
Transfer from Silvan
Reservoir
Yan Yean
Reservoir*
Yan Yean
Chlorination (disinfection)
Chlorine
Fluoridation
Fluorosilicic acid
pH correction
Lime
Sludge
thickening/dewatering
Polyacrylamide
Secondary chlorination
Sodium hypochlorite
Reservoir aeration
Coagulation/flocculation
Aluminium sulphate
PolyDADMAC
Polyacrylamide
Filtration
Chlorination (disinfection)
Chlorine (gas)
Fluoridation
Fluorosilicic acid
pH correction
Lime
Carbon dioxide
Secondary chlorination
Sodium hypochlorite
Yan Yean Reservoir was offline for the duration of the reporting period.
Yarra Valley Water | Drinking Water Quality Report 2014/15
14
FIGURE 2 – CATCHMENT TO TAP SCHEMATIC OF YARRA VALLEY WATER SERVICE AREA
Protected Catchments
i.e. Thomson, Upper Yarra,
O’Shannassy, Maroondah, Silvan,
Cardinia reservoirs
Sources with variable quality and/or
unprotected catchments i.e. open
aqueducts, Yan Yean and Sugarloaf
reservoirs
Fluoridation at Silvan, Yan Yean, Cardinia
and Sugarloaf reservoirs
Yarra Valley Water | Drinking Water Quality Report 2014/15
15
DISINFECTION
Disinfection is the key process used
to ensure the safety of drinking water.
We use a range of globally adopted
disinfection methods including
chlorination, chloramination and
ultraviolet light. Table 3 (on page 13)
outlines the treatment processes
used for each locality.
The most effective disinfection
method depends on the quality of the
source water, the origin of the
contaminating micro-organisms, the
length of the system and the size of
the population served.
Chlorination
Chlorination is the process of adding
chlorine to the water to destroy any
bacteria that may cause illness.
specific area, other disinfection
methods, such as chloramination
and ultraviolet (UV) light are applied.
Chloramination
Chloramination is similar to
chlorination. The main difference
is the use of chloramines for
disinfection instead of chlorine.
Chloramines are slightly weaker than
chlorine, but their disinfection effect
lasts longer than chlorine. As such,
chloramines are typically used when
the water remains within the pipe
system for extended periods of time.
Ultraviolet Light
organisms in the water. There is no
chemical added in this process.
The use of UV lights for disinfection
is generally only suitable for smaller
closed pipe systems.
FLUORIDATION
To improve the dental health of
Victorians, the majority of Yarra
Valley Water’s supply source is
fluoridated according to Department
of Health and Human Services
requirements. Table 3 (on page 13)
outlines the localities that receive
fluoridated water.
Ultraviolet (UV) light involves the use
of UV rays to destroy micro-
The majority of water supplied to
Yarra Valley Water customers is
treated with chlorine as part of normal
treatment processes to ensure that it
is safe to drink, right up to the point
when it reaches the customer
property.
Where it is considered that
chlorination would not be the most
effective disinfection method in a
Yarra Valley Water | Drinking Water Quality Report 2014/15
16
5
CUSTOMER FEEDBACK
This section outlines typical water
quality issues encountered by our
customers, most of which relate to
appearance. It also discusses the
common causes for these issues and
how we manage them. The water
quality issues experienced by our
customers can be classified into three
categories: dirty (or discoloured)
water, blue water, and taste and
odour.
WATER QUALITY
ISSUES
Yarra Valley Water ensures our
customers experience minimal
discoloured water through regular
maintenance programs and frequent
monitoring of turbidity.
Blue Water
Blue water is an indication of copper
corrosion in household plumbing.
Copper is widely used in domestic
plumbing systems. Blue water is
usually accompanied by a metallic
taste. Copper corrosion can also
stain fittings blue.
Discoloured Water
Taste and Odour
Discoloured water is water that
contains naturally occurring
sediments. It is measured by turbidity
(discussed in section 6, page 20).
Discoloured water can originate from
household plumbing systems or the
Yarra Valley Water pipe system,
where naturally occurring sediments
may settle out at points due to the
unfiltered nature of much of
Melbourne’s supply. Discoloured
water is often experienced when
water taps are turned on after a long
period of not being used (e.g. after a
holiday). For the same reasons,
dead-end streets are prone to this
problem due to the low flow of water
through these pipes.
Taste and odour may be attributed
to chlorine, or the reaction of chlorine
with organic material or corroded
domestic plumbing.
Sediments from household plumbing
usually come from:
• Hot water services.
• Old, corroded, domestic galvanised
pipes.
• Defective plumbing, e.g. worn tap
washers or gaskets leaching rubber
particles into the water.
Yarra Valley Water | Drinking Water Quality Report 2014/15
Organic material in the water can
react with chlorine and cause a
‘chlorine-like’ taste in the water. The
presence of a ‘metallic’ or ‘bitter-salty’
taste, as well as generating a
distinctive odour in the water, is
generally an indication of possible
corrosion in household plumbing
systems.
To ensure the safety of drinking
water, it is necessary to provide a
residual of chlorine in our pipes. We
strive to keep this at around 0.2 mg/L
– a level that most people cannot
detect.
Operational changes such as
switching supply from one catchment
to another may also cause some
customers to experience a different
taste in their drinking water.
Yarra Valley Water Responses
All reports relating to drinking water
quality are recorded in Yarra Valley
Water’s systems. Our trained field
officers then take action to investigate
and resolve the issues. Cases are
only closed when the affected
customer is satisfied.
When a customer experiences the
same issue more than once over a
six-month period, a dedicated case
manager is assigned to that
customer. The case manager
updates the customer on the
progress of actions taken to resolve
the specific issues and provides a
clear point of contact for the customer
until the issues are resolved to their
satisfaction.
Through our Customer Insights
Research Program, Yarra Valley
Water gains meaningful insights into
customer needs, preferences and
values on a range of issues including
water quality. Research undertaken
this year again showed that for
customers, the core value that Yarra
Valley Water provides is clear,
drinkable, high quality water. It is
evident that we are delivering this
value with nine out of ten customers
agreeing that we provide great
drinking water. Furthermore,
customer satisfaction with the overall
quality of water continues to be very
high, with the most important aspects
of water quality (in order of
importance) being clarity, being safe
to drink, and smell.
17
TABLE 4 – HISTORICAL WATER QUALITY COMPLAINTS
Complaints
06/07
07/08
08/09
09/10
10/11
11/12
12/13
13/14
14/15
Discoloured water
2595
2938
1969
2461
1868
1970
2543
2123
1516
Complaints per 100 customer connections
0.40
0.45
0.29
0.36
0.27
0.28
0.35
0.29
0.20
Taste and odour
390
438
280
549
283
440
322
400
215
Complaints per 100 customer connections
0.06
0.07
0.04
0.08
0.04
0.06
0.04
0.05
0.03
Blue water
40
30
14
60
27
23
29
31
16
Complaints per 100 customer connections
0.01
0
0
0.01
0.00
0.00
0.00
0.00
0.00
Air in water
209
186
192
163
83
60
77
77
92
Complaints per 100 customer connections
0.03
0.03
0.03
0.02
0.01
0.01
0.01
0.01
0.01
N/A
N/A
N/A
N/A
N/A
28
22
0
0
Complaints per 100 customer connections
N/A
N/A
N/A
N/A
N/A
0.00
0.00
0.00
0.00
Illness – confirmed
0
0
0
0
0.00
0.00
0
0
0
Complaints per 100 customer connections
0
0
0
0
0.00
0.00
0.00
0.00
0.00
Customers’ pipes
26
35
26
1
6
0
1
0
0
Complaints per 100 customer connections
0
0.01
0
0
0.00
0.00
0.00
0.00
0.00
Other
136
119
68
127
71
67
51
102
106
Complaints per 100 customer connections
0.02
0.02
0.01
0.02
0.01
0.01
0.01
0.01
0.01
Total
3396
3746
2549
3361
2338
2560
3023
2733
1945
Complaints per 100 customer connections
0.52
0.57
0.38
0.49
0.33
0.36
0.42
0.37
0.26
Illness –
1
.
alleged1
Alleged illness is reported separately and therefore not included in the total number of customer complaints.
Yarra Valley Water | Drinking Water Quality Report 2014/15
18
6
WATER QUALITY TEST RESULTS
2014/15
MONITORING
PROGRAM
Routine monitoring for all water
sampling localities (listed in Table
1 on page 10) was conducted
throughout 2014/15. A total of 22,141
samples were collected and analysed
to ensure the safety of drinking water
supplied to our customers. The total
number of samples was determined
using rigorous statistical analysis,
ensuring that the samples taken were
representative of the total volume of
drinking water supplied.
The frequency of our routine
monitoring met the monitoring
frequency set by the Department
of Health and Human Services. The
results of our routine monitoring are
reported to the Department of Health
and Human Services on a monthly
and annual basis and to the Essential
Services Commission (ESC) on a
quarterly and annual basis.
The samples were tested for
microbiological, health and aesthetic
parameters to ensure that the
drinking water delivered was safe
and pleasant to drink.
Water samples were collected and
analysed by an independent National
Association of Testing Authorities
(NATA) laboratory that employ
Department of Health and Human
Services accredited analysts.
to ensure that drinking water is free
from microbiological contamination
and hence safe to drink. The indicator
micro-organism used in our
microbiological testing is Escherichia
coli (E. coli).
This financial year, we took a total of
6,142 samples for microbiological
testing at designated customer
sampling taps, storage tanks and
reservoirs, and at designated points
along our pipe systems.
Microbiological sampling is
undertaken according to
recommended frequencies detailed
in the Australian Drinking Water
Guidelines 2011 and the Regulations.
All water sampling localities are
monitored at least twice-weekly (or
104 times per year) as part of Yarra
Valley Water’s monitoring program.
Aesthetic and Health Parameter
Monitoring
Aesthetic characteristics in drinking
water include appearance, taste and
odour, and corrosion potential. The
aesthetic characteristics measured
are turbidity, hardness, pH,
aluminium, iron, zinc and residual
chemicals including free and total
chlorine. Aluminium is only monitored
in sampling localities where
aluminium is used in the water
treatment process.
Microbiological Monitoring
Monitoring aesthetic parameters
ensures that drinking water is
pleasant to drink.
Microbiological testing is conducted
throughout our water supply system
The health parameters are related
to the residual chemicals in the water,
Yarra Valley Water | Drinking Water Quality Report 2014/15
including copper, fluoride, lead, and
chlorination by-products
[trihalomethanes (THMs) and
(chloroacetic acids (CAAs)].
Samples taken for aesthetic and
health parameters throughout
2014/15 were obtained from
designated customer taps and
storage tanks and reservoirs across
our drinking water supply system.
Variation in Sampling Frequency
An extensive analysis of disinfection
by-products (THMs,
monochloroacetic acid, dichloroacetic
acid, and trichloroacetic acid) was
conducted between 2002 and 2010.
The analysis concluded that over the
eight-year period, the disinfection byproducts listed above were present at
levels significantly below the standard
values in the Regulations. Yarra
Valley Water, with approval from the
Department of Health and Human
Services, reduced the sampling
frequency of these disinfection byproducts in the majority of water
sampling localities from monthly to
quarterly sampling.
This change was effective from 1 July
2011 to 30 June 2015. The formal
Victoria Government Gazette
announcing the change is attached
in Appendix 4 on page 51.
19
WATER QUALITY
COMPLIANCE
PARAMETERS –
RESULTS
‘(Maximum) 0.15 milligrams (of
(mono) chloroacetic acid) per litre of
drinking water for each sample
taken.’
Seven of the nine water quality
parameters set out in the Regulations
are:
1. E. coli
2. Monochloroacetic acid
3. Dichloroacetic acid
4. Trichloroacetic acid
5. Trihalomethanes
6. Aluminium
7. Turbidity.
All monochloroacetic acid samples
were below 0.15 mg/L. The complete
results for monochloroacetic acid
testing are summarised in Table 6,
Appendix 1 on page 34.
The results for these seven
compliance parameters are
presented in this section.
Ozone is not used by Yarra Valley
Water or Melbourne Water as a
treatment chemical, therefore
bromate and formaldehyde
(disinfection by-products from using
ozone) were not monitored at the
frequencies specified in Schedule 2
of the Safe Drinking Water
Regulations 2005.
E. coli
The Regulations specify that:
‘At least 98% of all samples of
drinking water collected in any 12month period contain no Escherichia
coli per 100 millilitres of drinking
water.’
Yarra Valley Water has met the
requirements set in the Regulations
for E. coli. The full results of testing
for E. coli are summarised in Table 5,
Appendix 1 on page 33.
Two microbiological samples
collected and analysed throughout
2014/15 contained E. coli.
Monochloroacetic Acid
The Regulations specify the standard
of:
Yarra Valley Water | Drinking Water Quality Report 2014/15
Dichloroacetic Acid
The Regulations specify the standard
of:
‘(Maximum) 0.1 milligrams (of
dichloroacetic acid) per litre of
drinking water for each sample
taken.’
All dichloroacetic acid samples were
below 0.1 mg/L. The complete results
for dichloroacetic acid testing are
summarised in Table 7, Appendix 1
on page 35.
Trichloroacetic Acid
The Regulations specify the standard
of:
‘(Maximum) 0.1 milligrams (of
trichloroacetic acid) per litre of
drinking water for each sample
taken.’
All trichloroacetic acid samples were
below 0.1 mg/L. The complete results
for trichloroacetic acid testing are
summarised in Table 8, Appendix 1
on page 36.
Trihalomethanes
The Regulations specify the standard
of:
‘(Maximum) 0.25 milligrams (of
THMs) per litre of drinking water for
each sample taken.’
All THM samples were below 0.25
mg/L. The complete results for THMs
testing is summarised in Table 9,
Appendix 1 on page 37.
Aluminium
The Regulations specify the standard
of:
‘(Maximum) 0.2 milligrams (of
aluminium) per litre of drinking water
for each sample taken.’
Of the localities where aluminium was
added to the water treatment
process, all except one non-routine
sample in Yarra Glen were below 0.2
mg/L. Yarra Glen water sampling
locality did not comply with the
Aluminium standard (refer to section
8.2 for details). The complete results
are outlined in Table 10, Appendix 1
on page 38.
Turbidity
The Regulations specify that:
‘95% upper confidence limit (UCL) of
the mean of samples of drinking
water collected in any 12-month
period must be less than or equal to
5.0 Nephelometric Turbidity Units
(NTU).’
All turbidity samples met this
standard.
Results are outlined in Table 11,
Appendix 1 on page 39.
WATER QUALITY
COMPLIANCE
PARAMETERS –
THREE-YEAR TREND
This section reports on the three-year
trend for the seven water quality
compliance parameters, as required
by the Regulations. This includes
trend analysis using annual
percentage compliance that relates
localities to their sources of water,
including treatment processes.
20
Microbiological (E. coli)
Over the last three years, only one
sample had an E. coli detection at
customer taps. This occurred in the
Eltham locality during 2014/15. The
three-year trend for E. coli for each
sampling locality is shown in Table
21, Appendix 3 on page 49.
AESTHETIC AND
HEALTH RELATED
WATER QUALITY
PARAMETERS –
RESULTS
Turbidity data for the past three years
is outlined in Table 22, Appendix 3 on
page 50.
Selected parameters from the
Australian Drinking Water Guidelines
2011 were sampled and tested to
ensure the safety of our drinking
water. These parameters include
copper, free and total chlorine
residuals, fluoride, lead, pH, iron,
zinc, and hardness.
All turbidity samples collected in
2014/15 were compliant. There are
no significant trends for turbidity over
the three-year period.
All parameters met Australian
Drinking Water Guidelines 2011
requirements with results outlined in
Appendix 2 on pages 40-48.
Other Water Quality Compliance
Parameters
Less than 1% of pH samples were
below the Guidelines’ minimum value
of 6.5 and 4% of pH samples were
above the Guidelines’ maximum
value of 8.5. These results were not
concentrated in any particular supply
area or time period, and none of the
pH levels recorded threatened the
health of our customers. The
complete results for pH samples for
2014/15 are outlined in Table 17,
Appendix 2 on page 41.
Turbidity
Levels of the remaining four water
quality parameters (monochloroacetic
acid, dichloroacetic acid,
trichloroacetic acid and THM’s) have
remained consistently below the
maximums defined in the Regulations
over the three-year period.
Yarra Valley Water | Drinking Water Quality Report 2014/15
21
7
REGULATED WATER
Regulated water is:
“…water that is not intended for
drinking but which could reasonably
be mistaken as being drinking water.”
(Department of Health and Human
Services, Regulated Water - Drinking
Water Regulation Guidance Note No.
1, July 2006). This water is declared
as ‘regulated’ as a means of
protecting public health.
Yarra Valley Water does not have
regulated water. However,
approximately 538 Yarra Valley
As part of its management plan,
Yarra Valley Water enters into an
agreement with all customers that
receive raw water. This agreement
provides the customer with important
information relating to the nature of
the supply and the customer’s rights
and responsibilities in relation to the
service. Customers are also
reminded about the important issues
regarding their service in quarterly
water bills.
Water customers receive
unchlorinated water from Melbourne
Water aqueducts and pipelines. This
water is termed ‘raw water’.
In accordance with the Safe Drinking
Water Act and in the interest of public
health, Yarra Valley Water is required
to take all reasonable steps to ensure
our customers are aware of the
conditions associated with the
unchlorinated water supply.
Yarra Valley Water | Drinking Water Quality Report 2014/15
22
8
EMERGENCY AND INCIDENT
MANAGEMENT
Yarra Valley Water has an
emergency management system to
respond to and recover from
emergencies.
These arrangements are supported
by our HACCP, ISO 9001 and ISO
14001 accreditation, and are a critical
part of ensuring the supply of safe
and pleasant drinking water.
The key principles of our emergency
management arrangements are
planning, preparation, prevention and
response.
Yarra Valley Water has aligned its
emergency management approach to
the Australasian Inter-service Incident
Management System (AIIMS).
AIIMS promotes effective multiagency operations through the use of
common terminology and a structure
that provides for appropriate
communication between
organisations at all levels of an
incident. This includes establishing a
cohesive chain of command within
the incident management structure.
These arrangements are consistent
with local and state emergency
services arrangements, as outlined
in the Emergency Management Act
1986 (Vic). To ensure consistency
with other state agencies, such as
the Metropolitan Fire Brigade and
Victoria Police, Yarra Valley Water is
part of the Victorian Water Security
and Continuity Network (state level),
and Water Sector – Infrastructure
Assurance Advisory Group (national
level).
Yarra Valley Water | Drinking Water Quality Report 2014/15
Yarra Valley Water continues to train
staff and improve emergency
response plans in collaboration with
stakeholders as part of the
emergency management system.
INCIDENTS AND
POTENTIAL WATER
QUALITY EVENTS
Section 18 of the Act:
‘A water supplier must notify the
Secretary in writing if it becomes
aware that the drinking water it is
supplying to another person does not
comply, or is not likely to comply, with
any relevant water quality standard
and must do so within 10 days after it
becomes aware of that fact.’
See Item 2 in Section 8.2 for
incidents reported in 2014/15.
EMERGENCIES AND
WATER QUALITY
EVENTS
Section 22 of the Act:
‘(1) This section applies if an officer
of a water supplier believes or
suspects, on reasonable grounds that
water supplied, or to be supplied, for
drinking purposes –
a. May be the cause of an illness; or
b. May be the means by which an
illness is being, has been or will be,
transmitted; or
c. May contain any pathogen,
substance, chemical or blue-green
algae toxin, whether alone or in
combination, at levels that may
pose a risk to human health; or
d. May cause widespread public
complaint.
‘(2) On forming that belief or
suspicion, the officer must
immediately report his or her belief or
suspicion to the Secretary, and must
make the report in the form required
by the Secretary.’
In 2014/15, four water quality events
were reported to the Department of
Health and Human Services pursuant
to section 22 of the Act.
1. On 4 August 2014, E.coli of 1
orgs/100mL was detected at a
customer tap in Eltham. The
affected sampling tap was
inspected and the water mains in
the immediate area were
flushed. Further sampling at five
other locations within the same
water quality zone were clear of
E.coli. E.coli was not detected in
the post flush sample collected
at the customer sampling tap. No
subsequent action was required.
2. On 25 August 2014 Melbourne
Water notified YVW of a soluble
aluminium result of 0.34mg/l at
the Yarra Glen service reservoir.
23
Three further samples taken by
YVW within the water sampling
locality returned values of 0.04,
0.22 (compliant due to rounding
rules) and 0.41 mg/l. The
Department of Health and Human
Services confirmed that there was
no risk to public health, however,
the sample result of 0.41mg/L
was above the drinking water
quality standard and therefore
was required to be reported under
Section 18 of the Safe Drinking
Water Act 2003. Melbourne
Water identified a fault at the
Yarra Glen Treatment Plant as
the cause of the high Aluminium
result which was promptly
rectified. Subsequent sample
results were compliant.
On 10 March 2015 Melbourne Water
notified YVW that a UV lamp had
broken at the Martyr Road Water
Treatment Plant in Warburton. A joint
investigation found that it was highly
likely that the configuration of the
network and the location of an
associated burst resulted in any
noncompliant water being flushed
from the system. As a precaution, the
mains in the affected area were
cleaned with a combination of
flushing, ice pigging and swabbing.
For this incident, the section 22
notification was submitted by
Melbourne Water.
3. On 27 October 2014, E.coli of 2
orgs/100mL was detected at
Chum Creek Tank. The tank was
immediately disinfected with
chlorine. Further sampling at 3
other locations within the same
water quality zone were clear of
E.coli. E.coli was not detected in
the post disinfection samples
collected at the reservoir.
4. On 16 May 2015 a contractor
undertook sampling prior to bringing
a new main into service in the
Epping area. As part of this testing,
they took a sample from the
existing Yarra Valley Water main,
and a sample from the new main. A
positive E.coli result was reported
from the sample taken from the
existing main. An investigation
confirmed the sample was not
collected in accordance with the
required sampling protocol and it is
likely that the sample was
contaminated. Yarra Valley Water
flushed the local water mains as a
precaution and all re- samples
taken on the following day were
clear of E.coli.
Yarra Valley Water | Drinking Water Quality Report 2014/15
24
9
RISK MANAGEMENT PLAN
AUDIT
Yarra Valley Water’s Drinking Water
Risk Management Plan has been
operational since 2005 and
incorporates the Hazard Analysis and
Critical Control Points (HACCP) Plan.
The Drinking Water Risk
Management Plan adopts the twelve
principles outlined in the Guidelines
and preventative risk management
strategies outlined in the Act.
In March 2014, Yarra Valley Water’s
Drinking Water Risk Management
Plan was audited by a Department of
Health and Human Services
approved auditor, and successfully
passed. A risk management plan
audit was not required during
2014/2015.
10
DRINKING WATER HACCP AUDIT
Yarra Valley Water maintains
certification of its Drinking
Water Hazard Analysis and
Critical Control Points
(HACCP) Plan. The triennial
recertification audit in
February 2015 confirmed that
Yarra Valley Water maintains
rigorous processes to manage
risks associated with drinking
water supply to ensure the
safety of our drinking water for
customers. No nonconformances or opportunities
for improvement were
identified in this audit.
Yarra Valley Water | Drinking Water Quality Report 2014/15
25
11
DRINKING WATER PROJECTS
Yarra Valley Water conducted a
number of projects during 2014/15 to
continually improve water quality and
the service we provide to our
customers.
NEW MAINS
CLEANING
TECHNOLOGY
In November 2011, Yarra Valley
Water began trialling an innovative
water mains cleaning technology
known as ‘ice pigging’.
Developed by UK company,
Aqualogy, ice pigging involves
pumping a thick ice slurry or ‘ice pig’
through the pipes to clean them.
Once inside the pipe, the ice behaves
like an abrasive solid matter, picking
up the sediments and transporting
them to a fire hydrant downstream
where they are extracted.
Trials of the technology found that ice
pigging was not only more effective
than flushing in terms of extracting
sediments, but it also used less water
and resulted in shorter disruptions to
customer supply. Due to the success
of the initial trial, Yarra Valley Water
entered into a contract with Aqualogy
for the provision of ice pigging
services for at least two years.
From November 2013 until June
2015, Yarra Valley Water completed
a large scale ice pigging trial in eight
water supply zones with a history of a
high water quality complaints and/or
high levels of coliforms. These zones
were Silvan E/T, Monbulk Reservoir,
Monbulk Pressure Boosted, Croydon
South Pressure Reduced, Heathmont
Yarra Valley Water | Drinking Water Quality Report 2014/15
Pressure Reduced, Donvale
Pressure Reduced, Andersons Creek
Pressure Reduced and part of
Preston Reservoir.
In order to measure effectiveness of
ice pigging, a number of performance
tests are carried out including
chlorine profiling and the use of a
continuous turbidity test called the
Resuspension Potential Method
(RPM). The RPM test measures the
capability of the sediment in a pipe to
resuspend as a result of an increase
in the velocity of the flow. These tests
are carried out before and after ice
pigging and then again at three, six
and twelve monthly intervals. Water
quality complaints and
microbiological samples are also
analysed for completeness.
The results from the zones cleaned in
2013-14 confirmed that ice pigging is
effective in reducing customer
complaints and enables zone
cleaning frequency to be extended to
three years, due to slower sediment
accumulation rates post initial
cleaning.
NETWORK MODEL
TO PREDICT WATER
QUALITY
In Ridge-Monbulk, we have
commenced a project aimed at
accurately modelling disinfection
residuals throughout the network.
Stage one of the project involves the
injection of a salt tracer into the water
supply system to assist in calibrating
a computerised hydraulic model of
the network for water age. A number
of temporary continuous water quality
monitoring stations will be installed
across the locality to collect data.
CHUM CREEK
RESERVOIR
UPGRADE
Chum Creek Reservoir is a one mega
litre (1ML) concrete tank with an
aluminium roof located north of
Healesville. This tank has had a
number of water quality incidents in
recent years which have been
attributed to degradation of the roof
structure and concrete walls.
A major refurbishment of the tank
was completed in 2015 to address
these issues. The work included
replacement of the roof, repair of the
concrete walls (both internally and
externally), application of a coating to
the internal tank wall, and lighting and
access improvements to rectify a
number of staff safety issues.
PARTICLE
DISPERSION
DEVICES
In 2000, Yarra Valley Water, in
partnership with Swinburne University
of Technology, developed a device to
prevent the settlement of sediments
in dead-end water mains (known as a
Particle Dispersion Device or PDD).
Since the installation of PDDs
commenced in 2005, Yarra Valley
Water has seen an 88% reduction in
water quality complaints in dead-end
water mains where a PDD has been
installed.
26
Yarra Valley Water | Drinking Water Quality Report 2014/15
27
YARRA
VALLEY
APPENDICES
WATER
Yarra Valley Water | Drinking Water Quality Report 2014/15
28
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: At least 98% of all samples of drinking water collected in any 12-month period to contain no E. coli per 100 mL
TABLE 5 - MICROBIOLOGICAL: ESCHERICHIA COLI (E. Coli)
2014–2015
Water Sampling Locality
No. of
Frequency of
Samples Sampling
No. of
Complying
Samples
No. of Non
Complying
Samples
Max Result
(orgs/100mL)
% Samples
with no E. coli
Complying
Brahams Road*
74
104
Twice weekly
104
0
0
100%
Yes
Bundoora*
14
348
Alternate days
348
0
0
100%
Yes
Croydon
51
363
Alternate days
363
0
0
100%
Yes
Doncaster*
50
267
Alternate days
267
0
0
100%
Yes
Eltham*
25
104
Twice weekly
103
1
0
99.0%
Yes
Emerald
46
105
Twice weekly
105
0
0
100%
Yes
Epping*
17
269
Alternate days
269
0
0
100%
Yes
Glen Waverley*
60
357
Alternate days
357
0
0
100%
Yes
Glenroy*
07
320
Alternate days
320
0
0
100%
Yes
Healesville*
22
104
Twice weekly
104
0
0
100%
Yes
Ivanhoe*
55
104
Twice weekly
104
0
0
100%
Yes
Kew*
53
378
Alternate days
378
0
0
100%
Yes
Lilydale
48
143
Alternate days
143
0
0
100%
Yes
Lower Plenty*
16
104
Twice weekly
104
0
0
100%
Yes
Lyrebird Avenue*
73
104
Twice weekly
104
0
0
100%
Yes
Malvern*
61
265
Alternate days
265
0
0
100%
Yes
Mernda/Hurstbridge
19
114
Alternate days
114
0
0
100%
Yes
Mitcham*
52
336
Alternate days
336
0
0
100%
Yes
Montrose*
56
105
Twice weekly
105
0
0
100%
Yes
Northcote*
10
335
Alternate days
335
0
0
100%
Yes
Plenty*
18
132
Twice weekly
132
0
0
100%
Yes
Preston
09
354
Alternate days
354
0
0
100%
Yes
Ridge/Monbulk*
47
105
Twice weekly
105
0
0
100%
Yes
Seville*
24
104
Twice weekly
104
0
0
100%
Yes
Somerton*
12
324
Alternate days
324
0
0
100%
Yes
Wallan*
71
105
Twice weekly
105
0
0
100%
Yes
Warburton*
21
104
Twice weekly
104
0
0
100%
Yes
Warranwood
49
168
Alternate days
168
0
0
100%
Yes
Whittlesea
20
105
Twice weekly
105
0
0
100%
Yes
Woori Yallock*
26
104
Twice weekly
104
0
0
100%
Yes
Yarra Glen*
23
104
Twice weekly
104
0
0
100%
Yes
Yarra Junction*
72
104
Twice weekly
104
0
0
100%
Yes
6,141
1
0
100%
TOTAL
6,142
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
29
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: Does not exceed 0.15 mg/L
TABLE 6 – CHLORINE-BASED DISINFECTION BY-PRODUCT CHEMICALS: CHLOROACETIC ACID
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
No. of Non
Complying
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0
0.002
0.002
Yes
Bundoora
14
Quarterly
4
0
0.002
0.002
Yes
Croydon
51
Quarterly
4
0
0.002
0.002
Yes
Doncaster
50
Quarterly
4
0
0.002
0.002
Yes
Eltham
25
Quarterly
4
0
0.001
0.001
Yes
Emerald
46
Quarterly
4
0
0.002
0.002
Yes
Epping
17
Quarterly
4
0
0.002
0.002
Yes
Glen Waverley
60
Quarterly
4
0
0.002
0.002
Yes
Glenroy
07
Quarterly
4
0
0.002
0.002
Yes
Healesville
22
Quarterly
4
0
0.002
0.002
Yes
Ivanhoe
55
Quarterly
4
0
0.002
0.002
Yes
Kew
53
Quarterly
4
0
0.002
0.002
Yes
Lilydale
48
Quarterly
4
0
0.002
0.002
Yes
Lower Plenty
16
Quarterly
4
0
0.002
0.002
Yes
Lyrebird Avenue
73
Quarterly
4
0
0.002
0.002
Yes
Malvern
61
Quarterly
4
0
0.002
0.002
Yes
Mernda/Hurstbridge
19
Quarterly
4
0
0.002
0.002
Yes
Mitcham
52
Quarterly
4
0
0.002
0.002
Yes
Montrose
56
Quarterly
4
0
0.002
0.002
Yes
Northcote
10
Quarterly
4
0
0.002
0.002
Yes
Plenty
18
Quarterly
4
0
0.002
0.001
Yes
Preston
09
Quarterly
4
0
0.002
0.002
Yes
Ridge/Monbulk
47
Quarterly
4
0
0.002
0.002
Yes
Seville
24
Quarterly
4
0
0.002
0.002
Yes
Somerton
12
Quarterly
4
0
0.002
0.002
Yes
Wallan
71
Quarterly
4
0
0.002
0.002
Yes
Warburton
21
Quarterly
4
0
0.002
0.002
Yes
Warranwood
49
Quarterly
4
0
0.002
0.002
Yes
Whittlesea
20
Quarterly
4
0
0.002
0.002
Yes
Woori Yallock
26
Quarterly
4
0
0.002
0.002
Yes
Yarra Glen
23
Quarterly
4
0
0.002
0.002
Yes
Yarra Junction
72
Quarterly
4
0
0.002
0.002
Yes
128
0
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
30
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: Does not exceed 0.1 mg/L
TABLE 7 – CHLORINE-BASED DISINFECTION BY-PRODUCT CHEMICALS: DICHLOROACETIC ACID
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
No. of Non
Complying
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0
0.002
0.002
Yes
Bundoora
14
Quarterly
4
0
0.002
0.002
Yes
Croydon
51
Quarterly
4
0
0.014
0.005
Yes
Doncaster
50
Quarterly
4
0
0.014
0.002
Yes
Eltham
25
Quarterly
4
0
0.002
0.001
Yes
Emerald
46
Quarterly
4
0
0.008
0.002
Yes
Epping
17
Quarterly
4
0
0.002
0.002
Yes
Glen Waverley
60
Quarterly
4
0
0.014
0.008
Yes
Glenroy
07
Quarterly
4
0
0.006
0.002
Yes
Healesville
22
Quarterly
4
0
0.002
0.002
Yes
Ivanhoe
55
Quarterly
4
0
0.007
0.002
Yes
Kew
53
Quarterly
4
0
0.009
0.002
Yes
Lilydale
48
Quarterly
4
0
0.008
0.002
Yes
Lower Plenty
16
Quarterly
4
0
0.009
0.007
Yes
Lyrebird Avenue
73
Quarterly
4
0
0.002
0.002
Yes
Malvern
61
Quarterly
4
0
0.007
0.002
Yes
Mernda/Hurstbridge
19
Quarterly
4
0
0.002
0.002
Yes
Mitcham
52
Quarterly
4
0
0.009
0.002
Yes
Montrose
56
Quarterly
4
0
0.012
0.007
Yes
Northcote
10
Quarterly
4
0
0.011
0.002
Yes
Plenty
18
Quarterly
4
0
0.002
0.001
Yes
Preston
09
Quarterly
4
0
0.002
0.002
Yes
Ridge/Monbulk
47
Quarterly
4
0
0.039
0.002
Yes
Seville
24
Quarterly
4
0
0.002
0.002
Yes
Somerton
12
Quarterly
4
0
0.011
0.002
Yes
Wallan
71
Quarterly
4
0
0.007
0.002
Yes
Warburton
21
Quarterly
4
0
0.012
0.002
Yes
Warranwood
49
Quarterly
4
0
0.013
0.002
Yes
Whittlesea
20
Quarterly
4
0
0.002
0.002
Yes
Woori Yallock
26
Quarterly
4
0
0.024
0.002
Yes
Yarra Glen
23
Quarterly
4
0
0.009
0.002
Yes
Yarra Junction
72
Quarterly
4
0
0.009
0.002
Yes
128
0
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
31
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: Does not exceed 0.1 mg/L
TABLE 8 – CHLORINE-BASED DISINFECTION BY-PRODUCT CHEMICALS: TRICHLOROACETIC ACID
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
No. of Non
Complying
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0
0.002
0.002
Yes
Bundoora
14
Quarterly
4
0
0.006
0.002
Yes
Croydon
51
Quarterly
4
0
0.034
0.020
Yes
Doncaster
50
Quarterly
4
0
0.032
0.022
Yes
Eltham
25
Quarterly
4
0
0.005
0.003
Yes
Emerald
46
Quarterly
4
0
0.002
0.002
Yes
Epping
17
Quarterly
4
0
0.006
0.002
Yes
Glen Waverley
60
Quarterly
4
0
0.043
0.026
Yes
Glenroy
07
Quarterly
4
0
0.008
0.002
Yes
Healesville
22
Quarterly
4
0
0.014
0.006
Yes
Ivanhoe
55
Quarterly
4
0
0.028
0.010
Yes
Kew
53
Quarterly
4
0
0.045
0.013
Yes
Lilydale
48
Quarterly
4
0
0.034
0.016
Yes
Lower Plenty
16
Quarterly
4
0
0.033
0.024
Yes
Lyrebird Avenue
73
Quarterly
4
0
0.002
0.002
Yes
Malvern
61
Quarterly
4
0
0.026
0.016
Yes
Mernda/Hurstbridge
19
Quarterly
4
0
0.009
0.002
Yes
Mitcham
52
Quarterly
4
0
0.040
0.018
Yes
Montrose
56
Quarterly
4
0
0.035
0.023
Yes
Northcote
10
Quarterly
4
0
0.034
0.011
Yes
Plenty
18
Quarterly
4
0
0.004
0.002
Yes
Preston
09
Quarterly
4
0
0.018
0.002
Yes
Ridge/Monbulk
47
Quarterly
4
0
0.060
0.013
Yes
Seville
24
Quarterly
4
0
0.035
0.010
Yes
Somerton
12
Quarterly
4
0
0.050
0.008
Yes
Wallan
71
Quarterly
4
0
0.044
0.020
Yes
Warburton
21
Quarterly
4
0
0.019
0.011
Yes
Warranwood
49
Quarterly
4
0
0.038
0.002
Yes
Whittlesea
20
Quarterly
4
0
0.006
0.002
Yes
Woori Yallock
26
Quarterly
4
0
0.025
0.013
Yes
Yarra Glen
23
Quarterly
4
0
0.019
0.012
Yes
Yarra Junction
72
Quarterly
4
0
0.012
0.002
Yes
128
0
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
32
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: Does not exceed 0.25 mg/L
TABLE 9 – CHLORINE-BASED DISINFECTION BY-PRODUCT CHEMICALS: TRIHALOMETHANES (THMS)
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
No. of Non
Complying
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0
0.026
0.011
Yes
Bundoora
14
Quarterly
4
0
0.040
0.030
Yes
Croydon
51
Quarterly
4
0
0.084
0.051
Yes
Doncaster
50
Quarterly
4
0
0.085
0.066
Yes
Eltham
25
Quarterly
4
0
0.037
0.033
Yes
Emerald
46
Quarterly
4
0
0.003
0.002
Yes
Epping
17
Quarterly
4
0
0.039
0.027
Yes
Glen Waverley
60
Quarterly
4
0
0.090
0.065
Yes
Glenroy
07
Quarterly
4
0
0.030
0.014
Yes
Healesville
22
Quarterly
4
0
0.035
0.015
Yes
Ivanhoe
55
Quarterly
4
0
0.100
0.072
Yes
Kew
53
Quarterly
4
0
0.110
0.069
Yes
Lilydale
48
Quarterly
4
0
0.110
0.081
Yes
Lower Plenty
16
Quarterly
4
0
0.090
0.072
Yes
Lyrebird Avenue
73
Quarterly
4
0
0.019
0.017
Yes
Malvern
61
Quarterly
4
0
0.100
0.062
Yes
Mernda/Hurstbridge
19
Quarterly
4
0
0.052
0.028
Yes
Mitcham
52
Quarterly
4
0
0.096
0.071
Yes
Montrose
56
Quarterly
4
0
0.094
0.062
Yes
Northcote
10
Quarterly
4
0
0.092
0.050
Yes
Plenty
18
Quarterly
4
0
0.041
0.027
Yes
Preston
09
Quarterly
4
0
0.083
0.039
Yes
Ridge/Monbulk
47
Quarterly
4
0
0.093
0.074
Yes
Seville
24
Quarterly
4
0
0.110
0.075
Yes
Somerton
12
Quarterly
4
0
0.110
0.032
Yes
Wallan
71
Quarterly
4
0
0.080
0.059
Yes
Warburton
21
Quarterly
4
0
0.061
0.044
Yes
Warranwood
49
Quarterly
4
0
0.097
0.067
Yes
Whittlesea
20
Quarterly
4
0
0.056
0.047
Yes
Woori Yallock
26
Quarterly
4
0
0.073
0.040
Yes
Yarra Glen
23
Quarterly
4
0
0.062
0.040
Yes
Yarra Junction
72
Quarterly
4
0
0.045
0.021
Yes
128
0
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
33
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: Does not exceed 0.2 mg/L
TABLE 10 – PHYSICAL/CHEMICAL: ALUMINIUM
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
No. of Non
Complying
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Complying
(Yes/No)
Bundoora
14
Monthly
12
0
0.03
0.01
Yes
Eltham
25
Monthly
12
0
0.03
0.02
Yes
Epping
17
Monthly
12
0
0.04
0.02
Yes
Healesville
22
Monthly
12
0
0.03
0.01
Yes
Ivanhoe
55
Monthly
12
0
0.05
0.01
Yes
Kew
53
Monthly
12
0
0.05
0.01
Yes
Mernda/Hurstbridge
19
Monthly
12
0
0.03
0.01
Yes
Northcote
10
Monthly
12
0
0.04
0.02
Yes
Plenty
18
Monthly
12
0
0.03
0.01
Yes
Preston
09
Monthly
12
0
0.05
0.01
Yes
Whittlesea
20
Monthly
12
0
0.07
0.03
Yes
Yarra Glen
23
Monthly
12
0
0.22
0.01
Yes1
144
0
-
-
TOTAL
Monitoring aluminium is undertaken only in zones where aluminium is added to the water treatment process. Other localities comply with the standard.
Note 1 – one aluminium result from a sample collected outside the routine monitoring program(not included in the routine test results in Table 10) exceeded the
water quality standard. . The exceedance was investigated and corrective actions were implemented as described in Section 8.2
Yarra Valley Water | Drinking Water Quality Report 2014/15
34
APPENDIX
1
RESULTS OF PARAMETERS SPECIFIED IN REGULATIONS
Standard: 95% Upper Confidence Limit (UCL) of mean less than or equal to 5 Nephelometric Turbidity Units (NTU)
TABLE 11 – PHYSICAL/CHEMICAL: TURBIDITY
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(NTU)
Minimum
(NTU)
95% UCL of
Mean (NTU)
Complying
(Yes/No)
Brahams Road*
74
Weekly
52
1.9
0.6
1.5
Yes
Bundoora*
14
Weekly
52
2.0
0.1
0.4
Yes
Croydon*
51
Weekly
52
1.2
0.5
0.9
Yes
Doncaster*
50
Weekly
53
1.3
0.5
0.9
Yes
Eltham*
25
Weekly
52
1.8
0.1
0.3
Yes
Emerald
46
Weekly
53
1.4
0.6
1.1
Yes
Epping*
17
Weekly
52
1.3
0.1
0.4
Yes
Glen Waverley*
60
Weekly
52
1.2
0.5
1.0
Yes
Glenroy*
07
Weekly
52
2.5
0.8
1.2
Yes
Healesville*
22
Weekly
52
0.4
0.0
0.2
Yes
Ivanhoe*
55
Weekly
52
4.1
0.4
1.0
Yes
Kew*
53
Weekly
52
1.9
0.6
1.0
Yes
Lilydale*
48
Weekly
52
1.4
0.6
1.0
Yes
Lower Plenty*
16
Weekly
52
1.3
0.6
0.9
Yes
Lyrebird Avenue*
73
Weekly
52
2.1
0.6
2.5
Yes
Malvern*
61
Weekly
53
1.3
0.5
0.9
Yes
Mernda/Hurstbridge*
19
Weekly
52
0.3
0.1
0.3
Yes
Mitcham*
52
Weekly
52
1.6
0.5
0.9
Yes
Montrose*
56
Weekly
53
1.2
0.6
0.9
Yes
Northcote*
10
Weekly
52
1.2
0.4
0.8
Yes
Plenty*
18
Weekly
52
0.3
0.1
0.20
Yes
Preston*
09
Weekly
52
2.2
0.5
0.9
Yes
Ridge/Monbulk*
47
Weekly
53
1.9
0.6
1.2
Yes
Seville*
24
Weekly
52
1.2
0.4
0.9
Yes
Somerton*
12
Weekly
52
1.8
0.5
1.0
Yes
Wallan*
71
Weekly
53
1.5
0.7
1.2
Yes
Warburton*
21
Weekly
52
3.2
0.6
1.6
Yes
Warranwood*
49
Weekly
52
1.2
0.5
1.0
Yes
Whittlesea
20
Weekly
53
1.0
0.2
0.4
Yes
Woori Yallock*
26
Weekly
52
4.3
0.6
1.8
Yes
Yarra Glen*
23
Weekly
52
0.5
0.1
0.2
Yes
Yarra Junction*
72
Weekly
52
2.9
0.6
1.7
Yes
-
-
TOTAL
1,671
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
35
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Does not exceed 2 mg/L
TABLE 12 – PHYSICAL/CHEMICAL: OTHER CHEMICALS – COPPER
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
No. of Non
Complying
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0
0.058
0.012
Yes
Bundoora*
14
Quarterly
4
0
0.019
0.004
Yes
Croydon
51
Quarterly
4
0
0.009
0.003
Yes
Doncaster*
50
Quarterly
4
0
0.008
0.004
Yes
Eltham
25
Quarterly
4
0
0.035
0.001
Yes
Emerald
46
Quarterly
4
0
0.013
0.006
Yes
Epping*
17
Quarterly
4
0
0.009
0.001
Yes
Glen Waverley
60
Quarterly
4
0
0.025
0.004
Yes
Glenroy*
07
Quarterly
4
0
0.060
0.003
Yes
Healesville*
22
Quarterly
4
0
0.003
0.001
Yes
Ivanhoe*
55
Quarterly
4
0
0.029
0.004
Yes
Kew*
53
Quarterly
4
0
0.010
0.004
Yes
Lilydale
48
Quarterly
4
0
0.005
0.001
Yes
Lower Plenty*
16
Quarterly
4
0
0.045
0.002
Yes
Lyrebird Avenue
73
Quarterly
4
0
0.011
0.001
Yes
Malvern*
61
Quarterly
4
0
0.013
0.005
Yes
Mernda/Hurstbridge
19
Quarterly
4
0
0.003
0.001
Yes
Mitcham*
52
Quarterly
4
0
0.020
0.006
Yes
Montrose*
56
Quarterly
4
0
0.013
0.003
Yes
Northcote*
10
Quarterly
4
0
0.028
0.005
Yes
Plenty*
18
Quarterly
4
0
0.002
0.001
Yes
Preston
09
Quarterly
4
0
0.019
0.005
Yes
Ridge/Monbulk*
47
Quarterly
4
0
0.006
0.002
Yes
Seville
24
Quarterly
4
0
0.006
0.001
Yes
Somerton*
12
Quarterly
4
0
0.018
0.002
Yes
Wallan*
71
Quarterly
4
0
0.013
0.002
Yes
Warburton*
21
Quarterly
4
0
0.047
0.001
Yes
Warranwood
49
Quarterly
4
0
0.066
0.001
Yes
Whittlesea
20
Quarterly
4
0
0.007
0.003
Yes
Woori Yallock*
26
Quarterly
4
0
0.027
0.002
Yes
Yarra Glen*
23
Quarterly
4
0
0.028
0.007
Yes
Yarra Junction
72
Quarterly
4
0
0.014
0.001
Yes
0
-
-
TOTAL
128
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
36
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Mean value less than or equal to 5 mg/L
TABLE 13 – PHYSICAL/CHEMICAL: CHLORINE-BASED CHEMICALS – FREE CHLORINE RESIDUAL
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Twice weekly
105
0.28
0.01
0.03
Yes
Bundoora
14
Alternate days
348
0.82
0.01
0.15
Yes
Croydon
51
Alternate days
364
1.15
0.01
0.25
Yes
Doncaster
50
Alternate days
267
0.84
0.01
0.11
Yes
Eltham
25
Twice weekly
104
0.39
0.01
0.12
Yes
Epping*
17
Alternate days
269
0.78
0.01
0.15
Yes
Glen Waverley
60
Alternate days
357
0.58
0.01
0.15
Yes
Glenroy
07
Alternate days
320
0.78
0.03
0.30
Yes
Healesville*
22
Twice weekly
104
0.57
0.01
0.18
Yes
Ivanhoe
55
Twice weekly
104
0.45
0.01
0.05
Yes
Kew
53
Alternate days
378
0.46
0.01
0.06
Yes
Lilydale
48
Alternate days
143
0.72
0.01
0.13
Yes
Lower Plenty
16
Twice weekly
104
0.43
0.01
0.10
Yes
Lyrebird Avenue
73
Twice weekly
104
0.10
0.01
0.03
Yes
Malvern
61
Alternate days
265
0.36
0.01
0.08
Yes
Mernda/Hurstbridge
19
Twice weekly
114
0.78
0.01
0.19
Yes
Mitcham
52
Alternate days
336
0.32
0.01
0.09
Yes
Montrose
56
Twice weekly
105
0.58
0.01
0.19
Yes
Northcote
10
Alternate days
335
0.61
0.01
0.17
Yes
Plenty
18
Twice weekly
132
0.53
0.01
0.15
Yes
Preston
09
Alternate days
354
0.47
0.01
0.07
Yes
Ridge/Monbulk1*
47
Twice weekly
105
0.73
0.01
0.21
Yes
Seville
24
Twice weekly
104
0.47
0.01
0.12
Yes
Somerton
12
Alternate days
324
0.74
0.01
0.14
Yes
Wallan
71
Twice weekly
105
0.83
0.03
0.34
Yes
Warburton*
21
Twice weekly
104
0.45
0.01
0.12
Yes
Warranwood
49
Twice weekly
168
0.91
0.01
0.10
Yes
Whittlesea
20
Twice weekly
105
0.47
0.09
0.27
Yes
Woori Yallock*
26
Twice weekly
104
0.81
0.01
0.29
Yes
Yarra Glen*
23
Twice weekly
104
1.14
0.03
0.25
Yes
Yarra Junction
72
Twice weekly
104
0.61
0.01
0.17
Yes
-
-
TOTAL
1Ridge/Monbulk
6,039
Water Quality Zone was changed from chloramination to chlorination on 10 Dec 2013. From this date onward the zone was tested twice weekly.
No free chlorine monitoring is undertaken in Emerald as the zone is chloraminated.
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
37
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Mean value less than or equal to 5 mg/L
TABLE 14 – PHYSICAL/CHEMICAL: CHLORINE-BASED CHEMICALS – TOTAL CHLORINE RESIDUAL
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Twice weekly
105
0.39
0.01
0.04
Yes
Bundoora
14
Alternate days
348
0.92
0.02
0.25
Yes
Croydon
51
Alternate days
364
1.30
0.05
0.36
Yes
Doncaster
50
Alternate days
267
0.95
0.03
0.19
Yes
Eltham
25
Twice weekly
104
0.50
0.05
0.21
Yes
Emerald
46
Twice weekly
105
1.67
0.03
0.57
Yes
Epping*
17
Alternate days
269
0.84
0.01
0.24
Yes
Glen Waverley
60
Alternate days
357
0.74
0.01
0.25
Yes
Glenroy
07
Alternate days
320
0.89
0.05
0.43
Yes
Healesville*
22
Twice weekly
104
0.64
0.03
0.25
Yes
Ivanhoe
55
Twice weekly
104
0.59
0.03
0.13
Yes
Kew
53
Alternate days
378
0.60
0.01
0.14
Yes
Lilydale
48
Alternate days
143
0.88
0.03
0.22
Yes
Lower Plenty
16
Twice weekly
104
0.56
0.03
0.20
Yes
Lyrebird Avenue
73
Twice weekly
104
0.19
0.01
0.05
Yes
Malvern
61
Alternate days
265
0.44
0.03
0.17
Yes
Mernda/Hurstbridge
19
Twice weekly
114
0.94
0.03
0.29
Yes
Mitcham
52
Alternate days
336
0.43
0.03
0.18
Yes
Montrose
56
Twice weekly
105
0.71
0.03
0.29
Yes
Northcote
10
Alternate days
335
0.71
0.03
0.27
Yes
Plenty
18
Twice weekly
132
0.66
0.03
0.24
Yes
Preston
09
Alternate days
354
0.60
0.03
0.16
Yes
Ridge/Monbulk
47
Twice weekly
105
1.35
0.03
0.33
Yes
Seville
24
Twice weekly
104
0.64
0.03
0.20
Yes
Somerton
12
Alternate days
324
0.93
0.03
0.23
Yes
Wallan
71
Twice weekly
105
0.92
0.09
0.47
Yes
Warburton*
21
Twice weekly
104
0.52
0.03
0.20
Yes
Warranwood
49
Alternate days
168
0.98
0.03
0.18
Yes
Whittlesea
20
Twice weekly
105
0.55
0.17
0.36
Yes
Woori Yallock*
26
Twice weekly
104
0.90
0.03
0.39
Yes
Yarra Glen*
23
Twice weekly
104
1.35
0.06
0.34
Yes
Yarra Junction
72
Twice weekly
104
0.71
0.03
0.25
Yes
-
-
TOTAL
6,144
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
38
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: For fluoridated supplies, maximum is less than or equal to 1.5 mg/L and the annual average does not exceed 1.0 mg/L
TABLE 15 – PHYSICAL/CHEMICAL: CHLORINE-BASED CHEMICALS – FLUORIDE
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Bundoora
14
Twice weekly
104
0.96
0.69
0.88
Yes
Croydon
51
Twice weekly
104
1.00
0.65
0.89
Yes
Doncaster
50
Monthly
12
0.95
0.62
0.87
Yes
Eltham
25
Twice weekly
105
0.97
0.42
0.87
Yes
Epping
17
Twice weekly
104
0.98
0.65
0.88
Yes
Glen Waverley
60
Monthly
13
0.94
0.82
0.89
Yes
Glenroy
07
Monthly
12
0.96
0.90
0.93
Yes
Ivanhoe
55
Twice weekly
105
0.97
0.57
0.89
Yes
Kew
53
Twice weekly
104
0.97
0.60
0.88
Yes
Lilydale
48
Weekly
52
0.98
0.73
0.90
Yes
Lower Plenty
16
Monthly
13
0.96
0.53
0.88
Yes
Malvern
61
Monthly
12
0.94
0.84
0.88
Yes
Mernda/Hurstbridge
19
Twice weekly
103
0.97
0.68
0.87
Yes
Mitcham
52
Twice weekly
104
1.00
0.42
0.88
Yes
Montrose
56
Twice weekly
105
0.97
0.61
0.87
Yes
Northcote
10
Monthly
12
0.95
0.85
0.89
Yes
Plenty
18
Monthly
12
0.91
0.75
0.87
Yes
Preston
09
Monthly
12
0.94
0.85
0.89
Yes
Ridge/Monbulk
47
Twice weekly
104
0.96
0.05
0.83
Yes
Seville
24
Monthly
12
0.94
0.83
0.88
Yes
Somerton
12
Monthly
12
0.96
0.89
0.92
Yes
Wallan
71
Monthly
11
0.96
0.90
0.92
Yes
Warranwood
49
Weekly
53
1.20
0.59
0.89
Yes
Whittlesea
20
Twice weekly
105
1.00
0.80
0.88
Yes
-
-
TOTAL
1,385
Monitoring of fluoride was not undertaken in sampling localities where no fluoride was added to the water treatment process: Yarra Glen, Healesville, Emerald,
Warburton, Yarra Junction, Woori Yallock, Brahams Road and Lyrebird Avenue.
Yarra Valley Water | Drinking Water Quality Report 2014/15
39
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Does not exceed 0.01 mg/L
TABLE 16 – PHYSICAL/CHEMICAL: OTHER CHEMICALS – LEAD
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0.002
0.001
0.001
Yes
Bundoora
14
Quarterly
4
0.001
0.001
0.001
Yes
Croydon
51
Quarterly
4
0.001
0.001
0.001
Yes
Doncaster
50
Quarterly
4
0.001
0.001
0.001
Yes
Eltham
25
Quarterly
4
0.001
0.001
0.001
Yes
Emerald
46
Quarterly
4
0.001
0.001
0.001
Yes
Epping
17
Quarterly
4
0.001
0.001
0.001
Yes
Glen Waverley
60
Quarterly
4
0.001
0.001
0.001
Yes
Glenroy
07
Quarterly
4
0.001
0.001
0.001
Yes
Healesville
22
Quarterly
4
0.001
0.001
0.001
Yes
Ivanhoe
55
Quarterly
4
0.001
0.001
0.001
Yes
Kew
53
Quarterly
4
0.001
0.001
0.001
Yes
Lilydale
48
Quarterly
4
0.001
0.001
0.001
Yes
Lower Plenty
16
Quarterly
4
0.001
0.001
0.001
Yes
Lyrebird Avenue
73
Quarterly
4
0.001
0.001
0.001
Yes
Malvern
61
Quarterly
4
0.001
0.001
0.001
Yes
Mernda/Hurstbridge
19
Quarterly
4
0.001
0.001
0.001
Yes
Mitcham
52
Quarterly
4
0.001
0.001
0.001
Yes
Montrose
56
Quarterly
4
0.001
0.001
0.001
Yes
Northcote
10
Quarterly
4
0.001
0.001
0.001
Yes
Plenty
18
Quarterly
4
0.001
0.001
0.001
Yes
Preston
09
Quarterly
4
0.001
0.001
0.001
Yes
Ridge/Monbulk
47
Quarterly
4
0.001
0.001
0.001
Yes
Seville
24
Quarterly
4
0.001
0.001
0.001
Yes
Somerton
12
Quarterly
4
0.001
0.001
0.001
Yes
Wallan
71
Quarterly
4
0.001
0.001
0.001
Yes
Warburton
21
Quarterly
4
0.001
0.001
0.001
Yes
Warranwood
49
Quarterly
4
0.001
0.001
0.001
Yes
Whittlesea
20
Quarterly
4
0.001
0.001
0.001
Yes
Woori Yallock
26
Quarterly
4
0.001
0.001
0.001
Yes
Yarra Glen
23
Quarterly
4
0.001
0.001
0.001
Yes
Yarra Junction
72
Quarterly
4
0.001
0.001
0.001
Yes
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
128
40
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Mean less than or equal to 8.5 units
Mean value greater than or equal to 6.5 units
TABLE 17 – PHYSICAL/CHEMICAL: AESTHETICS – pH
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum (mg/L)
Minimum
(mg/L)
Mean (mg/L)
Complying
(Yes/No)
Brahams Road
74
Twice weekly
105
8.2
6.4
7.1
Yes
Bundoora
14
Alternate days
348
9.6
6.5
7.4
Yes1
Croydon
51
Alternate days
364
9.3
6.3
7.6
Yes1
Doncaster
50
Alternate days
267
10.4
6.8
7.8
Yes1
Eltham
25
Twice weekly
104
9.5
6.5
7.8
Yes1
Emerald
46
Twice weekly
105
10.2
6.5
7.7
Yes1
Epping*
17
Alternate days
269
9.5
6.6
7.4
Yes1
Glen Waverley
60
Alternate days
357
9.3
6.7
7.6
Yes1
Glenroy
07
Alternate days
320
8.4
6.7
7.3
Yes
Healesville*
22
Twice weekly
104
9.5
7.0
8.1
Yes1
Ivanhoe
55
Twice weekly
104
8.2
6.9
7.5
Yes
Kew
53
Alternate days
378
8.7
6.8
7.5
Yes
Lilydale
48
Alternate days
143
9.0
6.7
7.7
Yes
Lower Plenty
16
Twice weekly
104
8.5
6.4
7.5
Yes
Lyrebird Avenue
73
Twice weekly
104
9.1
6.4
7.4
Yes
Malvern
61
Alternate days
265
8.3
6.7
7.4
Yes
Mernda/Hurstbridge
19
Twice weekly
114
9.4
6.8
7.6
Yes1
Mitcham
52
Alternate days
336
9.3
6.9
7.6
Yes1
Montrose*
56
Twice weekly
105
8.7
6.7
7.6
Yes
Northcote
10
Alternate days
335
8.9
6.8
7.4
Yes
Plenty
18
Twice weekly
132
9.3
6.9
7.6
Yes1
Preston
09
Alternate days
354
9.1
6.7
7.5
Yes
Ridge/Monbulk
47
Twice weekly
105
9.6
6.7
8.0
Yes1
Seville
24
Twice weekly
104
9.3
6.7
7.6
Yes1
Somerton
12
Alternate days
324
9.4
6.6
7.5
Yes1
Wallan
71
Twice weekly
105
8.5
6.6
7.4
Yes
Warburton*
21
Twice weekly
104
9.0
6.4
7.4
Yes
Warranwood
49
Alternate days
168
9.2
6.7
7.9
Yes1
Whittlesea
20
Twice weekly
105
8.8
7.1
8.0
Yes
Woori Yallock*
26
Twice weekly
104
9.3
6.5
7.5
Yes1
Yarra Glen*
23
Twice weekly
104
8.9
6.9
7.6
Yes
Yarra Junction
72
Twice weekly
104
9.3
6.6
7.4
Yes1
-
-
TOTAL
6,144
1 Compliance
based on mean result for the 12 month period. Single sample results can therefore go above the limit while the locality still complies.
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
41
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Does not exceed 0.3 mg/L
TABLE 18 – PHYSICAL/CHEMICAL: AESTHETICS – IRON
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Monthly
4
0.10
0.05
0.07
Yes
Bundoora
14
Monthly
4
0.01
0.01
0.01
Yes
Croydon
51
Monthly
4
0.08
0.05
0.07
Yes
Doncaster*
50
Monthly
4
0.07
0.04
0.06
Yes
Eltham
25
Monthly
4
0.02
0.01
0.01
Yes
Emerald
46
Monthly
4
0.06
0.04
0.05
Yes
Epping*
17
Monthly
4
0.02
0.01
0.01
Yes
Glen Waverley
60
Monthly
4
0.08
0.05
0.06
Yes
Glenroy*
07
Monthly
12
0.11
0.04
0.08
Yes
Healesville*
22
Monthly
4
0.03
0.01
0.01
Yes
Ivanhoe*
55
Monthly
4
0.07
0.05
0.06
Yes
Kew*
53
Monthly
4
0.08
0.06
0.07
Yes
Lilydale
48
Monthly
4
0.08
0.05
0.06
Yes
Lower Plenty*
16
Monthly
4
0.08
0.05
0.07
Yes
Lyrebird Avenue
73
Monthly
4
0.10
0.05
0.08
Yes
Malvern*
61
Monthly
4
0.08
0.04
0.06
Yes
Mernda/Hurstbridge
19
Monthly
4
0.01
0.01
0.01
Yes
Mitcham*
52
Monthly
4
0.09
0.06
0.07
Yes
Montrose*
56
Monthly
4
0.08
0.04
0.06
Yes
Northcote*
10
Monthly
4
0.07
0.03
0.05
Yes
Plenty*
18
Monthly
4
0.01
0.01
0.01
Yes
Preston*
09
Monthly
4
0.08
0.01
0.05
Yes
Ridge/Monbulk*
47
Monthly
4
0.09
0.06
0.08
Yes
Seville
24
Monthly
4
0.08
0.06
0.07
Yes
Somerton*
12
Monthly
4
0.09
0.06
0.07
Yes
Wallan*
71
Monthly
4
0.10
0.07
0.09
Yes
Warburton*
21
Monthly
4
0.10
0.06
0.09
Yes
Warranwood*
49
Monthly
12
0.09
0.05
0.07
Yes
Whittlesea
20
Monthly
4
0.03
0.01
0.01
Yes
Woori Yallock*
26
Monthly
4
0.10
0.05
0.08
Yes
Yarra Glen*
23
Monthly
4
0.01
0.01
0.01
Yes
Yarra Junction*
72
Monthly
5
0.09
0.05
0.07
Yes
-
-
TOTAL
145
* On some occasions, the independent laboratory has taken more samples than the minimum specified in Yarra Valley Water’s monitoring program.
Yarra Valley Water | Drinking Water Quality Report 2014/15
42
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Should be less than 3 mg/L
TABLE 19 – PHYSICAL/CHEMICAL: AESTHETICS – ZINC
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
0.020
0.004
0.010
Yes
Bundoora
14
Quarterly
4
0.002
0.001
0.002
Yes
Croydon
51
Quarterly
4
0.003
0.001
0.001
Yes
Doncaster
50
Quarterly
4
0.003
0.002
0.002
Yes
Eltham
25
Quarterly
4
0.003
0.001
0.002
Yes
Emerald
46
Quarterly
4
0.003
0.001
0.002
Yes
Epping
17
Quarterly
4
0.020
0.001
0.007
Yes
Glen Waverley
60
Quarterly
4
0.006
0.003
0.005
Yes
Glenroy
07
Quarterly
4
0.006
0.002
0.004
Yes
Healesville
22
Quarterly
4
0.002
0.001
0.001
Yes
Ivanhoe
55
Quarterly
4
0.015
0.001
0.006
Yes
Kew
53
Quarterly
4
0.003
0.001
0.002
Yes
Lilydale
48
Quarterly
4
0.022
0.002
0.007
Yes
Lower Plenty
16
Quarterly
4
0.013
0.002
0.006
Yes
Lyrebird Avenue
73
Quarterly
4
0.009
0.002
0.005
Yes
Malvern
61
Quarterly
4
0.003
0.002
0.003
Yes
Mernda/Hurstbridge
19
Quarterly
4
0.006
0.002
0.003
Yes
Mitcham
52
Quarterly
4
0.003
0.003
0.003
Yes
Montrose
56
Quarterly
4
0.004
0.002
0.003
Yes
Northcote
10
Quarterly
4
0.007
0.002
0.004
Yes
Plenty
18
Quarterly
4
0.002
0.001
0.001
Yes
Preston
09
Quarterly
4
0.004
0.001
0.002
Yes
Ridge/Monbulk
47
Quarterly
4
0.047
0.001
0.014
Yes
Seville
24
Quarterly
4
0.004
0.001
0.003
Yes
Somerton
12
Quarterly
4
0.003
0.001
0.002
Yes
Wallan
71
Quarterly
4
0.004
0.002
0.004
Yes
Warburton
21
Quarterly
4
0.004
0.001
0.003
Yes
Warranwood
49
Quarterly
4
0.005
0.001
0.003
Yes
Whittlesea
20
Quarterly
4
0.008
0.003
0.005
Yes
Woori Yallock
26
Quarterly
4
0.004
0.001
0.003
Yes
Yarra Glen
23
Quarterly
4
0.004
0.002
0.003
Yes
Yarra Junction
72
Quarterly
4
0.006
0.001
0.003
Yes
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
128
43
APPENDIX
2
RESULTS OF OTHER PARAMETERS
Guideline: Does not exceed 200 mg/L
TABLE 20 – PHYSICAL/CHEMICAL: AESTHETICS – HARDNESS
2014–2015
Water Sampling Locality
Frequency of
Sampling
No. of
Samples
Maximum
(mg/L)
Minimum
(mg/L)
Mean
(mg/L)
Complying
(Yes/No)
Brahams Road
74
Quarterly
4
11
10
11
Yes
Bundoora
14
Quarterly
4
25
23
24
Yes
Croydon
51
Quarterly
4
17
14
16
Yes
Doncaster
50
Quarterly
4
19
10
15
Yes
Eltham
25
Quarterly
4
26
23
25
Yes
Emerald
46
Quarterly
4
26
23
25
Yes
Epping
17
Quarterly
4
26
23
25
Yes
Glen Waverley
60
Quarterly
4
18
15
16
Yes
Glenroy
07
Quarterly
4
20
16
18
Yes
Healesville
22
Quarterly
4
9
6
8
Yes
Ivanhoe
55
Quarterly
4
18
11
15
Yes
Kew
53
Quarterly
4
18
16
17
Yes
Lilydale
48
Quarterly
4
22
16
20
Yes
Lower Plenty
16
Quarterly
4
18
16
17
Yes
Lyrebird Avenue
73
Quarterly
4
15
13
14
Yes
Malvern
61
Quarterly
4
17
16
17
Yes
Mernda/Hurstbridge
19
Quarterly
4
26
21
24
Yes
Mitcham
52
Quarterly
4
18
15
17
Yes
Montrose
56
Quarterly
4
18
15
17
Yes
Northcote
10
Quarterly
4
22
15
19
Yes
Plenty
18
Quarterly
5
25
23
24
Yes
Preston
09
Quarterly
4
23
16
18
Yes
Ridge/Monbulk
47
Quarterly
4
16
9
12
Yes
Seville
24
Quarterly
4
19
16
17
Yes
Somerton
12
Quarterly
4
20
14
17
Yes
Wallan
71
Quarterly
4
19
17
18
Yes
Warburton
21
Quarterly
4
14
12
13
Yes
Warranwood
49
Quarterly
4
20
14
18
Yes
Whittlesea
20
Quarterly
4
66
40
55
Yes
Woori Yallock
26
Quarterly
4
19
12
14
Yes
Yarra Glen
23
Quarterly
4
8
7
7
Yes
Yarra Junction
72
Quarterly
4
15
10
12
Yes
126
-
-
TOTAL
Yarra Valley Water | Drinking Water Quality Report 2014/15
44
APPENDIX
3
TRENDS OVER LOCALITIES AND TIME
Standard: At least 98% of all samples of drinking water collected in any 12-month period to contain no E. coli per 100 mL
TABLE 21 – E. coli
2014–2015
Water Sampling Locality
Locality No.
% Samples with no E. coli
2012/2013
2013/2014
2014/2015
Brahams Road
74
100%
100%
100.0%
Bundoora
14
100%
100%
100.0%
Croydon
51
100%
100%
100.0%
Doncaster
50
100%
100%
100.0%
Eltham
25
100%
100%
99.0%
Emerald
46
100%
100%
100.0%
Epping
17
100%
100%
100.0%
Glen Waverley
60
100%
100%
100.0%
Glenroy
07
100%
100%
100.0%
Healesville
22
100%
100%
100.0%
Ivanhoe
55
100%
100%
100.0%
Kew
53
100%
100%
100.0%
Lilydale
48
100%
100%
100.0%
Lower Plenty
16
100%
100%
100.0%
Lyrebird Avenue
73
100%
100%
100.0%
Malvern
61
100%
100%
100.0%
Mernda/Hurstbridge
19
100%
100%
100.0%
Mitcham
52
100%
100%
100.0%
Montrose
56
100%
100%
100.0%
Northcote
10
100%
100%
100.0%
Plenty
18
100%
100%
100.0%
Preston
09
100%
100%
100.0%
Ridge/Monbulk
47
100%
100%
100.0%
Seville
24
100%
100%
100.0%
Somerton
12
100%
100%
100.0%
Wallan
71
100%
100%
100.0%
Warburton
21
100%
100%
100.0%
Warranwood
49
100%
100%
100.0%
Whittlesea
20
100%
100%
100.0%
Woori Yallock
26
100%
100%
100.0%
Yarra Glen
23
100%
100%
100.0%
Yarra Junction
72
100%
100%
100.0%
Yarra Valley Water | Drinking Water Quality Report 2014/15
45
APPENDIX
3
TRENDS OVER LOCALITIES AND TIME
Standard: 95% Upper Confidence Limit of mean less than or equal to 5.0 Nephelometric Turbidity Units (NTU)
TABLE 22 – TURBIDITY
2014–2015
Water Sampling Locality
Locality No.
95% Upper Confidence Limit of Mean
2012/2013
2013/2014
2014/2015
Brahams Road
74
1.3
1.3
1.5
Bundoora
14
0.4
0.4
0.4
Croydon
51
1.0
0.9
0.9
Doncaster
50
0.9
0.8
0.9
Eltham
25
0.2
0.2
0.3
Emerald
46
1.1
1.0
1.1
Epping
17
0.4
0.3
0.4
Glen Waverley
60
1.1
1.0
1.0
Glenroy
07
1.4
1.0
1.2
Healesville
22
0.3
0.2
0.2
Ivanhoe
55
1.0
0.9
1.0
Kew
53
1.0
0.9
1.0
Lilydale
48
1.1
1.0
1.0
Lower Plenty
16
1.0
0.8
0.9
Lyrebird Avenue
73
2.5
2.5
2.5
Malvern
61
1.1
0.9
0.9
Mernda/Hurstbridge
19
0.4
0.3
0.3
Mitcham
52
1.1
0.9
0.9
Montrose
56
1.0
0.8
0.9
Northcote
10
0.6
0.7
0.8
Plenty
18
0.3
0.3
0.2
Preston
09
0.8
0.8
0.9
Ridge/Monbulk
47
1.1
1.0
1.2
Seville
24
1.0
0.9
0.9
Somerton
12
1.1
0.9
1.0
Wallan
71
1.3
1.1
1.2
Warburton
21
1.5
1.6
1.6
Warranwood
49
1.0
0.9
1.0
Whittlesea
20
0.4
0.4
0.4
Woori Yallock
26
1.6
1.6
1.8
Yarra Glen
23
0.3
0.2
0.2
Yarra Junction
72
1.4
1.5
1.7
Yarra Valley Water | Drinking Water Quality Report 2014/15
46
APPENDIX
4
SAMPLING FREQUENCY VARIATION GAZETTE G22-29 MAY 2014
Yarra Valley Water | Drinking Water Quality Report 2014/15
47