Minnesota Department of Health
Health Risk Assessment Unit
[email protected]
August 2014 Note: This handout was accurate in August 2014.
651-201-4923
See http://www.health.state.mn.us/divs/eh/risk/rules/water/chemicals.html for updates.
Chemicals with guidance values eligible for the Health Risk Limits Rules
Amendments proposed for 2014/2015
Bentazon (CAS # 25057-89-0)
Pesticide (herbicide)
Lowest guidance value: 30 μg/L
Endpoint: Thyroid
Requested by: State Interagency nomination
Occurrence: Detected by MDA in groundwater, including some drinking water wells.
Also detected in some non-drinking water surface water sources, usually <1 μg/L
(MDA/MDH data).
Bisphenol A (CAS # 80-05-7)
Epoxy resin and polycarbonate plastics
Lowest guidance value: 20 μg/L
Endpoint: Liver system, kidney system
Requested by: CEC nominations (NGO, Two state agencies)
Occurrence: Found in wells, especially near landfills. A maximum concentration of
4.4 μg/L was reported in a 2014 USGS report (USGS, 2014).
Butyl Benzyl Phthalate (CAS # 85-68-7)
Use: Plasticizer: flexibility in plastics
Lowest guidance value: 100 μg/L
Endpoint: Developmental (E)
Requested by: CEC nomination (State agency)
Occurrence: Landfill leachate, leaking underground storage tanks, concentration
reported at 5 ppb by MPCA.
Cadmium (CAS # 7440-43-9)
Use: Naturally occurring metal. Used in batteries, paints, inexpensive jewelry, toys
Minnesota Department of Health
Health Risk Assessment Unit
August 2014
Chemicals with guidance values eligible for the Health Risk Limits Rules
Amendments proposed for 2014/2015
Lowest guidance value: 0.5 μg/L
Endpoint: Renal (kidney) system, Skeletal
Requested by: State Interagency nomination, CEC nomination (State agency)
Occurrence: Naturally occurring, or in water impacted by landfill leachate or other
contamination. Some groundwater levels have been reported as high as 4.4 μg/L by
MPCA.
Di (2-ethylhexyl) phthalate (CAS # 117-81-7)
Use: Plasticizer: flexibility in plastics
Lowest guidance value: 7 μg/L
Endpoint: Cancer
Requested by: CEC nomination (State agency)
Occurrence: Found in landfill leachate or areas affected by leaking tanks.
Dibutyl phthalate (CAS # 84-74-2)
Use: Plasticize: flexibility in plastics
Lowest guidance value: 20 μg/L
Endpoint: Developmental (E)
Requested by: CEC nomination (State agency)
Occurrence: Found in landfill leachate or areas affected by leaking tanks.
Dimethenamid (CAS #87674-68-8) and Dimethenamid-p (CAS # 163515-14-8)
Use: Pesticide (herbicide)
Lowest guidance value: 300 μg/L
Endpoint: Liver system
Requested by: State Interagency nomination
Occurrence: Found in a small number of drinking water wells. In 2012, MDA
[email protected]
651-201-4923
Minnesota Department of Health
Health Risk Assessment Unit
August 2014
Chemicals with guidance values eligible for the Health Risk Limits Rules
Amendments proposed for 2014/2015
reported maximum detections of 0.89 μg/L. Degradates were detected at 2.74 μg/L
(ESA) and 2.18 μg/L (OXA) (MDA, 2013). In 2013, MDA reported maximum
detections of 0.357 μg/L. Degradates were detected at 1.02 μg/L (ESA) and 1.47 μg/L
(OXA) (MDA, 2014).
Pentachlorophenol (CAS # 87-86-5)
Use: Pesticide, preservative, and disinfectant
Lowest guidance value: 0.3 μg/L
Endpoint: Cancer
Requested by: State Interagency nomination
Occurrence: Historically, found in groundwater at many sites throughout the state.
Concentrations were reported at 8000 μg/L or more. In recent years, concentrations
have been below 0.3 μg/L (MDH, 2013).
Sulfamethazine (CAS # 57-68-1)
Use: Antibiotic
Lowest guidance value: 100 μg/L
Endpoint: Thyroid
Requested by: CEC nomination (State agency)
Occurrence: Found in wells at a maximum concentration of 0.040 μg/L (USGS,
2014).
1,1,2-Trichloroethylene (TCE) (CAS # 79-01-6)
Use: Solvent, degreaser
Lowest guidance value: 0.4 μg/L
Endpoint: Developmental, Immune
Requested by: State Interagency nomination
Occurrence: Periodically found in groundwater in Minnesota because of widespread
use of TCE. Concentrations vary, but TCE was reportedly found as high as 40 μg/L in
[email protected]
651-201-4923
Minnesota Department of Health
Health Risk Assessment Unit
August 2014
Chemicals with guidance values eligible for the Health Risk Limits Rules
Amendments proposed for 2014/2015
a well in 2012 (MDH/MPCA data).
Triclosan (CAS # 3380-34-5)
Use: Antimicrobial
Lowest guidance value: 50 μg/L
Endpoint: Thyroid (E), Female reproductive system
Requested by: CEC nomination (State agency)
Occurrence: Surface water contaminant. Found at concentrations of 4.3 μg/L in
wastewater and 0.31 μg/L in Minnesota streams (MDH, 2014).
CAS # = Chemical Abstract Service Number
CEC = Contaminants of Emerging Concern
EPA = Environmental Protection Agency
MDA = Minnesota Department of Agriculture
MDH = Minnesota Department of Health
MPCA = Minnesota Pollution Control Agency
NGO = Non-governmental Organization
References:
MDA (Minnesota Department of Agriculture). 2013. 2012 Water Quality Monitoring Report.
(http://www.mda.state.mn.us/chemicals/pesticides/~/media/Files/chemicals/maace/2012wqm.ashx)
MDA. 2014. 2013 Water Quality Monitoring Report
(http://www.mda.state.mn.us/chemicals/pesticides/~/media/Files/chemicals/maace/2013wqmreport.pdf)
MDH (Minnesota Department of Health). 2013. Pentachlorophenol and Drinking Water
(http://www.health.state.mn.us/divs/eh/risk/guidance/gw/pcpinfosht.pdf)
MDH. 2014. Triclosan and Drinking Water.
(http://www.health.state.mn.us/divs/eh/risk/guidance/dwec/triclosaninfo.pdf )
USGS (United States Geological Survey). 2014. Contaminants of Emerging Concern in Ambient
Groundwater in Urbanized Areas of Minnesota, 2009–12
(http://pubs.usgs.gov/sir/2014/5096/pdf/sir2014-5096.pdf )
[email protected]
651-201-4923