EWG's drinking water quality report shows
results of tests conducted by the water utility and provided to the Environmental Working Group by the California State Water Resources Control Board, as well as
information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the EPA (July 2017 - September 2017), tap water provided by this water utility was in compliance with federal health-based drinking water standards.
Includes chemicals detected in 2015 for which annual utility averages exceeded an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015, for which annual utility averages exceeded a health guideline established by a federal or state public health authority; radiological contaminants detected between 2010 and 2015.
Arsenic
cancer✕
Arsenic is a potent carcinogen and common contaminant in drinking water. Arsenic causes thousands of cases of cancer each year in the U.S. Click here to read more about arsenic.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.004 ppb
LEGAL LIMIT: 10 ppb
1.30 ppb
2.94 ppb
6.50 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of arsenic in excess of health guideline
The health guideline of 0.004 ppb for arsenic was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.06 ppb
4.38 ppb
3.53 ppb
4.31 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of bromodichloromethane in excess of health guideline
The health guideline of 0.06 ppb for bromodichloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.5 ppb
1.77 ppb
3.02 ppb
1.15 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of bromoform in excess of health guideline
The health guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Chloroform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Chloroform and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.4 ppb
11.5 ppb
8.02 ppb
20.4 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of chloroform in excess of health guideline
The health guideline of 0.4 ppb for chloroform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Chromium (hexavalent) is a carcinogen that commonly contaminates American drinking water. Chromium (hexavalent) in drinking water may be due to industrial pollution or natural occurrences in mineral deposits and groundwater. Read more about chromium (hexavalent).
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.02 ppb
0.782 ppb
1.69 ppb
0.257 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.
Health risks of chromium (hexavalent) in excess of health guideline
The health guideline of 0.02 ppb for chromium (hexavalent) was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.1 ppb
3.01 ppb
3.85 ppb
1.54 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of dibromochloromethane in excess of health guideline
The health guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Dichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.7 ppb
6.07 ppb
4.04 ppb
7.33 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of dichloroacetic acid in excess of health guideline
The health guideline of 0.7 ppb for dichloroacetic acid was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Manganese is a naturally occurring element that is common in food and drinking water. Excessive manganese exposures may impair children's attention, memory and intellectual capacity. Click here to read more about manganese.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 100 ppb
28.1 ppb
52.4 ppb
113.8 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of manganese in excess of health guideline
The health guideline of 100 ppb for manganese was defined by Minnesota as a risk assessment advisory level, a non-enforceable guideline. This health guideline protects against harm to the brain and nervous system.
Radiological contaminants leach into water from certain minerals and from mining. Drinking water contamination with radioactive substances increases the risk of cancer and may harm fetal development.
Total trihalomethanes (TTHMs)
cancer✕
Trihalomethanes are cancer-causing contaminants that form during water treatment with chlorine and other disinfectants. The total trihalomethanes group includes four chemicals: chloroform, bromodichloromethane, dibromochloromethane and bromoform.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.8 ppb
LEGAL LIMIT: 80 ppb
23.7 ppb
20.1 ppb
36.0 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of trihalomethanes in excess of health guideline
The health guideline of 0.8 ppb for trihalomethanes was defined by the California Office of Environmental Health Hazard Assessment as a draft public health goal, the level of drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 0.5 ppb
4.96 ppb
3.90 ppb
11.4 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of trichloroacetic acid in excess of health guideline
The health guideline of 0.5 ppb for trichloroacetic acid was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
Includes chemicals detected in 2015 for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority; chemicals detected under the EPA's Unregulated Contaminant Monitoring Rule (UCMR 3) program in 2013 to 2015, for which annual utility averages were lower than an EWG-selected health guideline established by a federal or state public health authority.
Barium
✕
Barium is a mineral present in rocks, soil and water. High concentrations of barium in drinking water increase the risk of cardiovascular disease and hypertension.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 700 ppb
LEGAL LIMIT: 2,000 ppb
68.2 ppb
44.4 ppb
160.0 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Health risks of barium in excess of health guideline
The health guideline of 700 ppb for barium was defined by the Environmental Protection Agency as a children's health-based limit for 10-day exposure, a non-enforceable federal health advisory. This health guideline protects against harm to internal organs.
Chlorate forms in drinking water as a byproduct of disinfection. Chlorate impairs thyroid function, making chlorate exposure most harmful during pregnancy and childhood.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 210 ppb
114.0 ppb
128.7 ppb
71.1 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.
Health risks of chlorate in excess of health guideline
The health guideline of 210 ppb for chlorate was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against hormone disruption.
Chromium is a naturally occurring metal, but industrial uses can elevate its levels in water. One form, hexavalent chromium, causes cancer. Total chromium is not a good indicator of the amount of hexavalent chromium in drinking water.
STATE
NATIONAL
THIS UTILITY
How your levels compare
LEGAL LIMIT: 100 ppb
0.637 ppb
1.54 ppb
0.139 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.
Dibromoacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
STATE
NATIONAL
THIS UTILITY
How your levels compare
1.15 ppb
1.96 ppb
0.419 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Haloacetic acids are formed when disinfectants such as chlorine are added to tap water. The group of five haloacetic acids regulated by federal standards includes monochloroacetic acid, dichloroacetic acid, trichloroacetic acid, monobromoacetic acid and dibromoacetic acid.
STATE
NATIONAL
THIS UTILITY
How your levels compare
LEGAL LIMIT: 60 ppb
12.9 ppb
11.0 ppb
21.7 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2015. ppb = parts per billion.
Molybdenum is a metal that occurs naturally in soil, minerals and water. People who ingest large amounts can have increased levels of uric acid and gout-like symptoms.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 40 ppb
1.61 ppb
4.12 ppb
0.572 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.
Health risks of molybdenum in excess of health guideline
The health guideline of 40 ppb for molybdenum was defined by the Environmental Protection Agency as a lifetime health-based limit for effects other than cancer. This health guideline protects against an increased risk of gout.
Strontium is a metal that accumulates in the bones. Radioactive strontium-90 can cause bone cancer and leukemia, and any form of strontium at high doses can harm bone health.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 1,500 ppb
357.2 ppb
443.1 ppb
125.6 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.
Health risks of strontium in excess of health guideline
The health guideline of 1,500 ppb for strontium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against harm to bones.
Vanadium is a metal used in steels and other alloys. People are commonly exposed to vanadium in water and food. Excessive exposure can be toxic during pregnancy and childhood.
STATE
NATIONAL
THIS UTILITY
How your levels compare
HEALTH GUIDELINE: 21 ppb
1.98 ppb
7.27 ppb
2.16 ppb
The State and National averages were calculated using the averages of the contaminant measurements for each utility in 2010-2015. ppb = parts per billion.
Health risks of vanadium in excess of health guideline
The health guideline of 21 ppb for vanadium was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against change in blood chemistry.
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