The Power of Information

National Drinking Water Database


Asbestos in California


Asbestos is a mineral fiber introduced into water by the dissolution of asbestos-containing minerals and from decay of asbestos cement in water mains. [read more]

The Most Polluted Communities in California

18 water utilities reported detecting Asbestos in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Asbestos level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1DE Anza Moon Valley Water Company
Sonoma, CA
5001 of 12 MFL
(2 MFL)
2Green Acres Mutual Water
Morgan Hill, CA
5325 of 451.48 MFL
(0 to 8.7 MFL)
3City of Lincoln
Lincoln, CA
7,2241 of 20.8 MFL
(0 to 1.6 MFL)
4Dixon - Solano Mws
Vacaville, CA
7,0221 of 10.58 MFL
(0.58 MFL)
5Bodega Bay Public Utility District
Bodega Bay, CA
1,4951 of 20.33 MFL
(0 to 0.67 MFL)
6Squaw Valley Public Service District
Olympic Valley, CA
9261 of 20.23 MFL
(0 to 0.46 MFL)
7Thermalito Water & Sewer District
Oroville, CA
9,5131 of 10.2 MFL
(0.2 MFL)
8Paradise Irrigation District
Paradise, CA
26,3571 of 10.2 MFL
(0.2 MFL)
9Elkhorn RD WS #04
Watsonville, CA
601 of 10.2 MFL
(0.2 MFL)
10Las Virgenes Mwd
Calabasas, CA
65,0001 of 20.1 MFL
(0 to 0.2 MFL)

Health Based Limits for Asbestos

StandardDescriptionLevel
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.7 MFL
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.7 MFL
California Public Health GoalsDefined by the State of California Office of Environmental Health Hazard Assessment (OEHHA) as the level of contaminant that is allowed in drinking water. For acutely toxic substances, levels are set at which scientific evidence indicates that no known or anticipated adverse effects on health will occur, plus an adequate margin-of safety. PHGs for carcinogens or other substances which can cause chronic disease shall be based solely on health effects without regard to cost impacts and shall be set at levels which OEHHA has determined do not pose any significant risk to health.7 MFL
EPA Human Health Water Quality CriteriaWater quality criteria set by the US EPA provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act (CWA) to protect human health. These are non-enforceable standards based upon exposure by both drinking water and the contribution of water contamination to other consumed foods. Source: U.S. Environmental Protection Agency.7 MFL
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.7 MFL
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.700 MFL

Violation Summary for Asbestos in California

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in California since 2004

Violation TypeNumber of Violations
Over maximum contaminant level, Single Sample2
Failure to monitor regularly2