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National Drinking Water Database


Styrene in California


Styrene is a pollutant from plastics, rubber and other industrial chemical factories and from landfill leachate. [read more]

The Most Polluted Communities in California

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

Ranked by highest average Styrene level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Bass Lake Annex #3
Wishon, CA
421 of 22.25 ppb
(0 to 4.5 ppb)
2Tud - Phoenix Lake Park
Sonora, CA
1521 of 10.62 ppb
(0.62 ppb)
3Tud-Scenic View/Scenic Brook
Sonora, CA
6201 of 10.49 ppb
(0.49 ppb)
4Ridge Mutual Water Company
Los Gatos, CA
2401 of 10.3 ppb
(0.3 ppb)
5Csa 42 Oro Grande
Victorville, CA
7001 of 40.21 ppb
(0 to 0.84 ppb)
6Tud - Crystal Falls Water System
Sonora, CA
6,4121 of 60.05 ppb
(0 to 0.27 ppb)
7California Water Service Co-Leona Valley
Quartz Hill, CA
1,4451 of 120.04 ppb
(0 to 0.5 ppb)
8Calam - Parkway
Sacramento, CA
43,9961 of 1130.02 ppb
(0 to 2 ppb)
9California Water Service - Livermore
Livermore, CA
53,5401 of 114< 0.01 ppb
(0 to 0.13 ppb)

Health Based Limits for Styrene

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.100 ppb
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.100 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.100 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.2000 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.7000 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.20000 ppb

Violation Summary for Styrene 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
Failure to monitor regularly7