Know Your Environment. Protect Your Health.

Styrene

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Styrene is a volatile cancer-causing chemical used for manufacturing Styrofoam (polystyrene) and other plastics. Releases from industrial production sites and hazardous waste landfills cause styrene contamination in drinking water. Read More.

In addition to increasing the risk of cancer, styrene can also damage the liver and the nervous system. California set a public health goal for styrene in drinking water at 0.5 parts per billion. The federal Maximum Contaminant Level (MCL) allows up to 100 parts per billion of styrene in water, which is 200 times more than the California recommended level.

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23

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0750 ppb42ND - 0.180 ppb
2019ND40ND
2020ND30ND
2021ND40ND
20220.118 ppb42ND - 0.310 ppb
2023ND40ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.5 ppb

The EWG Health Guideline of 0.5 ppb for styrene 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.

EPA Maximum Contaminant
Level (MCL): 100 ppb

The legal limit for styrene, established in 1991, was based on a toxicity study in laboratory animals conducted in the 1970s. This limit may not fully protect against the risk of cancer due to styrene exposure.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-143714230010.120 ppb
2018-05-293851470010.180 ppb
2018-08-22403173001ND
2018-10-23199879ND
2019-03-20436653001ND
2019-06-24453752001ND
2019-08-19464655001ND
2019-12-18487030001ND
2020-05-121188026ND
2020-09-241219644ND
2020-10-211225956ND
2021-01-281238946ND
2021-04-191250918ND
2021-09-011276129ND
2021-11-081289483ND
2022-03-145040671AND
2022-04-055040801A0.310 ppb
2022-07-26520252910.160 ppb
2022-10-1152036553ND
2023-03-2353012772ND
2023-05-1053019602ND
2023-07-1953028169ND
2023-10-0453038727ND