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EWG's Tap Water Database — 2019 UPDATE

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Styrene

City of Manteca

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.

Click here to read more about carcinogenic VOCs.

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND50ND
2014ND60ND
2015ND50ND
2016ND40ND
2017ND60ND

ppb = parts per billion

State and national drinking water standards and health guidelines

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
2012-02-085810-049-1130ND
2012-02-085810-040-1035ND
2012-03-135810-013-1000ND
2012-06-125810-049-0717ND
2012-11-135810-044-1033ND
2013-03-135810-032-0640ND
2013-04-105810-012-0805ND
2013-06-055810-038-0745ND
2013-06-055810-034-0825ND
2013-08-145810-014-0810ND
2014-01-145810-042-1055ND
2014-01-145810-036-0906ND
2014-02-115810-030-0835ND
2014-06-105810-015-0720ND
2014-07-085810-016-0715ND
2014-07-085810-028-0803ND
2015-02-105810-040-0820ND
2015-06-095810-049-0650ND
2015-07-215810-034-0812ND
2015-11-305810-044-1005ND
2015-12-095810-013-0625ND
2016-03-085810-032-0540ND
2016-04-195810-012-0920ND
2016-06-145810-038-0645ND
2016-08-235810-014-0715ND
2017-01-095810-042-0947ND
2017-01-095810-036-1030ND
2017-04-045810-042-0535ND
2017-07-105810-028-0847ND
2017-07-105810-016-0800ND
2017-08-085810-015-0625ND