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EWG's Tap Water Database — 2019 UPDATE

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Styrene

Marshall Waterworks

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.

 

45

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND30ND
2013ND130ND
2014ND90ND
2015ND10ND
2016ND90ND
2017ND100ND

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
2012-07-31E120503023ND
2012-07-31E120503025ND
2012-11-27E121000008ND
2013-01-23E121105304ND
2013-01-23E121105301ND
2013-04-30E130202338ND
2013-04-30E130202336ND
2013-07-16E130505808ND
2013-07-16E130505805ND
2013-08-12E130800799ND
2013-08-12E130800798ND
2013-08-30E130804741ND
2013-08-30E130804729ND
2013-08-30E130804753ND
2013-10-07E130803845ND
2013-10-07E130803840ND
2014-01-14E131200005ND
2014-02-10E141204239ND
2014-04-07E140304239ND
2014-07-08E140601326ND
2014-07-08E140601332ND
2014-07-08E140601325ND
2014-08-0438295ND
2014-10-28E140802403ND
2014-10-28E140802398ND
2015-07-14VA010-DCLSND
2016-02-10E151204276ND
2016-02-10E151204275ND
2016-05-11E160303032ND
2016-05-11E160303031ND
2016-07-19E160703075ND
2016-07-19E160703077ND
2016-07-19E160703076ND
2016-12-01E160901673ND
2016-12-01E160901674ND
2017-02-28E161201879ND
2017-02-28E161201878ND
2017-06-20E170302822ND
2017-06-20E170302823ND
2017-08-29E170600341ND
2017-08-30E170600340ND
2017-08-30E170600333ND
2017-08-30E170600336ND
2017-12-06E170805508ND
2017-12-06E170805503ND