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EWG's Tap Water Database — 2019 UPDATE

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Styrene

City of Nampa

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND10ND
2013ND50ND
2014N/A00N/A
2015N/A00N/A
2016ND130ND
2017ND50ND

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
2012-02-29V58591ND
2013-12-04V1351135ND
2013-12-05V1351273ND
2013-12-12V1352283ND
2013-12-19V1353252ND
2013-12-19V1353246ND
2016-04-20V1616221ND
2016-07-20V1632285ND
2016-10-07V1646180ND
2016-11-17V1652977ND
2016-11-17V1652982ND
2016-11-17V1652993ND
2016-11-17V1652971ND
2016-11-17V1652973ND
2016-11-17V1652975ND
2016-11-17V1652985ND
2016-11-17V1652987ND
2016-11-17V1652991ND
2016-11-17V1652995ND
2017-01-31V1703805ND
2017-01-31V1703804ND
2017-04-11V1714411ND
2017-08-09V1735777ND
2017-10-18V1748770ND