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EWG's Tap Water Database — 2019 UPDATE

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Styrene

Florin County Water District

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND40ND
2014ND70ND
2015ND170ND
2016N/A00N/A
2017N/A00N/A

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
2012-05-305810-009-0956ND
2012-08-295810-003-0937ND
2013-04-155810-012-1325ND
2013-07-185810-007-0914ND
2013-12-125810-007-0950ND
2013-12-125810-006-1427ND
2014-04-305810-002-1017ND
2014-04-305810-003-0927ND
2014-04-305810-004-1054ND
2014-04-305810-006-1241ND
2014-04-305810-007-0841ND
2014-04-305810-009-1200ND
2014-08-075810-010-1305ND
2015-02-115810-009-1216ND
2015-02-115810-007-0906ND
2015-02-115810-010-1305ND
2015-02-115810-012-0948ND
2015-02-115810-006-1402ND
2015-02-115810-004-1115ND
2015-05-275810-003-1012ND
2015-05-275810-012-0923ND
2015-05-275810-009-1159ND
2015-05-275810-004-1053ND
2015-05-275810-006-1258ND
2015-09-235810-003-1044ND
2015-09-235810-004-1147ND
2015-09-235810-006-1336ND
2015-09-235810-007-0932ND
2015-09-235810-009-1247ND
2015-09-235810-012-1009ND