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EWG's Tap Water Database — 2021 UPDATE

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Perfluorobutane sulfonate (PFBS)

California American Water Company - Parkway

Perfluorobutane sulfonate (PFBS) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.

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40

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND100ND
2015ND120ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019ND180ND

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 1 ppt

The EWG Health Guideline of 1 ppt for perfluorobutane sulfonate was defined by EWG based on studies by Phillipe Grandjean of Harvard University and many other independent researchers who found reduced effectiveness of vaccines and adverse impacts on mammary gland development from exposure to PFOA and PFOS, the two PFAS most widely detected in drinking water. This health guideline applies to the entire class of PFAS detected in water.

ppt = parts per trillion

All test results

Date Lab ID Result
2014-12-0227680001ND
2014-12-0227681501ND
2014-12-0227679801ND
2014-12-0227680201ND
2014-12-0327681001ND
2014-12-0327681201ND
2014-12-0427680401ND
2014-12-0427680801ND
2014-12-1627680601ND
2014-12-1727681701ND
2015-03-1928476801ND
2015-06-0929308101ND
2015-06-0929307901ND
2015-06-1129308301ND
2015-06-1729308701ND
2015-06-1729308901ND
2015-06-1829307501ND
2015-06-1829308501ND
2015-06-1829306901ND
2015-06-2329307101ND
2015-06-2329307301ND
2015-09-1730238501ND
2019-12-021225-026-1345ND
2019-12-021225-024-1325ND
2019-12-021225-006-1415ND
2019-12-021225-018-1335ND
2019-12-021225-017-1545ND
2019-12-021225-016-1605ND
2019-12-021225-009-1310ND
2019-12-021225-015-1455ND
2019-12-021225-011-1305ND
2019-12-031225-002-1125ND
2019-12-031225-008-1240ND
2019-12-031225-013-1500ND
2019-12-051225-012-1430ND
2019-12-051225-022-1255ND
2019-12-051225-023-1217ND
2019-12-051225-025-1335ND
2019-12-181225-013-1253ND
2019-12-181225-015-1605ND