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EWG's Tap Water Database — 2021 UPDATE

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Perfluorooctane sulfonate (PFOS)

Spanaway Water Company

Perfluorooctane sulfonate (PFOS) 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.

MORE ABOUT THIS CONTAMINANT

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

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

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 PFOS 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.

EPA Maximum Contaminant
Level (MCL) 4 ppt

ppt = parts per trillion

All test results

Date Lab ID Result
2014-04-15201404160620AMND
2014-04-15201404160827AMND
2014-04-15201404160630AMND
2014-04-21201404220212AMND
2014-04-21201404230367AMND
2014-04-21201404220210AMND
2014-04-21201404220370AMND
2014-04-21201404230324AMND
2014-04-29201404300789AMND
2014-10-06201410070319AMND
2014-10-06201410070303AMND
2014-10-06201410070399AMND
2014-10-06201410070325AMND
2014-10-06201410070305AMND
2014-10-06201410070328AMND
2014-10-07201410080459AMND
2014-10-07201410080423AMND
2014-10-07201410080447AMND