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EWG's Tap Water Database — 2021 UPDATE

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Perfluorooctane sulfonate (PFOS)

Roslyn WD

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.

 

16

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND70ND
2015ND60ND
2016N/A00N/A
2017N/A00N/A
2018ND10ND
2019ND20ND

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.

ppt = parts per trillion

All test results

Date Lab ID Result
2014-08-1435150912001AMND
2014-08-1535150912003AMND
2014-08-1835151461001AAMND
2014-08-2035151913003AMND
2014-08-2035151913001AMND
2014-08-2535152914001AMND
2014-08-2735152914003AMND
2015-02-1035175708001AMND
2015-02-1035175708003AMND
2015-02-1835176234003AMND
2015-02-1835176234001AMND
2015-02-2335177223001AMND
2015-05-0135186828001AMND
2018-09-177065090001ND
2019-01-087075818002ND
2019-04-11200-48344-2ND