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EWG's Tap Water Database — 2021 UPDATE

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Perfluorooctane sulfonate (PFOS)

Town of Hempstead Water Department

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

 

38

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND280ND
2015ND20ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
20190.759 ppt83ND - 2.06 ppt

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
2014-06-0935141680007AMND
2014-06-0935141680009AMND
2014-06-1035141680005AMND
2014-06-1035141680011AMND
2014-06-1035141680001AMND
2014-06-1035141680003AMND
2014-06-1135141731005AMND
2014-06-1135141731003AMND
2014-06-1135141731001AMND
2014-06-1235141988005AMND
2014-06-1235141988003AMND
2014-06-1235141988001AMND
2014-06-1835142693001AMND
2014-06-3035144083001AMND
2014-06-3035144083003AMND
2014-12-0835167373003AMND
2014-12-0835167373001AMND
2014-12-0935167822005AMND
2014-12-0935167822001AMND
2014-12-0935167822003AMND
2014-12-1035167821005AMND
2014-12-1035167821003AMND
2014-12-1035167821001AMND
2014-12-1135168101003AMND
2014-12-1135168101001AMND
2014-12-1135168101005AMND
2014-12-2235169266001AMND
2014-12-2235169266003AMND
2015-01-3035174341001AMND
2015-05-2735191351001AMND
2019-05-14200-48799-1ND
2019-09-10200-50505-12.01 ppt
2019-10-10200-50952-32.06 ppt
2019-10-10200-50952-42.00 ppt
2019-10-2570109786002ND
2019-10-2570109786001ND
2019-10-2570109786003ND
2019-10-2570109786004ND