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EWG's Tap Water Database — 2021 UPDATE

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Perfluorooctane sulfonate (PFOS)

Wailuku

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

 

43

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND320ND
2015ND110ND
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
2014-05-20201405220554AMND
2014-05-20201405220552AMND
2014-05-20201405220514AMND
2014-05-20201405220557AMND
2014-05-20201405220487AMND
2014-05-20201405220560AMND
2014-05-20201405220511AMND
2014-05-20201405220517AMND
2014-05-20201405220596AMND
2014-05-21201405230211AMND
2014-08-18201408200675AMND
2014-08-18201408210408AMND
2014-08-18201408200666AMND
2014-08-18201408200642AMND
2014-08-18201408200629AMND
2014-08-18201408200593AMND
2014-08-18201408200301AMND
2014-08-18201408200640AMND
2014-08-18201408200604AMND
2014-08-19201409110314AMND
2014-08-28201409030634AMND
2014-11-17201411190281AMND
2014-11-17201411190575AMND
2014-11-17201411190588AMND
2014-11-17201411190711AMND
2014-11-17201411190501AMND
2014-11-18201411200618AMND
2014-11-18201411200419AMND
2014-11-18201411200624AMND
2014-11-18201411200621AMND
2014-11-19201411210530AMND
2014-11-28201412020247AMND
2015-02-17201502191117AMND
2015-02-17201502191080AMND
2015-02-17201502191114AMND
2015-02-17201502191131AMND
2015-02-17201502191194AMND
2015-02-17201502191084AMND
2015-02-17201502191096AMND
2015-02-17201502191171AMND
2015-02-17201502191041AMND
2015-02-18201502210062AMND
2015-02-20201502230428AMND