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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Port Washington WD

Perfluorononanoic acid, otherwise known as PFNA or C9, is a PFC similar in function and use to PFOA. These chemicals were used in the production of non-stick, stain repellent and chemically inert coatings. Click here to read more about perfluorinated chemicals.

MORE ABOUT THIS CONTAMINANT

 

25

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND80ND
2014ND80ND
2015N/A00N/A
2016N/A00N/A
201723.5 ppt11ND - 47.0 ppt
2018N/A00N/A
2019ND80ND

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 perfluorononanoic acid 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) 10 ppt

ppt = parts per trillion

All test results

Date Lab ID Result
2013-08-19201308200123AMND
2013-08-19201308200125AMND
2013-08-19201308200121AMND
2013-08-19201308200119AMND
2013-08-19201308200117AMND
2013-08-20201308230182AMND
2013-09-24201309250177AMND
2013-10-28201310300183AMND
2014-02-2035127451011AMND
2014-02-2035127451013AMND
2014-02-2035127451005AMND
2014-02-2035127451009AMND
2014-02-2135127451007AMND
2014-02-2135127451003AMND
2014-02-2135127451001AMND
2014-06-1035141729001AMND
2017-11-0123.5 ppt
2019-02-047078266006ND
2019-02-047078266009ND
2019-02-047078266008ND
2019-02-047078266001ND
2019-02-047078266005ND
2019-02-047078266003ND
2019-02-197080022004ND
2019-10-2170109182002ND