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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Bethpage 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

 

20

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND100ND
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
20190.697 ppt101ND - 6.97 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 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
2013-01-31201302020005AMND
2013-01-31201302020007AMND
2013-01-31201302020003AMND
2013-01-31201302020001AMND
2013-01-31201302140498AMND
2013-07-22201307240487AMND
2013-07-22201307240489AMND
2013-07-22201307240495AMND
2013-07-22201307240491AMND
2013-07-22201307240493AMND
2019-01-297077761001ND
2019-01-307077926006ND
2019-01-307077926007ND
2019-01-307077926003ND
2019-01-307077926005ND
2019-01-307077926004ND
2019-01-307077926002ND
2019-01-307077926001ND
2019-10-05200-50850-3ND
2019-10-05200-50850-16.97 ppt