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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Regional Water Authority

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

 

28

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND280ND
2015N/A00N/A
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 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
2014-01-21200389837 AND
2014-01-21200389843 AND
2014-01-21200389853 AND
2014-01-21200389855 AND
2014-01-21200389841 AND
2014-01-21200389845 AND
2014-01-21200389835 AND
2014-01-21200389833 AND
2014-01-21200389839 AND
2014-01-22200389861 AND
2014-04-29200394919ND
2014-04-29200394914ND
2014-04-29200394927ND
2014-04-29200394923ND
2014-07-15200399797ND
2014-07-15200399799ND
2014-07-15200399796ND
2014-07-15200399794ND
2014-07-15200399795ND
2014-07-15200399798ND
2014-07-15200399801ND
2014-07-15200399800ND
2014-07-15200399793ND
2014-07-15200399792ND
2014-10-21200406627ND
2014-10-21200406619ND
2014-10-21200406621ND
2014-10-21200406625ND