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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Dtma Main System

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

 

30

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.867 ppt301ND - 26.0 ppt
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
2014-02-18104900PND
2014-02-18104905P26.0 ppt
2014-02-18104908PND
2014-02-18104907PND
2014-02-18104906PND
2014-02-18104902PND
2014-02-19104903PND
2014-02-19104899PND
2014-02-19104912PND
2014-02-19104911PND
2014-02-19104909PND
2014-02-19104904PND
2014-02-19104901PND
2014-02-19104910PND
2014-05-21106963PND
2014-08-18108930PND
2014-08-18108932PND
2014-08-18108935PND
2014-08-18108937PND
2014-08-18108938PND
2014-08-19108926PND
2014-08-19108927PND
2014-08-19108928PND
2014-08-19108929PND
2014-08-19108934PND
2014-08-19108936PND
2014-08-19108920PND
2014-08-20108931PND
2014-10-14109567RND
2014-11-24109694PND