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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Ayer DPW Water Division

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

 

113

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016ND20ND
2017ND160ND
2018ND430ND
20190.248 ppt5210ND - 1.92 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 Result
2016-09-01ND
2016-11-15ND
2017-01-01ND
2017-01-11ND
2017-01-11ND
2017-01-11ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-04-12ND
2017-08-03ND
2017-08-03ND
2017-08-03ND
2017-08-03ND
2017-10-17ND
2017-10-17ND
2017-10-17ND
2017-10-17ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-01-09ND
2018-02-08ND
2018-02-12ND
2018-03-01ND
2018-03-01ND
2018-03-01ND
2018-03-07ND
2018-03-07ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-04-23ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-08-24ND
2018-10-25ND
2018-10-25ND
2018-10-25ND
2018-10-25ND
2018-10-25ND
2018-10-25ND
2018-10-25ND
2018-10-25ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-02-20ND
2019-05-21ND
2019-05-21ND
2019-05-21ND
2019-06-27ND
2019-06-27ND
2019-07-03ND
2019-07-03ND
2019-07-031.87 ppt
2019-08-021.52 ppt
2019-08-02ND
2019-08-02ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-08-20ND
2019-09-031.64 ppt
2019-09-03ND
2019-09-03ND
2019-09-03ND
2019-10-031.92 ppt
2019-10-03ND
2019-10-03ND
2019-10-03ND
2019-11-11ND
2019-11-11ND
2019-11-180.816 ppt
2019-11-180.509 ppt
2019-11-180.816 ppt
2019-11-220.632 ppt
2019-11-221.42 ppt
2019-11-221.75 ppt
2019-12-10ND
2019-12-10ND
2019-12-10ND
2019-12-10ND