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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Metropolitan DWID

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

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND230ND
2015ND230ND
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
2014-08-06201408070497AMND
2014-08-06201408070495AMND
2014-08-18201408190665AMND
2014-08-18201408190663AMND
2014-08-18201408190667AMND
2014-08-18201408190500AMND
2014-08-18201408190498AMND
2014-08-18201408190496AMND
2014-08-19201408200415AMND
2014-08-19201408200437AMND
2014-08-19201408200439AMND
2014-08-19201408200419AMND
2014-08-19201408200417AMND
2014-08-19201408200435AMND
2014-08-19201408200433AMND
2014-08-20201408210484AMND
2014-08-20201408210488AMND
2014-08-20201408210480AMND
2014-08-20201408210492AMND
2014-08-20201408210482AMND
2014-08-20201408210490AMND
2014-08-25201408260297AMND
2014-09-22201409230534AMND
2015-02-17201502180793AMND
2015-02-17201502180768AMND
2015-02-17201502180791AMND
2015-02-17201502180797AMND
2015-02-17201502180770AMND
2015-02-17201502180795AMND
2015-02-18201502190759AMND
2015-02-18201502190757AMND
2015-02-18201502190761AMND
2015-02-18201502190763AMND
2015-02-18201502190975AMND
2015-02-18201502190977AMND
2015-02-19201502200382AMND
2015-02-19201502200207AMND
2015-02-19201502200213AMND
2015-02-19201502200211AMND
2015-02-19201502200386AMND
2015-02-19201502200209AMND
2015-02-19201502200384AMND
2015-02-24201502250889AMND
2015-02-24201502250887AMND
2015-03-23201503100114AMND
2015-08-31201509010996AMND