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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

City of Brentwood

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND190ND
2015ND10ND
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
2014-02-24201402250324AMND
2014-02-24201402250188AMND
2014-02-25201402260651AMND
2014-02-25201402260618AMND
2014-02-26201402270329AMND
2014-02-26201402270193AMND
2014-02-26201402270327AMND
2014-02-27201402280318AMND
2014-05-28201405290453AMND
2014-08-25201408270535AMND
2014-08-25201408260279AMND
2014-08-25201408260401AMND
2014-08-25201408260388AMND
2014-08-28201408300019AMND
2014-08-28201408300021AMND
2014-08-28201408300025AMND
2014-08-28201408300023AMND
2014-08-28201408300027AMND
2014-11-19201411200471AMND
2015-02-19201502200320AMND