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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Water Authority of Western Nassau

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

 

26

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.57 ppt71ND - 32.0 ppt
2015ND110ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
20191.55 ppt81ND - 12.4 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 Lab ID Result
2014-12-2335169517003AM32.0 ppt
2014-12-2335169517001AMND
2014-12-2335169517007AMND
2014-12-2335169517013AMND
2014-12-2335169517005AMND
2014-12-2335169517011AMND
2014-12-2335169517009AMND
2015-06-2535195584001AMND
2015-06-2535195584003AMND
2015-07-2135200053013AMND
2015-07-2135200053005AMND
2015-07-2135200053003AMND
2015-07-2135200053007AMND
2015-07-2335200053011AMND
2015-07-2335200053009AMND
2015-07-2335200053001AMND
2015-12-2235222547003AMND
2015-12-2235222547001AMND
2019-07-317099537002ND
2019-07-317099537001ND
2019-08-017099672003ND
2019-08-017099672001ND
2019-12-0470116884002ND
2019-12-1370115410004ND
2019-12-137011540800212.4 ppt
2019-12-1370115410003ND