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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

City of Boerne

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
2013ND80ND
2014ND120ND
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
2013-12-30Q1319561007ND
2013-12-30Q1319561009ND
2013-12-30Q1319561005ND
2013-12-30Q1319561003ND
2013-12-30Q1319561013ND
2013-12-30Q1319561001ND
2013-12-30Q1319561015ND
2013-12-30Q1319561011ND
2014-03-05Q1406828003ND
2014-03-05Q1406828001ND
2014-06-24Q1423083015ND
2014-06-24Q1423083007ND
2014-06-24Q1423083001ND
2014-06-24Q1423083005ND
2014-06-24Q1423083013ND
2014-06-24Q1423083011ND
2014-06-24Q1423083009ND
2014-06-24Q1423083003ND
2014-09-15Q1443985003ND
2014-09-15Q1443985001ND