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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

City of Lathrop

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

 

24

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND70ND
2014ND10ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019ND160ND

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
2013-04-17A3C1742-04AND
2013-04-17A3C1742-07AND
2013-04-17A3C1742-01AND
2013-07-30A3F1565-01AND
2013-10-15A3I1433-01AND
2013-10-15A3I1434-01AND
2013-10-15A3I1433-04AND
2014-01-21A3L1662-01AND
2019-05-062371-008-0756ND
2019-05-062371-016-0814ND
2019-06-172371-008-0820ND
2019-06-172371-016-0838ND
2019-07-102371-006-0918ND
2019-07-102371-007-0850ND
2019-07-102371-005-0905ND
2019-07-222371-016-1004ND
2019-08-052371-016-0954ND
2019-08-052371-008-0936ND
2019-08-052371-007-0908ND
2019-08-052371-006-0832ND
2019-08-052371-005-0850ND
2019-10-149588-016-0918ND
2019-12-099588-016-0848ND
2019-12-099588-008-0830ND