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EWG's Tap Water Database — 2021 UPDATE

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Perfluorononanoic acid (PFNA)

Dublin San Ramon Services District

NOTE: Dublin San Ramon Services District purchases water from Zone 7 Water Agency which is required to test for perfluorononanoic acid (pfna). Sample information shown below was taken by Zone 7 Water Agency.

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.

 

46

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND30ND
2014ND10ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018ND70ND
2019ND390ND

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.

ppt = parts per trillion

All test results

NOTE: Dublin San Ramon Services District purchases water from Zone 7 Water Agency which is required to test for perfluorononanoic acid (pfna). Sample information shown below was taken by Zone 7 Water Agency.

Date Lab ID Result
2018-11-289590-001-0940ND
2018-11-289590-005-0910ND
2018-11-289590-023-0950ND
2018-11-289590-007-0930ND
2018-12-049590-019-1000ND
2018-12-049590-013-0920ND
2018-12-049590-008-1040ND
2019-01-029590-012-1030ND
2019-01-029590-023-0940ND
2019-01-029590-017-1000ND
2019-01-029590-011-1045ND
2019-01-029590-024-0950ND
2019-01-029590-006-1100ND
2019-04-089590-024-0950ND
2019-04-089590-007-1130ND
2019-04-089590-023-1010ND
2019-04-089590-017-0916ND
2019-04-099590-012-0935ND
2019-04-099590-013-0955ND
2019-04-099590-019-1040ND
2019-04-099590-006-0920ND
2019-04-179590-007-1340ND
2019-04-179590-020-1400ND
2019-07-089590-021-0950ND
2019-07-089590-020-1130ND
2019-07-089590-005-0720ND
2019-07-089590-019-1045ND
2019-07-089590-017-0925ND
2019-07-089590-024-0905ND
2019-07-089590-023-1020ND
2019-07-089590-011-0945ND
2019-09-059590-006-0930ND
2019-09-059590-013-0920ND
2019-09-059590-007-0910ND
2019-10-079590-001-1325ND
2019-10-079590-020-0920ND
2019-10-079590-013-0945ND
2019-10-079590-012-1015ND
2019-10-079590-008-1210ND
2019-10-079590-007-0830ND
2019-10-079590-006-0900ND
2019-10-089590-017-0830ND
2019-10-089590-024-0930ND
2019-11-049590-019-0900ND
2019-11-049590-023-0840ND
2019-11-059590-026-0935ND