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EWG's Tap Water Database — 2021 UPDATE

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Perfluoroheptanoic acid (PFHPA)

San Lorenzo Valley Water District

Perfluoroheptanoic acid is a member of a group of perfluorinated chemicals used in many consumer products. Perfluorinated chemicals can cause serious health effects, including cancer, endocrine disruption, accelerated puberty, liver and immune system damage, and thyroid changes. These chemicals are persistent in the environment and they accumulate in people. Click here to read more about perfluorinated chemicals.

MORE ABOUT THIS CONTAMINANT

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND160ND
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019ND60ND

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 perfluoroheptanoic 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

Date Lab ID Result
2014-01-21201401230101AMND
2014-01-21201401230103AMND
2014-01-22201401280188AMND
2014-01-22201401280185AMND
2014-01-27201401290321AMND
2014-01-28201401300126AMND
2014-01-28201401300128AMND
2014-04-23201404250083AMND
2014-07-09201407110262AMND
2014-07-09201407110260AMND
2014-07-15201407170536AMND
2014-07-16201407180199AMND
2014-07-16201407180197AMND
2014-07-16201407180184AMND
2014-07-16201407180201AMND
2014-10-14201410160335AMND
2019-04-299590-026-0847ND
2019-04-299590-025-0855ND
2019-07-299590-026-0800ND
2019-07-299590-025-0815ND
2019-10-149590-026-0900ND
2019-10-149590-025-0930ND