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EWG's Tap Water Database — 2021 UPDATE

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Perfluoroheptanoic acid (PFHPA)

Norwalk Water Department

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

 

21

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013ND170ND
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
20190.450 ppt41ND - 1.80 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 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
2013-03-18440-41265-5ND
2013-03-18440-41265-1ND
2013-03-18440-41265-3ND
2013-03-18440-41265-7ND
2013-04-04440-42854-3ND
2013-04-04440-42854-1ND
2013-04-30440-45114-1ND
2013-06-03440-47996-1ND
2013-07-292869325ND
2013-07-292869344ND
2013-07-292869362ND
2013-07-292869353ND
2013-07-292869308ND
2013-07-292869297ND
2013-10-292922264ND
2013-10-292922273ND
2013-10-292922284ND
2019-07-259588-002-10351.80 ppt
2019-07-259588-012-0930ND
2019-07-259588-003-1010ND
2019-10-259588-002-1000ND