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EWG's Tap Water Database — 2021 UPDATE

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Perfluorooctane sulfonate (PFOS)

Artesian Water Company

Perfluorooctane sulfonate (PFOS) is a member of a group of perfluorinated chemicals used in many consumer products. PFOS and other 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

 

61

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201361.7 ppt182ND - 930.0 ppt
2014107.2 ppt182ND - 1,800.0 ppt
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
20180.333 ppt61ND - 2.00 ppt
2019ND190ND

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 PFOS 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) 4 ppt

ppt = parts per trillion

All test results

Date Lab ID Result
2013-07-172860772ND
2013-07-172860817ND
2013-07-172860386ND
2013-07-172860886ND
2013-07-172860837ND
2013-07-172860509180.0 ppt
2013-07-172860195ND
2013-07-172860941ND
2013-07-172860336ND
2013-07-172860259ND
2013-07-172860375ND
2013-07-172860417ND
2013-07-172860744930.0 ppt
2013-07-172860759ND
2013-07-172860930ND
2013-07-172860347ND
2013-08-122875563ND
2013-10-152913847ND
2014-01-282964215ND
2014-01-2829641851,800.0 ppt
2014-01-282964145ND
2014-01-282964204ND
2014-01-282964089ND
2014-01-282964162ND
2014-01-282964127ND
2014-01-282964039ND
2014-01-282964101ND
2014-01-282964242ND
2014-01-282964073ND
2014-01-282964229ND
2014-01-282964112ND
2014-01-282964271130.0 ppt
2014-01-282964058ND
2014-01-282964254ND
2014-04-233014331ND
2014-07-163064487ND
2018-07-233999658ND
2018-07-2339996572.00 ppt
2018-07-233999649ND
2018-07-233999659ND
2018-11-194129537ND
2018-12-104147794ND
2019-01-224183411ND
2019-01-224183405ND
2019-01-224183403ND
2019-01-224183395ND
2019-01-244183416ND
2019-04-024248533ND
2019-04-024248540ND
2019-04-024248536ND
2019-04-024248537ND
2019-04-154260884ND
2019-07-174358342ND
2019-07-174358301ND
2019-07-174358293ND
2019-07-174358280ND
2019-10-154457901ND
2019-10-154457896ND
2019-10-154457881ND
2019-10-294470683ND
2019-12-194521693ND