Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Woodinville Water District

NOTE: Woodinville Water District purchases water from Seattle Public Utilities which is required to test for perfluorooctane sulfonate (pfos). Sample information shown below was taken by Seattle Public Utilities.

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.

 

8

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND10ND
2015ND30ND
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022N/A00N/A
2023ND80ND

ppt = parts per trillion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.3 ppt

The EWG Health Guideline of 0.3 ppt for PFOS was defined by EPA's final toxicity value from the Office of Water’s Final Human Health Toxicity Assessment. This health guideline protects againat cardiovascular harm and harm to fetal growth.

EPA Maximum Contaminant
Level (MCL): 4 ppt

ppt = parts per trillion

All test results

NOTE: Woodinville Water District purchases water from Seattle Public Utilities which is required to test for perfluorooctane sulfonate (pfos). Sample information shown below was taken by Seattle Public Utilities.

Date Lab ID Result
2023-06-274569033ND
2023-06-274569036ND
2023-07-184569037ND
2023-07-184569044ND
2023-10-244569042ND
2023-10-244569038ND
2023-12-184583988ND
2023-12-184583989ND