Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Whitworth Water District 2

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.

 

23

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
2022N/A00N/A
20230.324 ppt131ND - 4.21 ppt
20240.460 ppt101ND - 4.60 ppt

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

Date Lab ID Result
2023-10-164538491ND
2023-10-164538492ND
2023-10-164538490ND
2023-10-174540099ND
2023-10-174540082ND
2023-10-174540090ND
2023-10-184540071ND
2023-10-184540076ND
2023-10-2345393554.21 ppt
2023-10-234539605ND
2023-10-234539354ND
2023-10-244538610ND
2023-10-244538611ND
2024-01-22WEA0608-01ND
2024-04-01WED0034-01ND
2024-04-01WED0034-02ND
2024-04-01WED0034-03ND
2024-04-02WED0144-01ND
2024-04-02WED0144-034.60 ppt
2024-04-02WED0144-02ND
2024-04-10WED0494-01ND
2024-04-10WED0494-02ND
2024-07-01WEG0044-01ND