Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Regional Water Authority

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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

7

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
20231.34 ppt154ND - 8.10 ppt
20241.31 ppt153ND - 10.7 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
2023-09-1867914701ND
2023-09-1867914001ND
2023-09-1867914101ND
2023-09-18679144014.00 ppt
2023-09-1867914301ND
2023-09-1867914201ND
2023-09-19679151014.00 ppt
2023-09-1967914901ND
2023-09-20679148018.10 ppt
2023-09-2767914601ND
2023-11-27688472014.00 ppt
2023-12-1368756001ND
2023-12-1368755901ND
2023-12-1368755801ND
2023-12-1368755701ND
2024-03-1869472901ND
2024-03-1869472801ND
2024-03-18694731014.60 ppt
2024-03-1869473001ND
2024-03-186947350110.7 ppt
2024-03-1869472701ND
2024-03-1869473401ND
2024-03-1969473701ND
2024-03-19694732014.30 ppt
2024-03-2069473601ND
2024-03-2069473301ND
2024-06-1170421001ND
2024-06-1170420901ND
2024-06-1170420801ND
2024-06-1170421101ND