Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

California Water Service Company Oak Hills

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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015N/A00N/A
2016N/A00N/A
2017N/A00N/A
2018N/A00N/A
2019N/A00N/A
2020ND30ND
2021N/A00N/A
2022N/A00N/A
2023ND90ND
2024ND10ND

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
2020-05-04CA2710019_008_008-202005041030ND
2020-05-07CA2710019_001_001-202005071005ND
2020-08-06CA2710019_003_003-202008061210ND
2023-05-22103699PND
2023-05-22103700PND
2023-11-07CA2710019_003_003-202311071424ND
2023-11-07CA2710019_008_008-202311071403ND
2023-11-15CA2710019_008_008-202311151034ND
2023-11-15CA2710019_003_003-202311151018ND
2023-11-21CA2710019_001_001-202311211308ND
2023-11-21CA2710019_001_001-202311211309ND
2023-12-18110232PND
2024-01-22112719RND