Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

San Miguel Community Services District

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018N/A00N/A
2019N/A00N/A
2020N/A00N/A
20211.05 ppt21ND - 2.10 ppt
2022N/A00N/A
20231.35 ppt84ND - 3.10 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
2021-04-26CA4010010_004_004-202104260735ND
2021-04-26CA4010010_005_005-2021042608302.10 ppt
2023-01-24CA4010010_004_004-202301240725ND
2023-01-24CA4010010_005_005-2023012407182.30 ppt
2023-04-04CA4010010_005_005-2023040409002.90 ppt
2023-04-04CA4010010_004_004-202304040839ND
2023-07-11CA4010010_005_005-2023071108172.50 ppt
2023-07-11CA4010010_004_004-202307110802ND
2023-10-10CA4010010_004_004-202310100732ND
2023-10-10CA4010010_005_005-2023101007153.10 ppt