Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Nob Hill Water Association

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.

 

20

Samples

0

Samples exceeding legal limit (MCL)

0

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
2023ND150ND
2024ND50ND

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
2023-08-144522955ND
2023-08-144522952ND
2023-08-144522959ND
2023-08-144522953ND
2023-08-144522958ND
2023-08-144522957ND
2023-08-144522956ND
2023-08-144522954ND
2023-08-144522961ND
2023-08-144522960ND
2023-10-024531496ND
2023-10-024531491ND
2023-10-024531493ND
2023-10-024531492ND
2023-10-04WDJ0366-01ND
2024-02-08YEB0212-01ND
2024-02-08YEB0212-02ND
2024-06-18YEF0463-01ND
2024-06-18YEF0462-01ND
2024-06-18YEF0461-01ND