Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Portland

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.000 ppt41ND - 4.00 ppt
2019N/A00N/A
2020N/A00N/A
20211.15 ppt134ND - 4.00 ppt
20221.25 ppt84ND - 4.00 ppt
20231.25 ppt41ND - 5.00 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
2018-09-25GWEF1809251340KERND
2018-09-25GWEF1809251300KERND
2018-09-25GWNT1809251245KER4.00 ppt
2018-09-25GWEF1809251320KERND
2021-01-19LJ415884.00 ppt
2021-01-19LJ41587ND
2021-01-19LJ41589ND
2021-01-19LJ41586ND
2021-03-25LJ491254.00 ppt
2021-03-254.00 ppt
2021-09-14ND
2021-09-14LJ78179ND
2021-09-14ND
2021-09-14ND
2021-09-14LJ781783.00 ppt
2021-09-14LJ78177ND
2021-09-14LJ78176ND
2022-08-23LK29741ND
2022-08-23LK297394.00 ppt
2022-08-23LK29742ND
2022-08-23LK297401.000 ppt
2022-08-231.000 ppt
2022-08-23ND
2022-08-23ND
2022-08-234.00 ppt
2023-09-18ND
2023-09-185.00 ppt
2023-09-18ND
2023-09-18ND