Know Your Environment. Protect Your Health.

Perfluorooctane sulfonate (PFOS)

Petersburgh Water 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.

 

75

Samples

0

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND80ND
2019ND120ND
2020ND30ND
2021ND130ND
20221.08 ppt176ND - 7.70 ppt
20230.342 ppt2211ND - 0.930 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
2018-01-31PB0439013118MIDND
2018-01-31PB0489013118PREND
2018-01-31PB0489013118POSTND
2018-05-02PB04895218POST515ND
2018-05-02PB048952118PRE513ND
2018-10-31WW9878907-POSTND
2018-10-31WW9878906ND
2018-10-31WW9878908-MIDND
2019-02-20TCP13-05ND
2019-02-20TCP13-04ND
2019-02-21TCP13-03ND
2019-05-29TCP42-03ND
2019-05-29TCP42-01ND
2019-05-29TCP42-02ND
2019-10-23TCP80-01ND
2019-10-23TCP80-03ND
2019-10-23TCP80-02ND
2019-12-27TCE02-03ND
2019-12-27TCE02-02ND
2019-12-27TCE02-01ND
2020-01-22TCE14-01ND
2020-01-22TCE14-02ND
2020-01-22TCE14-03ND
2021-01-27PB0489012721 PRE 513ND
2021-02-24PB0489022421PRE513ND
2021-05-27PB0489052721-PREND
2021-05-27PB0489052721-POSTND
2021-05-27PB0489052721-MIDND
2021-08-13410-51384-3ND
2021-08-13410-51384-1ND
2021-08-13410-51384-2ND
2021-09-24PB0489092421 POSTND
2021-09-24PB0489092421 PRE 513ND
2021-10-22410-60482-5ND
2021-11-19PB0489111921PREND
2021-12-10PB0489121021PREND
2022-01-14PB0489011422 PREND
2022-03-25410-77921-3ND
2022-03-25410-77921-2ND
2022-03-25410-77921-1ND
2022-06-0622F0422-027.70 ppt
2022-06-0622F0422-09ND
2022-06-0622G0821-02ND
2022-06-0644F0422-033.50 ppt
2022-06-0622F0422-015.10 ppt
2022-06-24PB0489062422PRE513ND
2022-07-29PB0489072922-PREND
2022-07-29PB0489072922-POSTND
2022-08-26410-96106-2ND
2022-08-26410-96106-6ND
2022-10-29410-103907-50.670 ppt
2022-11-15410-106314-30.660 ppt
2022-12-22410-110493-50.660 ppt
2023-01-12PB04890112230.680 ppt
2023-03-30PB048903323 PRE5130.660 ppt
2023-04-27PB0489042723 PRE 5130.630 ppt
2023-04-27PB0489033023 MID514ND
2023-04-27PB0489042723 MID514ND
2023-05-19PB0489051923-PRE0.520 ppt
2023-05-19PB0489051923-MIDND
2023-06-07PB0489060723-PRE0.770 ppt
2023-06-07PB0489060723-MIDND
2023-07-28PB0489072823MIDND
2023-07-28PB0489072823PRE0.610 ppt
2023-08-07PB0489080723PRE0.770 ppt
2023-08-07PB0489080723MID-2ND
2023-08-07PB0489080723POSTND
2023-09-22PB0489092223POST515ND
2023-09-22PB0489092223PRE5130.580 ppt
2023-09-29PB0489092923POSTND
2023-10-27PB0489102723POST515ND
2023-10-27PB0489102723PRE5130.780 ppt
2023-11-15410-151526-5-PRE0.600 ppt
2023-12-20PB0489122023PRE0.930 ppt
2023-12-20PB0489122023POSTND