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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | ND | 8 | 0 | ND |
| 2019 | ND | 12 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 13 | 0 | ND |
| 2022 | 1.08 ppt | 17 | 6 | ND - 7.70 ppt |
| 2023 | 0.342 ppt | 22 | 11 | ND - 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 |
|---|---|---|
| 2018-01-31 | PB0439013118MID | ND |
| 2018-01-31 | PB0489013118PRE | ND |
| 2018-01-31 | PB0489013118POST | ND |
| 2018-05-02 | PB04895218POST515 | ND |
| 2018-05-02 | PB048952118PRE513 | ND |
| 2018-10-31 | WW9878907-POST | ND |
| 2018-10-31 | WW9878906 | ND |
| 2018-10-31 | WW9878908-MID | ND |
| 2019-02-20 | TCP13-05 | ND |
| 2019-02-20 | TCP13-04 | ND |
| 2019-02-21 | TCP13-03 | ND |
| 2019-05-29 | TCP42-03 | ND |
| 2019-05-29 | TCP42-01 | ND |
| 2019-05-29 | TCP42-02 | ND |
| 2019-10-23 | TCP80-01 | ND |
| 2019-10-23 | TCP80-03 | ND |
| 2019-10-23 | TCP80-02 | ND |
| 2019-12-27 | TCE02-03 | ND |
| 2019-12-27 | TCE02-02 | ND |
| 2019-12-27 | TCE02-01 | ND |
| 2020-01-22 | TCE14-01 | ND |
| 2020-01-22 | TCE14-02 | ND |
| 2020-01-22 | TCE14-03 | ND |
| 2021-01-27 | PB0489012721 PRE 513 | ND |
| 2021-02-24 | PB0489022421PRE513 | ND |
| 2021-05-27 | PB0489052721-PRE | ND |
| 2021-05-27 | PB0489052721-POST | ND |
| 2021-05-27 | PB0489052721-MID | ND |
| 2021-08-13 | 410-51384-3 | ND |
| 2021-08-13 | 410-51384-1 | ND |
| 2021-08-13 | 410-51384-2 | ND |
| 2021-09-24 | PB0489092421 POST | ND |
| 2021-09-24 | PB0489092421 PRE 513 | ND |
| 2021-10-22 | 410-60482-5 | ND |
| 2021-11-19 | PB0489111921PRE | ND |
| 2021-12-10 | PB0489121021PRE | ND |
| 2022-01-14 | PB0489011422 PRE | ND |
| 2022-03-25 | 410-77921-3 | ND |
| 2022-03-25 | 410-77921-2 | ND |
| 2022-03-25 | 410-77921-1 | ND |
| 2022-06-06 | 22F0422-02 | 7.70 ppt |
| 2022-06-06 | 22F0422-09 | ND |
| 2022-06-06 | 22G0821-02 | ND |
| 2022-06-06 | 44F0422-03 | 3.50 ppt |
| 2022-06-06 | 22F0422-01 | 5.10 ppt |
| 2022-06-24 | PB0489062422PRE513 | ND |
| 2022-07-29 | PB0489072922-PRE | ND |
| 2022-07-29 | PB0489072922-POST | ND |
| 2022-08-26 | 410-96106-2 | ND |
| 2022-08-26 | 410-96106-6 | ND |
| 2022-10-29 | 410-103907-5 | 0.670 ppt |
| 2022-11-15 | 410-106314-3 | 0.660 ppt |
| 2022-12-22 | 410-110493-5 | 0.660 ppt |
| 2023-01-12 | PB0489011223 | 0.680 ppt |
| 2023-03-30 | PB048903323 PRE513 | 0.660 ppt |
| 2023-04-27 | PB0489042723 PRE 513 | 0.630 ppt |
| 2023-04-27 | PB0489033023 MID514 | ND |
| 2023-04-27 | PB0489042723 MID514 | ND |
| 2023-05-19 | PB0489051923-PRE | 0.520 ppt |
| 2023-05-19 | PB0489051923-MID | ND |
| 2023-06-07 | PB0489060723-PRE | 0.770 ppt |
| 2023-06-07 | PB0489060723-MID | ND |
| 2023-07-28 | PB0489072823MID | ND |
| 2023-07-28 | PB0489072823PRE | 0.610 ppt |
| 2023-08-07 | PB0489080723PRE | 0.770 ppt |
| 2023-08-07 | PB0489080723MID-2 | ND |
| 2023-08-07 | PB0489080723POST | ND |
| 2023-09-22 | PB0489092223POST515 | ND |
| 2023-09-22 | PB0489092223PRE513 | 0.580 ppt |
| 2023-09-29 | PB0489092923POST | ND |
| 2023-10-27 | PB0489102723POST515 | ND |
| 2023-10-27 | PB0489102723PRE513 | 0.780 ppt |
| 2023-11-15 | 410-151526-5-PRE | 0.600 ppt |
| 2023-12-20 | PB0489122023PRE | 0.930 ppt |
| 2023-12-20 | PB0489122023POST | ND |