Perfluorooctane sulfonate (PFOS)
Shakopee
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 |
|---|---|---|---|---|
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 5 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | 0.780 ppt | 15 | 6 | ND - 2.80 ppt |
| 2022 | 0.781 ppt | 34 | 19 | ND - 3.80 ppt |
| 2023 | 1.76 ppt | 25 | 25 | 0.390 ppt - 4.20 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 |
|---|---|---|
| 2014-10-22 | K1412093-003 | ND |
| 2014-10-22 | K1412093-007 | ND |
| 2014-10-22 | K1412093-001 | ND |
| 2014-10-22 | K1412093-005 | ND |
| 2014-12-09 | K1413969-001 | ND |
| 2015-04-21 | K1504292-005 | ND |
| 2015-04-21 | K1504292-001 | ND |
| 2015-04-21 | K1504292-007 | ND |
| 2015-04-21 | K1504292-009 | ND |
| 2015-04-21 | K1504292-003 | ND |
| 2021-09-08 | 21I0356-02 | ND |
| 2021-09-08 | 21I0356-15 | ND |
| 2021-09-08 | 21I0356-14 | 2.80 ppt |
| 2021-09-08 | 21I0356-12 | ND |
| 2021-09-08 | 21I0356-01 | 1.60 ppt |
| 2021-09-08 | 21I0356-03 | 1.60 ppt |
| 2021-09-08 | 21I0356-04 | 1.20 ppt |
| 2021-09-08 | 21I0356-05 | 1.80 ppt |
| 2021-09-08 | 21I0356-06 | 2.70 ppt |
| 2021-09-08 | 21I0356-07 | ND |
| 2021-09-08 | 21I0356-08 | ND |
| 2021-09-08 | 21I0356-09 | ND |
| 2021-09-08 | 21I0356-10 | ND |
| 2021-09-08 | 21I0356-11 | ND |
| 2021-09-08 | 21I0356-13 | ND |
| 2022-07-25 | 22G1843-02 | ND |
| 2022-08-17 | 22H1599-10 | ND |
| 2022-08-17 | 22H1599-01 | 0.770 ppt |
| 2022-08-17 | 22H1599-02 | 1.10 ppt |
| 2022-08-17 | 22H1599-03 | 0.680 ppt |
| 2022-08-17 | 22H1599-04 | 3.80 ppt |
| 2022-08-17 | 22H1599-05 | ND |
| 2022-08-17 | 22H1599-06 | 1.10 ppt |
| 2022-08-17 | 22H1599-07 | 2.20 ppt |
| 2022-08-17 | 22H1599-08 | 0.390 ppt |
| 2022-08-17 | 22H1599-09 | 0.430 ppt |
| 2022-08-17 | 22H1599-11 | ND |
| 2022-08-17 | 22H1599-12 | ND |
| 2022-08-17 | 22H1599-13 | ND |
| 2022-08-17 | 22H1599-14 | ND |
| 2022-08-17 | 22H1599-15 | 0.380 ppt |
| 2022-08-17 | 22H1599-16 | ND |
| 2022-10-10 | 22J0335-05 | 0.580 ppt |
| 2022-10-10 | 22J0335-01 | 2.90 ppt |
| 2022-10-10 | 22J0335-02 | 0.950 ppt |
| 2022-10-10 | 22J0335-03 | 1.40 ppt |
| 2022-10-10 | 22J0335-18 | 0.360 ppt |
| 2022-10-10 | 22J0335-16 | ND |
| 2022-10-10 | 22J0335-04 | 2.90 ppt |
| 2022-10-10 | 22J0335-06 | 0.500 ppt |
| 2022-10-10 | 22J0335-07 | 1.80 ppt |
| 2022-10-10 | 22J0335-08 | 0.610 ppt |
| 2022-10-10 | 22J0335-09 | 3.70 ppt |
| 2022-10-10 | 22J0335-10 | ND |
| 2022-10-10 | 22J0335-12 | ND |
| 2022-10-10 | 22J0335-13 | ND |
| 2022-10-10 | 22J0335-14 | ND |
| 2022-10-10 | 22J0335-15 | ND |
| 2022-10-10 | 22J0335-17 | ND |
| 2023-01-10 | 23A0219-01 | 2.40 ppt |
| 2023-01-10 | 23A0219-02 | 2.20 ppt |
| 2023-01-10 | 23A0219-03 | 2.30 ppt |
| 2023-01-10 | 23A0219-04 | 1.50 ppt |
| 2023-01-10 | 23A0219-05 | 1.80 ppt |
| 2023-01-10 | 23A0219-06 | 0.610 ppt |
| 2023-01-10 | 23A0219-07 | 4.20 ppt |
| 2023-05-24 | 23E2661-04 | 0.750 ppt |
| 2023-05-24 | 23E2661-01 | 0.590 ppt |
| 2023-05-24 | 23E2661-02 | 0.390 ppt |
| 2023-05-24 | 23E2661-09 | 3.60 ppt |
| 2023-05-24 | 23E2661-08 | 2.20 ppt |
| 2023-05-24 | 23E2661-07 | 1.90 ppt |
| 2023-05-24 | 23E2661-06 | 1.90 ppt |
| 2023-05-24 | 23E2661-05 | 1.60 ppt |
| 2023-05-24 | 23E2661-03 | 2.50 ppt |
| 2023-08-16 | 23H1896-05 | 0.430 ppt |
| 2023-08-16 | 23H1896-06 | 0.410 ppt |
| 2023-08-16 | 23H1896-07 | 1.80 ppt |
| 2023-08-16 | 23H1896-08 | 0.600 ppt |
| 2023-08-16 | 23H1896-09 | 4.10 ppt |
| 2023-08-16 | 23H1896-04 | 2.40 ppt |
| 2023-08-16 | 23H1896-03 | 1.50 ppt |
| 2023-08-16 | 23H1896-02 | 1.10 ppt |
| 2023-08-16 | 23H1896-01 | 1.20 ppt |