Perfluorooctane sulfonate (PFOS)
Woodbury
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 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 | 6.67 ppt | 49 | 13 | ND - 36.0 ppt |
| 2021 | 5.47 ppt | 91 | 35 | ND - 31.0 ppt |
| 2022 | 4.85 ppt | 85 | 40 | ND - 28.0 ppt |
| 2023 | 3.93 ppt | 91 | 32 | ND - 33.0 ppt |
| 2024 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2020-01-21 | 20A0771-01 | ND |
| 2020-06-22 | 20F1776-02 | 15.0 ppt |
| 2020-06-22 | 20F1776-03 | 27.0 ppt |
| 2020-06-22 | 20F1776-04 | 26.0 ppt |
| 2020-06-22 | 20F1777-01 | 21.0 ppt |
| 2020-06-22 | 20F1777-02 | 22.0 ppt |
| 2020-06-22 | 20F1777-03 | ND |
| 2020-06-22 | 20F1777-04 | ND |
| 2020-06-22 | 20F1778-01 | ND |
| 2020-06-22 | 20F1778-02 | ND |
| 2020-06-22 | 20F1778-03 | ND |
| 2020-06-22 | 20F1778-04 | ND |
| 2020-06-22 | 20F1779-01 | ND |
| 2020-06-22 | 20F1779-02 | ND |
| 2020-08-25 | 20H1965-02 | ND |
| 2020-08-25 | 20H1965-03 | ND |
| 2020-08-25 | 20H1965-04 | 21.0 ppt |
| 2020-08-25 | 20H1968-01 | 27.0 ppt |
| 2020-08-25 | 20H1968-02 | ND |
| 2020-08-25 | 20H1968-03 | ND |
| 2020-08-25 | 20H1968-04 | 28.0 ppt |
| 2020-08-25 | 20H1977-01 | ND |
| 2020-08-25 | 20H1977-02 | ND |
| 2020-08-25 | 20H1977-03 | ND |
| 2020-08-25 | 20H1977-04 | ND |
| 2020-08-25 | 20H1981-01 | ND |
| 2020-08-25 | 20H1981-02 | ND |
| 2020-08-25 | 20H1981-03 | ND |
| 2020-08-25 | 20H1981-04 | ND |
| 2020-08-25 | 20H1985-01 | ND |
| 2020-08-25 | 20H1985-02 | 29.0 ppt |
| 2020-08-25 | 20H1985-03 | 36.0 ppt |
| 2020-08-25 | 20H1985-04 | ND |
| 2020-08-25 | 20H1988-01 | ND |
| 2020-08-25 | 20H1988-02 | ND |
| 2020-08-25 | 20H1988-03 | ND |
| 2020-08-25 | 20H1988-04 | ND |
| 2020-11-12 | 20K0569-01 | ND |
| 2020-11-12 | 20K0569-02 | ND |
| 2020-11-12 | 20K0569-03 | ND |
| 2020-11-12 | 20K0569-04 | ND |
| 2020-11-12 | 20K0571-01 | ND |
| 2020-11-12 | 20K0571-02 | ND |
| 2020-11-12 | 20K0571-03 | ND |
| 2020-11-12 | 20K0571-04 | ND |
| 2020-11-12 | 20K0573-01 | 19.0 ppt |
| 2020-11-12 | 20K0573-02 | 28.0 ppt |
| 2020-11-12 | 20K0573-03 | 28.0 ppt |
| 2020-11-12 | 20K0573-04 | ND |
| 2021-03-09 | 21C0454-01 | ND |
| 2021-03-09 | 21C0454-02 | ND |
| 2021-03-09 | 21C0454-03 | ND |
| 2021-03-09 | 21C0454-04 | ND |
| 2021-03-09 | 21C0456-01 | ND |
| 2021-03-09 | 21C0456-02 | ND |
| 2021-03-09 | 21C0456-03 | ND |
| 2021-03-09 | 21C0456-04 | 29.0 ppt |
| 2021-03-09 | 21C0457-01 | 16.0 ppt |
| 2021-03-09 | 21C0457-02 | ND |
| 2021-03-09 | 21C0457-03 | 30.0 ppt |
| 2021-03-09 | 21C0457-04 | ND |
| 2021-03-09 | 21C0460-01 | 2.90 ppt |
| 2021-04-27 | 21D1534-01 | ND |
| 2021-04-27 | 21D1534-02 | 24.0 ppt |
| 2021-04-27 | 21D1534-03 | ND |
| 2021-04-27 | 21D1534-04 | ND |
| 2021-04-27 | 21D1535-01 | ND |
| 2021-04-27 | 21D1535-02 | 31.0 ppt |
| 2021-04-27 | 21D1535-03 | ND |
| 2021-04-27 | 21D1535-04 | ND |
| 2021-04-27 | 21D1536-01 | ND |
| 2021-04-27 | 21D1536-02 | ND |
| 2021-04-27 | 21D1536-03 | ND |
| 2021-04-27 | 21D1536-04 | ND |
| 2021-04-27 | 21D1537-01 | ND |
| 2021-04-27 | 21D1537-02 | ND |
| 2021-04-27 | 21D1537-03 | ND |
| 2021-04-27 | 21D1538-01 | 18.0 ppt |
| 2021-04-27 | 21D1538-02 | 26.0 ppt |
| 2021-04-27 | 21D1538-03 | 26.0 ppt |
| 2021-04-27 | 21D1538-04 | ND |
| 2021-04-27 | 21D1539-01 | 3.20 ppt |
| 2021-04-27 | 21D1539-02 | ND |
| 2021-04-27 | 21D1540-01 | ND |
| 2021-04-27 | 21D1540-02 | ND |
| 2021-04-27 | 21D1540-03 | ND |
| 2021-04-27 | 21D1542-02 | ND |
| 2021-04-27 | 21D1542-03 | ND |
| 2021-04-27 | 21D1542-04 | ND |
| 2021-07-14 | 21G0701-01 | 4.70 ppt |
| 2021-07-14 | 21G0701-02 | 5.80 ppt |
| 2021-07-14 | 21G0701-03 | 2.50 ppt |
| 2021-07-14 | 21G0701-04 | 5.70 ppt |
| 2021-07-14 | 21G0701-05 | 2.50 ppt |
| 2021-07-14 | 21G0701-06 | 2.70 ppt |
| 2021-07-14 | 21G0701-07 | 2.30 ppt |
| 2021-07-14 | 21G0701-08 | ND |
| 2021-07-14 | 21G0702-01 | ND |
| 2021-07-14 | 21G0702-02 | ND |
| 2021-07-14 | 21G0702-03 | ND |
| 2021-07-14 | 21G0702-04 | ND |
| 2021-07-14 | 21G0704-01 | ND |
| 2021-07-14 | 21G0704-02 | ND |
| 2021-07-14 | 21G0704-03 | ND |
| 2021-07-14 | 21G0704-04 | ND |
| 2021-07-14 | 21G0705-01 | 16.0 ppt |
| 2021-07-14 | 21G0705-02 | 28.0 ppt |
| 2021-07-14 | 21G0705-03 | 28.0 ppt |
| 2021-07-14 | 21G0705-04 | ND |
| 2021-07-14 | 21G0705-05 | 25.0 ppt |
| 2021-07-14 | 21G0705-06 | ND |
| 2021-07-14 | 21G0705-07 | ND |
| 2021-07-14 | 21G0705-08 | ND |
| 2021-07-14 | 21G0705-09 | ND |
| 2021-07-14 | 21G0705-10 | ND |
| 2021-07-14 | 21G0705-11 | ND |
| 2021-07-15 | 21G0890-01 | 30.0 ppt |
| 2021-10-27 | 21J1484-01 | 14.0 ppt |
| 2021-10-27 | 21J1484-02 | 11.0 ppt |
| 2021-10-27 | 21J1484-03 | 2.40 ppt |
| 2021-10-27 | 21J1484-04 | 7.20 ppt |
| 2021-10-27 | 21J1484-05 | 3.00 ppt |
| 2021-10-27 | 21J1484-06 | 3.10 ppt |
| 2021-10-27 | 21J1484-07 | 2.50 ppt |
| 2021-10-27 | 21J1484-08 | ND |
| 2021-10-27 | 21J1487-01 | 17.0 ppt |
| 2021-10-27 | 21J1487-02 | 27.0 ppt |
| 2021-10-27 | 21J1487-03 | 26.0 ppt |
| 2021-10-27 | 21J1487-04 | ND |
| 2021-10-27 | 21J1487-05 | ND |
| 2021-10-27 | 21J1487-06 | ND |
| 2021-10-27 | 21J1487-07 | ND |
| 2021-10-27 | 21J1487-08 | ND |
| 2021-10-27 | 21J1487-09 | ND |
| 2021-10-27 | 21J1487-10 | ND |
| 2021-10-27 | 21J1487-11 | ND |
| 2021-12-15 | 21L0616-01 | ND |
| 2021-12-15 | 21L0616-02 | 12.0 ppt |
| 2021-12-15 | 21L0616-03 | 7.50 ppt |
| 2021-12-15 | 21L0616-04 | 5.90 ppt |
| 2022-02-01 | 22B0059-01 | 4.60 ppt |
| 2022-02-01 | 22B0059-02 | 10.00 ppt |
| 2022-02-01 | 22B0059-03 | 1.70 ppt |
| 2022-02-01 | 22B0059-04 | 6.40 ppt |
| 2022-02-01 | 22B0059-05 | 3.70 ppt |
| 2022-02-01 | 22B0059-06 | 2.40 ppt |
| 2022-02-01 | 22B0063-01 | 18.0 ppt |
| 2022-02-01 | 22B0063-02 | 26.0 ppt |
| 2022-02-01 | 22B0063-03 | 26.0 ppt |
| 2022-02-01 | 22B0063-04 | ND |
| 2022-02-01 | 22B0063-05 | ND |
| 2022-02-01 | 22B0063-06 | ND |
| 2022-02-01 | 22B0063-07 | ND |
| 2022-02-01 | 22B0063-08 | ND |
| 2022-02-01 | 22B0063-09 | ND |
| 2022-02-01 | 22B0063-10 | ND |
| 2022-02-01 | 22B0063-11 | ND |
| 2022-05-19 | 22E1650-01 | ND |
| 2022-05-19 | 22E1653-01 | ND |
| 2022-05-19 | 22E1653-02 | 28.0 ppt |
| 2022-05-19 | 22E1653-03 | 26.0 ppt |
| 2022-05-19 | 22E1653-04 | ND |
| 2022-05-19 | 22E1653-05 | ND |
| 2022-05-19 | 22E1653-06 | ND |
| 2022-05-19 | 22E1653-07 | ND |
| 2022-05-19 | 22E1653-08 | ND |
| 2022-05-19 | 22E1653-09 | ND |
| 2022-05-19 | 22E1653-10 | ND |
| 2022-05-19 | 22E1653-11 | ND |
| 2022-05-19 | 22E1653-12 | ND |
| 2022-05-19 | 22E1659-01 | 2.10 ppt |
| 2022-05-19 | 22E1659-02 | 6.90 ppt |
| 2022-05-19 | 22E1659-03 | 3.00 ppt |
| 2022-05-19 | 22E1659-04 | 3.00 ppt |
| 2022-06-02 | 22F0133-01 | 4.60 ppt |
| 2022-06-02 | 22F0133-02 | 3.20 ppt |
| 2022-09-21 | 22I1871-01 | 1.90 ppt |
| 2022-09-21 | 22I1871-02 | 2.90 ppt |
| 2022-09-21 | 22I1871-03 | 1.30 ppt |
| 2022-09-21 | 22I1871-04 | 7.90 ppt |
| 2022-09-21 | 22I1871-05 | 3.20 ppt |
| 2022-09-21 | 22I1871-06 | 4.00 ppt |
| 2022-09-21 | 22I1871-07 | 0.380 ppt |
| 2022-09-21 | 22I1871-08 | 0.620 ppt |
| 2022-09-21 | 22I1871-09 | ND |
| 2022-09-21 | 22I1872-01 | ND |
| 2022-09-21 | 22I1872-02 | ND |
| 2022-09-21 | 22I1872-03 | ND |
| 2022-09-21 | 22I1872-05 | 26.0 ppt |
| 2022-09-21 | 22I1872-06 | 28.0 ppt |
| 2022-09-21 | 22I1873-01 | ND |
| 2022-09-21 | 22I1873-02 | 15.0 ppt |
| 2022-09-21 | 22I1873-03 | ND |
| 2022-09-21 | 22I1873-04 | 26.0 ppt |
| 2022-09-21 | 22I1873-05 | 27.0 ppt |
| 2022-09-21 | 22I1873-06 | ND |
| 2022-09-21 | 22I1873-07 | ND |
| 2022-09-21 | 22I1873-08 | ND |
| 2022-09-21 | 22I1873-09 | ND |
| 2022-09-21 | 22I1873-10 | ND |
| 2022-09-21 | 22I1873-11 | ND |
| 2022-09-21 | 22I1873-12 | ND |
| 2022-12-15 | 22L0869-01 | 1.60 ppt |
| 2022-12-15 | 22L0869-02 | 2.50 ppt |
| 2022-12-15 | 22L0869-03 | 7.50 ppt |
| 2022-12-15 | 22L0869-04 | 3.20 ppt |
| 2022-12-15 | 22L0869-05 | 3.40 ppt |
| 2022-12-15 | 22L0869-06 | ND |
| 2022-12-15 | 22L0869-07 | 0.660 ppt |
| 2022-12-15 | 22L0869-08 | ND |
| 2022-12-15 | 22L0869-09 | 2.40 ppt |
| 2022-12-15 | 22L0870-01 | ND |
| 2022-12-15 | 22L0870-02 | ND |
| 2022-12-15 | 22L0870-03 | ND |
| 2022-12-15 | 22L0872-01 | ND |
| 2022-12-15 | 22L0872-02 | 16.0 ppt |
| 2022-12-15 | 22L0872-03 | 27.0 ppt |
| 2022-12-15 | 22L0872-04 | 28.0 ppt |
| 2022-12-15 | 22L0872-05 | ND |
| 2022-12-15 | 22L0872-06 | ND |
| 2022-12-15 | 22L0872-07 | ND |
| 2022-12-15 | 22L0872-08 | ND |
| 2022-12-15 | 22L0872-09 | ND |
| 2022-12-15 | 22L0872-10 | ND |
| 2022-12-15 | 22L0872-11 | ND |
| 2023-03-13 | 23C0641-01 | ND |
| 2023-03-13 | 23C0641-02 | 16.0 ppt |
| 2023-03-13 | 23C0641-03 | ND |
| 2023-03-13 | 23C0641-04 | 31.0 ppt |
| 2023-03-13 | 23C0641-05 | 32.0 ppt |
| 2023-03-13 | 23C0641-06 | ND |
| 2023-03-13 | 23C0641-07 | ND |
| 2023-03-13 | 23C0641-08 | ND |
| 2023-03-13 | 23C0641-09 | ND |
| 2023-03-13 | 23C0641-10 | ND |
| 2023-03-13 | 23C0641-11 | ND |
| 2023-03-13 | 23C0641-12 | ND |
| 2023-03-13 | 23C0642-01 | ND |
| 2023-03-13 | 23C0642-02 | ND |
| 2023-03-13 | 23C0642-03 | ND |
| 2023-03-13 | 32300824-1 | ND |
| 2023-03-13 | 32300824-3 | 8.37 ppt |
| 2023-03-14 | 32300824-5 | ND |
| 2023-03-14 | 32300824-7 | ND |
| 2023-03-14 | 32300824-9 | ND |
| 2023-06-07 | 23F0523-01 | 1.80 ppt |
| 2023-06-07 | 23F0523-02 | 2.00 ppt |
| 2023-06-07 | 23F0523-03 | 0.780 ppt |
| 2023-06-07 | 23F0523-04 | 4.90 ppt |
| 2023-06-07 | 23F0523-05 | 3.00 ppt |
| 2023-06-07 | 23F0523-06 | 2.90 ppt |
| 2023-06-07 | 23F0523-07 | 0.350 ppt |
| 2023-06-07 | 23F0523-08 | 0.600 ppt |
| 2023-06-07 | 23F0523-09 | ND |
| 2023-06-07 | 23F0523-10 | 2.30 ppt |
| 2023-06-07 | 23F0523-11 | ND |
| 2023-06-07 | 23F0523-13 | ND |
| 2023-06-07 | 23F0525-01 | ND |
| 2023-06-07 | 23F0525-02 | 19.0 ppt |
| 2023-06-07 | 23F0525-03 | ND |
| 2023-06-07 | 23F0525-04 | 29.0 ppt |
| 2023-06-07 | 23F0525-05 | 30.0 ppt |
| 2023-06-07 | 23F0525-06 | ND |
| 2023-06-07 | 23F0525-07 | ND |
| 2023-06-07 | 23F0525-08 | ND |
| 2023-06-07 | 23F0525-09 | ND |
| 2023-06-07 | 23F0525-10 | ND |
| 2023-06-07 | 23F0525-11 | ND |
| 2023-06-07 | 23F0525-12 | ND |
| 2023-06-07 | 23F0527-01 | ND |
| 2023-06-07 | 23F0527-02 | ND |
| 2023-09-07 | 32303085-3 | ND |
| 2023-09-07 | 32303085-7 | 3.69 ppt |
| 2023-09-07 | 32303085-9 | ND |
| 2023-09-19 | 23I1034-01 | ND |
| 2023-09-19 | 23I1034-02 | ND |
| 2023-09-19 | 23I1034-03 | ND |
| 2023-09-19 | 23I1034-04 | 25.0 ppt |
| 2023-09-19 | 23I1034-05 | 31.0 ppt |
| 2023-09-19 | 23I1034-06 | ND |
| 2023-09-19 | 23I1034-07 | ND |
| 2023-09-19 | 23I1034-08 | ND |
| 2023-09-19 | 23I1034-09 | ND |
| 2023-09-19 | 23I1034-10 | ND |
| 2023-09-19 | 23I1034-11 | ND |
| 2023-09-19 | 23I1034-12 | ND |
| 2023-09-19 | 23I1035-01 | ND |
| 2023-09-19 | 23I1036-01 | ND |
| 2023-09-19 | 23I1036-02 | ND |
| 2023-09-19 | 32303085-1 | ND |
| 2023-09-19 | 32303085-5 | ND |
| 2023-12-20 | 23L0782-01 | 2.30 ppt |
| 2023-12-20 | 23L0782-02 | 2.20 ppt |
| 2023-12-20 | 23L0782-03 | 0.850 ppt |
| 2023-12-20 | 23L0782-04 | 3.30 ppt |
| 2023-12-20 | 23L0782-05 | 2.80 ppt |
| 2023-12-20 | 23L0782-06 | 0.490 ppt |
| 2023-12-20 | 23L0782-07 | 0.620 ppt |
| 2023-12-20 | 23L0782-08 | 0.370 ppt |
| 2023-12-20 | 23L0782-09 | 3.00 ppt |
| 2023-12-20 | 23L0782-10 | ND |
| 2023-12-20 | 23L0782-11 | ND |
| 2023-12-20 | 23L0784-01 | ND |
| 2023-12-20 | 23L0784-02 | 21.0 ppt |
| 2023-12-20 | 23L0784-03 | 16.0 ppt |
| 2023-12-20 | 23L0784-04 | 28.0 ppt |
| 2023-12-20 | 23L0784-05 | 33.0 ppt |
| 2023-12-20 | 23L0784-06 | ND |
| 2023-12-20 | 23L0784-07 | ND |
| 2023-12-20 | 23L0784-08 | ND |
| 2023-12-20 | 23L0784-09 | ND |
| 2023-12-20 | 23L0784-10 | ND |
| 2023-12-20 | 23L0784-11 | ND |
| 2023-12-20 | 23L0784-12 | ND |
| 2023-12-20 | 23L0784-13 | ND |
| 2023-12-20 | 23L0784-14 | ND |