Perfluorooctane sulfonate (PFOS)
Devens Massdevelopment
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 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 | 9.14 ppt | 7 | 7 | 3.46 ppt - 39.0 ppt |
| 2019 | 1.02 ppt | 30 | 8 | ND - 5.80 ppt |
| 2020 | 1.58 ppt | 1 | 1 | 1.58 ppt |
| 2021 | 2.72 ppt | 199 | 81 | ND - 38.9 ppt |
| 2022 | 0.817 ppt | 171 | 22 | ND - 33.0 ppt |
| 2023 | 0.684 ppt | 129 | 12 | ND - 37.0 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 | Result |
|---|---|
| 2018-02-27 | 39.0 ppt |
| 2018-05-14 | 4.80 ppt |
| 2018-05-14 | 5.70 ppt |
| 2018-08-03 | 3.46 ppt |
| 2018-08-03 | 3.70 ppt |
| 2018-10-25 | 3.56 ppt |
| 2018-10-25 | 3.77 ppt |
| 2019-02-20 | 4.60 ppt |
| 2019-02-20 | 5.80 ppt |
| 2019-05-21 | 3.33 ppt |
| 2019-05-21 | 5.43 ppt |
| 2019-08-02 | ND |
| 2019-08-20 | 3.06 ppt |
| 2019-08-20 | ND |
| 2019-09-03 | ND |
| 2019-09-03 | ND |
| 2019-09-18 | ND |
| 2019-09-18 | ND |
| 2019-09-25 | ND |
| 2019-10-02 | ND |
| 2019-10-02 | 2.09 ppt |
| 2019-10-09 | ND |
| 2019-10-15 | ND |
| 2019-10-15 | ND |
| 2019-10-23 | ND |
| 2019-10-30 | ND |
| 2019-10-30 | 2.42 ppt |
| 2019-11-06 | ND |
| 2019-11-13 | ND |
| 2019-11-13 | ND |
| 2019-11-20 | ND |
| 2019-11-25 | ND |
| 2019-11-25 | ND |
| 2019-12-04 | ND |
| 2019-12-18 | ND |
| 2019-12-23 | 3.76 ppt |
| 2019-12-23 | ND |
| 2020-07-14 | 1.58 ppt |
| 2021-01-06 | ND |
| 2021-01-06 | ND |
| 2021-01-06 | 0.940 ppt |
| 2021-01-06 | 8.00 ppt |
| 2021-01-06 | 3.90 ppt |
| 2021-01-06 | ND |
| 2021-01-06 | 35.8 ppt |
| 2021-01-06 | 1.50 ppt |
| 2021-01-06 | ND |
| 2021-01-06 | 4.60 ppt |
| 2021-01-06 | ND |
| 2021-01-06 | ND |
| 2021-01-06 | ND |
| 2021-01-06 | 4.40 ppt |
| 2021-01-13 | 2.20 ppt |
| 2021-01-13 | ND |
| 2021-01-13 | ND |
| 2021-01-13 | ND |
| 2021-01-13 | ND |
| 2021-01-13 | 1.60 ppt |
| 2021-01-13 | 4.90 ppt |
| 2021-02-03 | 2.79 ppt |
| 2021-02-03 | ND |
| 2021-02-03 | ND |
| 2021-02-03 | 0.926 ppt |
| 2021-02-03 | ND |
| 2021-02-03 | ND |
| 2021-02-03 | ND |
| 2021-02-03 | ND |
| 2021-02-03 | ND |
| 2021-02-03 | 38.9 ppt |
| 2021-02-03 | ND |
| 2021-02-17 | ND |
| 2021-02-17 | ND |
| 2021-02-17 | 37.8 ppt |
| 2021-02-24 | ND |
| 2021-02-24 | 6.15 ppt |
| 2021-02-24 | ND |
| 2021-02-24 | ND |
| 2021-02-24 | ND |
| 2021-02-24 | ND |
| 2021-02-24 | 1.94 ppt |
| 2021-03-02 | ND |
| 2021-03-02 | ND |
| 2021-03-02 | 34.5 ppt |
| 2021-03-02 | 1.20 ppt |
| 2021-03-02 | ND |
| 2021-03-02 | ND |
| 2021-03-02 | ND |
| 2021-03-02 | ND |
| 2021-03-02 | ND |
| 2021-03-10 | ND |
| 2021-03-10 | 6.98 ppt |
| 2021-03-10 | ND |
| 2021-03-10 | ND |
| 2021-03-10 | ND |
| 2021-03-10 | ND |
| 2021-03-10 | ND |
| 2021-03-17 | 32.4 ppt |
| 2021-03-17 | ND |
| 2021-03-17 | 0.888 ppt |
| 2021-03-24 | ND |
| 2021-03-24 | ND |
| 2021-03-24 | ND |
| 2021-03-24 | 5.94 ppt |
| 2021-03-24 | ND |
| 2021-03-24 | ND |
| 2021-03-24 | 1.43 ppt |
| 2021-03-31 | 29.7 ppt |
| 2021-03-31 | ND |
| 2021-03-31 | 1.55 ppt |
| 2021-03-31 | ND |
| 2021-03-31 | ND |
| 2021-04-08 | ND |
| 2021-04-08 | ND |
| 2021-04-08 | ND |
| 2021-04-08 | ND |
| 2021-04-19 | ND |
| 2021-06-02 | 0.949 ppt |
| 2021-06-02 | ND |
| 2021-06-02 | 1.33 ppt |
| 2021-06-02 | ND |
| 2021-06-02 | ND |
| 2021-06-02 | 0.607 ppt |
| 2021-06-02 | 5.74 ppt |
| 2021-06-09 | ND |
| 2021-06-09 | ND |
| 2021-06-09 | ND |
| 2021-06-16 | 4.97 ppt |
| 2021-06-16 | 0.916 ppt |
| 2021-06-16 | ND |
| 2021-06-16 | ND |
| 2021-06-16 | ND |
| 2021-06-16 | 0.743 ppt |
| 2021-06-16 | 0.593 ppt |
| 2021-06-23 | 1.63 ppt |
| 2021-06-23 | ND |
| 2021-06-23 | 1.92 ppt |
| 2021-06-23 | ND |
| 2021-06-23 | 31.0 ppt |
| 2021-07-07 | ND |
| 2021-07-07 | ND |
| 2021-07-07 | ND |
| 2021-07-07 | ND |
| 2021-07-07 | 1.54 ppt |
| 2021-07-07 | 2.79 ppt |
| 2021-07-07 | 3.78 ppt |
| 2021-07-07 | ND |
| 2021-07-07 | 38.8 ppt |
| 2021-07-07 | 1.47 ppt |
| 2021-07-07 | ND |
| 2021-07-07 | 3.58 ppt |
| 2021-07-07 | ND |
| 2021-07-07 | 2.14 ppt |
| 2021-07-14 | ND |
| 2021-07-14 | 6.05 ppt |
| 2021-07-14 | 0.870 ppt |
| 2021-07-14 | ND |
| 2021-07-14 | ND |
| 2021-07-14 | ND |
| 2021-07-21 | 35.6 ppt |
| 2021-07-21 | ND |
| 2021-07-21 | ND |
| 2021-07-21 | ND |
| 2021-07-21 | 3.85 ppt |
| 2021-07-28 | 1.11 ppt |
| 2021-07-28 | 0.562 ppt |
| 2021-07-28 | ND |
| 2021-07-28 | ND |
| 2021-07-28 | 5.39 ppt |
| 2021-07-28 | ND |
| 2021-07-28 | ND |
| 2021-07-28 | 1.91 ppt |
| 2021-08-05 | ND |
| 2021-08-05 | ND |
| 2021-08-05 | ND |
| 2021-08-05 | ND |
| 2021-08-11 | 1.31 ppt |
| 2021-08-11 | ND |
| 2021-08-11 | ND |
| 2021-08-11 | 0.892 ppt |
| 2021-08-11 | 4.44 ppt |
| 2021-08-11 | ND |
| 2021-08-11 | 1.23 ppt |
| 2021-08-11 | 4.44 ppt |
| 2021-08-18 | ND |
| 2021-08-18 | 0.738 ppt |
| 2021-08-18 | 1.42 ppt |
| 2021-08-18 | 32.5 ppt |
| 2021-08-18 | 0.532 ppt |
| 2021-08-25 | 1.09 ppt |
| 2021-08-25 | ND |
| 2021-08-25 | 1.53 ppt |
| 2021-08-25 | 1.94 ppt |
| 2021-08-25 | 5.05 ppt |
| 2021-08-25 | ND |
| 2021-08-25 | ND |
| 2021-09-08 | 2.14 ppt |
| 2021-09-08 | ND |
| 2021-09-08 | ND |
| 2021-09-08 | ND |
| 2021-09-08 | 1.89 ppt |
| 2021-09-08 | ND |
| 2021-09-08 | 5.56 ppt |
| 2021-10-06 | ND |
| 2021-10-06 | 4.05 ppt |
| 2021-10-06 | ND |
| 2021-10-06 | 2.24 ppt |
| 2021-10-06 | ND |
| 2021-10-06 | ND |
| 2021-10-06 | 1.51 ppt |
| 2021-10-06 | ND |
| 2021-10-06 | 1.36 ppt |
| 2021-10-06 | 1.91 ppt |
| 2021-10-06 | 4.93 ppt |
| 2021-10-06 | 2.77 ppt |
| 2021-10-06 | ND |
| 2021-10-06 | 1.54 ppt |
| 2021-10-06 | 2.00 ppt |
| 2021-10-06 | 1.73 ppt |
| 2021-10-06 | ND |
| 2021-10-06 | ND |
| 2021-10-06 | 1.21 ppt |
| 2021-10-06 | 11.2 ppt |
| 2021-12-02 | ND |
| 2021-12-02 | ND |
| 2021-12-02 | 4.61 ppt |
| 2021-12-02 | ND |
| 2021-12-02 | ND |
| 2021-12-02 | ND |
| 2021-12-02 | ND |
| 2021-12-08 | 1.92 ppt |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2021-12-08 | ND |
| 2022-01-05 | 0.781 ppt |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | 30.2 ppt |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-01-12 | ND |
| 2022-01-12 | 3.20 ppt |
| 2022-01-12 | ND |
| 2022-01-12 | ND |
| 2022-01-12 | ND |
| 2022-01-12 | ND |
| 2022-01-12 | 0.934 ppt |
| 2022-01-12 | ND |
| 2022-02-02 | ND |
| 2022-02-02 | 0.753 ppt |
| 2022-02-02 | 0.924 ppt |
| 2022-02-02 | ND |
| 2022-02-02 | ND |
| 2022-02-02 | ND |
| 2022-02-02 | ND |
| 2022-02-02 | ND |
| 2022-02-09 | 0.837 ppt |
| 2022-02-09 | ND |
| 2022-02-09 | 1.79 ppt |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-02-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-09 | ND |
| 2022-03-16 | ND |
| 2022-03-16 | ND |
| 2022-03-16 | ND |
| 2022-03-16 | ND |
| 2022-03-16 | ND |
| 2022-03-16 | ND |
| 2022-03-16 | ND |
| 2022-04-13 | ND |
| 2022-04-13 | 2.50 ppt |
| 2022-04-13 | ND |
| 2022-04-13 | 1.20 ppt |
| 2022-04-13 | ND |
| 2022-04-13 | ND |
| 2022-04-13 | ND |
| 2022-04-13 | ND |
| 2022-04-19 | ND |
| 2022-04-19 | ND |
| 2022-04-19 | ND |
| 2022-04-19 | ND |
| 2022-04-19 | ND |
| 2022-04-19 | ND |
| 2022-04-19 | 16.0 ppt |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-04 | ND |
| 2022-05-16 | ND |
| 2022-05-16 | 17.0 ppt |
| 2022-05-16 | ND |
| 2022-05-16 | ND |
| 2022-05-16 | ND |
| 2022-05-16 | ND |
| 2022-05-16 | ND |
| 2022-05-27 | 33.0 ppt |
| 2022-05-27 | ND |
| 2022-06-08 | ND |
| 2022-06-08 | 1.50 ppt |
| 2022-06-08 | ND |
| 2022-06-08 | ND |
| 2022-06-08 | ND |
| 2022-06-08 | ND |
| 2022-06-08 | ND |
| 2022-06-08 | ND |
| 2022-06-14 | ND |
| 2022-06-14 | ND |
| 2022-06-14 | ND |
| 2022-06-14 | ND |
| 2022-06-14 | ND |
| 2022-06-14 | ND |
| 2022-06-14 | 3.90 ppt |
| 2022-07-13 | ND |
| 2022-07-13 | 1.30 ppt |
| 2022-07-13 | ND |
| 2022-07-13 | ND |
| 2022-07-13 | ND |
| 2022-07-20 | ND |
| 2022-07-20 | ND |
| 2022-07-20 | ND |
| 2022-07-20 | ND |
| 2022-07-20 | ND |
| 2022-07-20 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-03 | ND |
| 2022-08-18 | ND |
| 2022-08-18 | ND |
| 2022-08-18 | ND |
| 2022-08-18 | 10.00 ppt |
| 2022-08-18 | ND |
| 2022-08-18 | ND |
| 2022-08-18 | ND |
| 2022-09-01 | ND |
| 2022-09-01 | ND |
| 2022-09-07 | ND |
| 2022-09-07 | ND |
| 2022-09-07 | ND |
| 2022-09-07 | ND |
| 2022-09-07 | ND |
| 2022-09-07 | ND |
| 2022-09-07 | ND |
| 2022-09-14 | ND |
| 2022-09-14 | ND |
| 2022-09-14 | ND |
| 2022-09-14 | ND |
| 2022-09-14 | ND |
| 2022-09-14 | ND |
| 2022-10-05 | 0.890 ppt |
| 2022-10-05 | ND |
| 2022-10-05 | ND |
| 2022-10-05 | ND |
| 2022-10-12 | ND |
| 2022-10-12 | 4.30 ppt |
| 2022-10-12 | ND |
| 2022-10-12 | ND |
| 2022-10-12 | ND |
| 2022-10-12 | ND |
| 2022-10-12 | ND |
| 2022-11-02 | ND |
| 2022-11-02 | ND |
| 2022-11-02 | ND |
| 2022-11-02 | ND |
| 2022-11-02 | 1.20 ppt |
| 2022-11-02 | ND |
| 2022-11-10 | ND |
| 2022-11-10 | ND |
| 2022-11-10 | ND |
| 2022-11-10 | ND |
| 2022-11-10 | 6.90 ppt |
| 2022-11-10 | ND |
| 2022-11-10 | ND |
| 2022-12-07 | 0.610 ppt |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2022-12-07 | ND |
| 2023-01-11 | ND |
| 2023-01-11 | 37.0 ppt |
| 2023-01-11 | ND |
| 2023-01-18 | ND |
| 2023-01-18 | ND |
| 2023-01-18 | ND |
| 2023-01-18 | ND |
| 2023-01-18 | 4.30 ppt |
| 2023-01-18 | ND |
| 2023-01-18 | ND |
| 2023-01-18 | ND |
| 2023-02-03 | ND |
| 2023-02-03 | ND |
| 2023-02-14 | ND |
| 2023-02-14 | ND |
| 2023-02-14 | ND |
| 2023-02-14 | ND |
| 2023-02-14 | ND |
| 2023-02-14 | ND |
| 2023-02-14 | ND |
| 2023-02-24 | ND |
| 2023-02-24 | ND |
| 2023-02-24 | 10.00 ppt |
| 2023-02-24 | ND |
| 2023-02-24 | 1.50 ppt |
| 2023-03-01 | ND |
| 2023-03-01 | ND |
| 2023-03-01 | 0.650 ppt |
| 2023-03-01 | ND |
| 2023-03-01 | ND |
| 2023-03-01 | ND |
| 2023-03-08 | ND |
| 2023-03-08 | ND |
| 2023-03-08 | ND |
| 2023-03-08 | ND |
| 2023-03-08 | ND |
| 2023-03-08 | ND |
| 2023-03-08 | ND |
| 2023-04-04 | ND |
| 2023-04-04 | ND |
| 2023-04-04 | ND |
| 2023-04-06 | ND |
| 2023-04-06 | ND |
| 2023-04-06 | ND |
| 2023-04-06 | ND |
| 2023-04-06 | ND |
| 2023-04-06 | ND |
| 2023-04-06 | ND |
| 2023-04-19 | 1.26 ppt |
| 2023-04-19 | ND |
| 2023-04-19 | ND |
| 2023-04-19 | ND |
| 2023-04-19 | ND |
| 2023-04-19 | ND |
| 2023-04-28 | ND |
| 2023-04-28 | ND |
| 2023-04-28 | 27.3 ppt |
| 2023-05-03 | ND |
| 2023-05-03 | 1.15 ppt |
| 2023-05-03 | ND |
| 2023-05-12 | ND |
| 2023-05-26 | ND |
| 2023-06-07 | ND |
| 2023-06-07 | ND |
| 2023-06-07 | 1.60 ppt |
| 2023-06-07 | ND |
| 2023-06-09 | ND |
| 2023-06-23 | ND |
| 2023-07-07 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | 1.35 ppt |
| 2023-07-11 | ND |
| 2023-07-18 | ND |
| 2023-07-21 | ND |
| 2023-08-04 | ND |
| 2023-08-08 | ND |
| 2023-08-08 | ND |
| 2023-08-08 | ND |
| 2023-08-08 | 1.23 ppt |
| 2023-08-08 | ND |
| 2023-08-18 | ND |
| 2023-09-01 | ND |
| 2023-09-01 | ND |
| 2023-09-19 | ND |
| 2023-09-19 | ND |
| 2023-09-19 | ND |
| 2023-09-19 | ND |
| 2023-09-19 | ND |
| 2023-09-19 | ND |
| 2023-09-29 | ND |
| 2023-09-29 | ND |
| 2023-10-04 | ND |
| 2023-10-04 | ND |
| 2023-10-05 | ND |
| 2023-10-05 | ND |
| 2023-10-13 | ND |
| 2023-10-19 | ND |
| 2023-10-19 | ND |
| 2023-10-19 | ND |
| 2023-10-19 | ND |
| 2023-10-27 | ND |
| 2023-10-27 | ND |
| 2023-11-07 | ND |
| 2023-11-07 | ND |
| 2023-11-07 | 0.890 ppt |
| 2023-11-07 | ND |
| 2023-11-09 | ND |
| 2023-11-09 | ND |
| 2023-11-09 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-11-29 | ND |
| 2023-12-08 | ND |
| 2023-12-14 | ND |
| 2023-12-14 | ND |
| 2023-12-14 | ND |
| 2023-12-14 | ND |
| 2023-12-14 | ND |
| 2023-12-14 | ND |
| 2023-12-14 | ND |
| 2023-12-22 | ND |
| 2023-12-22 | ND |