Perfluorohexane sulfonate (PFHXS)
Littleton Water Department
Perfluorohexane sulfonate is a member of a group of perfluorinated chemicals used in many consumer products. 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 | N/A | 0 | 0 | N/A |
| 2019 | 1.00 ppt | 7 | 3 | ND - 3.21 ppt |
| 2020 | 1.34 ppt | 18 | 18 | 0.521 ppt - 2.50 ppt |
| 2021 | 1.48 ppt | 38 | 37 | ND - 2.72 ppt |
| 2022 | 1.22 ppt | 51 | 40 | ND - 3.75 ppt |
| 2023 | 1.02 ppt | 37 | 28 | ND - 3.11 ppt |
| 2024 | ND | 1 | 0 | ND |
ppt = parts per trillion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.001 ppt
The EWG Health Guideline of 0.001 ppt for perfluorohexane sulfonate was defined by EPA's toxicity value published in the Integrated Risk Information System's toxicological review. This health guideline harm to the developing immune system.
EPA Maximum Contaminant
Level (MCL): 10 ppt
ppt = parts per trillion
All test results
| Date | Result |
|---|---|
| 2019-06-19 | ND |
| 2019-08-06 | ND |
| 2019-08-06 | 3.21 ppt |
| 2019-08-06 | ND |
| 2019-08-06 | ND |
| 2019-09-23 | 3.09 ppt |
| 2019-12-09 | 0.720 ppt |
| 2020-07-28 | 0.700 ppt |
| 2020-07-28 | 2.50 ppt |
| 2020-07-28 | 1.60 ppt |
| 2020-10-15 | 0.645 ppt |
| 2020-10-15 | 1.99 ppt |
| 2020-10-15 | 0.693 ppt |
| 2020-10-15 | 0.780 ppt |
| 2020-10-15 | 0.790 ppt |
| 2020-10-15 | 0.521 ppt |
| 2020-10-15 | 2.28 ppt |
| 2020-10-15 | 0.685 ppt |
| 2020-11-04 | 1.64 ppt |
| 2020-11-04 | 1.64 ppt |
| 2020-11-04 | 0.644 ppt |
| 2020-11-04 | 2.23 ppt |
| 2020-12-02 | 2.50 ppt |
| 2020-12-02 | 1.58 ppt |
| 2020-12-02 | 0.774 ppt |
| 2021-01-12 | 2.10 ppt |
| 2021-01-12 | 0.745 ppt |
| 2021-01-12 | 1.90 ppt |
| 2021-02-08 | 2.16 ppt |
| 2021-02-08 | 0.816 ppt |
| 2021-02-08 | 1.25 ppt |
| 2021-03-17 | 2.63 ppt |
| 2021-03-17 | 1.64 ppt |
| 2021-03-17 | 1.64 ppt |
| 2021-03-17 | 1.09 ppt |
| 2021-03-17 | 1.09 ppt |
| 2021-04-05 | 1.57 ppt |
| 2021-04-05 | 2.72 ppt |
| 2021-04-05 | 0.981 ppt |
| 2021-05-12 | 2.29 ppt |
| 2021-05-12 | 0.817 ppt |
| 2021-05-12 | 1.56 ppt |
| 2021-06-08 | 1.73 ppt |
| 2021-06-08 | 0.963 ppt |
| 2021-06-08 | 2.30 ppt |
| 2021-07-21 | 1.47 ppt |
| 2021-07-21 | 0.840 ppt |
| 2021-07-21 | 2.27 ppt |
| 2021-09-08 | 1.78 ppt |
| 2021-09-08 | 0.781 ppt |
| 2021-09-08 | 2.62 ppt |
| 2021-10-06 | 2.54 ppt |
| 2021-10-06 | 1.62 ppt |
| 2021-10-06 | 0.758 ppt |
| 2021-10-13 | 1.18 ppt |
| 2021-10-21 | 0.689 ppt |
| 2021-10-28 | 0.852 ppt |
| 2021-11-15 | 1.23 ppt |
| 2021-11-15 | 0.798 ppt |
| 2021-11-15 | 2.13 ppt |
| 2021-12-14 | ND |
| 2021-12-14 | 1.49 ppt |
| 2021-12-14 | 0.997 ppt |
| 2022-01-11 | 1.12 ppt |
| 2022-01-11 | 1.56 ppt |
| 2022-01-11 | ND |
| 2022-01-18 | ND |
| 2022-02-16 | ND |
| 2022-02-16 | 1.85 ppt |
| 2022-02-16 | 1.27 ppt |
| 2022-03-16 | 1.14 ppt |
| 2022-03-16 | 1.56 ppt |
| 2022-03-16 | ND |
| 2022-04-20 | 1.79 ppt |
| 2022-04-20 | 1.73 ppt |
| 2022-04-25 | ND |
| 2022-04-27 | 0.838 ppt |
| 2022-05-16 | 1.67 ppt |
| 2022-05-16 | 1.31 ppt |
| 2022-05-18 | ND |
| 2022-05-18 | 0.672 ppt |
| 2022-05-18 | 0.828 ppt |
| 2022-06-22 | 1.29 ppt |
| 2022-06-22 | 0.816 ppt |
| 2022-06-22 | 1.29 ppt |
| 2022-06-22 | 0.666 ppt |
| 2022-07-13 | ND |
| 2022-07-13 | ND |
| 2022-07-13 | 1.33 ppt |
| 2022-07-13 | 1.60 ppt |
| 2022-07-13 | ND |
| 2022-07-13 | 0.701 ppt |
| 2022-08-03 | ND |
| 2022-08-03 | 0.687 ppt |
| 2022-08-03 | 1.97 ppt |
| 2022-08-03 | 1.39 ppt |
| 2022-09-26 | 3.71 ppt |
| 2022-09-26 | 2.73 ppt |
| 2022-09-27 | ND |
| 2022-09-27 | 0.775 ppt |
| 2022-10-19 | 3.75 ppt |
| 2022-10-19 | 0.860 ppt |
| 2022-10-19 | 2.27 ppt |
| 2022-10-27 | 0.675 ppt |
| 2022-10-27 | 0.827 ppt |
| 2022-10-27 | 0.638 ppt |
| 2022-11-07 | 3.23 ppt |
| 2022-11-07 | 2.18 ppt |
| 2022-11-09 | 1.39 ppt |
| 2022-11-09 | 1.52 ppt |
| 2022-12-20 | 1.24 ppt |
| 2022-12-20 | 2.31 ppt |
| 2022-12-20 | 3.75 ppt |
| 2022-12-20 | 1.11 ppt |
| 2023-01-03 | 3.05 ppt |
| 2023-01-03 | 1.83 ppt |
| 2023-01-24 | ND |
| 2023-01-24 | 0.790 ppt |
| 2023-01-24 | ND |
| 2023-01-24 | ND |
| 2023-02-01 | ND |
| 2023-02-01 | 1.88 ppt |
| 2023-03-07 | 0.859 ppt |
| 2023-03-07 | 0.624 ppt |
| 2023-04-18 | 0.636 ppt |
| 2023-04-18 | ND |
| 2023-04-18 | 0.795 ppt |
| 2023-04-18 | 0.798 ppt |
| 2023-05-17 | 1.60 ppt |
| 2023-05-17 | 2.34 ppt |
| 2023-05-17 | 0.769 ppt |
| 2023-06-16 | 1.57 ppt |
| 2023-06-16 | 0.825 ppt |
| 2023-07-25 | ND |
| 2023-07-25 | ND |
| 2023-07-25 | 3.11 ppt |
| 2023-07-25 | ND |
| 2023-07-25 | 0.970 ppt |
| 2023-07-25 | 0.743 ppt |
| 2023-08-21 | 1.72 ppt |
| 2023-08-21 | 0.726 ppt |
| 2023-09-19 | 1.69 ppt |
| 2023-09-19 | 1.52 ppt |
| 2023-10-03 | 0.713 ppt |
| 2023-10-03 | 1.52 ppt |
| 2023-10-03 | 2.16 ppt |
| 2023-10-12 | 1.39 ppt |
| 2023-11-28 | 1.26 ppt |
| 2023-11-28 | 1.21 ppt |
| 2023-11-28 | 0.653 ppt |
| 2023-12-19 | ND |
| 2024-07-17 | ND |