Hexafluoropropylene oxide dimer acid (HFPO-DA)
Northampton Water Department
Hexafluoropropylene oxide dimer acid (HFPO-DA) is a member of a group of perfluorinated chemicals used in many consumer products. HFPO-DA 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 10 | 0 | ND |
| 2022 | ND | 6 | 0 | ND |
| 2023 | ND | 8 | 0 | ND |
| 2024 | ND | 4 | 0 | ND |
ppt = parts per trillion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 9 ppt
The EWG Health Guideline of 9 ppt for HFPO-DA was based on the EPA's Human Health toxicity value.This health guideline protects against harm to the liver.
EPA Maximum Contaminant
Level (MCL): 10 ppt
ppt = parts per trillion
All test results
| Date | Result |
|---|---|
| 2021-04-07 | ND |
| 2021-04-07 | ND |
| 2021-04-07 | ND |
| 2021-06-03 | ND |
| 2021-07-14 | ND |
| 2021-07-14 | ND |
| 2021-07-14 | ND |
| 2021-10-07 | ND |
| 2021-10-07 | ND |
| 2021-10-07 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-01-05 | ND |
| 2022-04-04 | ND |
| 2022-04-04 | ND |
| 2022-04-04 | ND |
| 2023-04-03 | ND |
| 2023-04-03 | ND |
| 2023-04-03 | ND |
| 2023-10-05 | ND |
| 2023-10-05 | ND |
| 2023-12-06 | ND |
| 2023-12-06 | ND |
| 2023-12-06 | ND |
| 2024-03-05 | ND |
| 2024-06-03 | ND |
| 2024-06-12 | ND |
| 2024-07-15 | ND |