Pentachlorophenol
Mountain Regional Water Special Service District
Pentachlorophenol is a carcinogenic chemical used as a wood preservative. It harms developing fetuses, and causes immune suppression and hormone disruption.
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 | ND | 7 | 0 | ND |
| 2019 | ND | 21 | 0 | ND |
| 2020 | ND | 15 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 9 | 0 | ND |
| 2023 | ND | 18 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.3 ppb
The EWG Health Guideline of 0.3 ppb for pentachlorophenol was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer.
EPA Maximum Contaminant
Level (MCL): 1 ppb
The legal limit for pentachlorophenol, established in 1991, was based on analytical detection limits at the time that the standard was set.
ppb = parts per billion
All test results
| Date | Result |
|---|---|
| 2018-03-20 | ND |
| 2018-06-06 | ND |
| 2018-06-06 | ND |
| 2018-06-20 | ND |
| 2018-08-23 | ND |
| 2018-09-05 | ND |
| 2018-10-23 | ND |
| 2019-01-03 | ND |
| 2019-01-03 | ND |
| 2019-01-03 | ND |
| 2019-01-24 | ND |
| 2019-01-24 | ND |
| 2019-02-25 | ND |
| 2019-02-25 | ND |
| 2019-02-25 | ND |
| 2019-03-20 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-06-27 | ND |
| 2019-11-07 | ND |
| 2019-11-14 | ND |
| 2020-02-27 | ND |
| 2020-03-24 | ND |
| 2020-07-14 | ND |
| 2020-09-21 | ND |
| 2020-12-04 | ND |
| 2020-12-04 | ND |
| 2020-12-04 | ND |
| 2020-12-04 | ND |
| 2020-12-04 | ND |
| 2020-12-22 | ND |
| 2020-12-22 | ND |
| 2020-12-22 | ND |
| 2020-12-22 | ND |
| 2020-12-22 | ND |
| 2020-12-22 | ND |
| 2022-02-17 | ND |
| 2022-05-04 | ND |
| 2022-05-05 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-08-04 | ND |
| 2022-09-07 | ND |
| 2022-12-06 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-07-11 | ND |
| 2023-11-06 | ND |
| 2023-11-06 | ND |
| 2023-11-06 | ND |
| 2023-12-11 | ND |
| 2023-12-11 | ND |
| 2023-12-11 | ND |
| 2023-12-11 | ND |
| 2023-12-11 | ND |
| 2023-12-11 | ND |