Pentachlorophenol
Stanley Lake Municipal Utility 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 4 | 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 | Lab ID | Result |
|---|---|---|
| 2020-08-11 | AF22950 | ND |
| 2020-08-11 | AF22951 | ND |
| 2020-08-11 | AF22953 | ND |
| 2020-11-20 | AF35534 | ND |
| 2021-01-14 | AF39596 | ND |
| 2021-04-14 | AF50205 | ND |
| 2022-08-04 | AG07952 | ND |
| 2022-10-18 | AG17452 | ND |
| 2023-01-25 | AG26309 | ND |
| 2023-01-25 | AG26314 | ND |
| 2023-01-25 | AG26321 | ND |
| 2023-04-10 | AG36126 | ND |