Pentachlorophenol
Bear Valley Joint Authority
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 | 4 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2018-04-24 | 8045215-01 | ND |
| 2018-05-29 | 8055386-01 | ND |
| 2018-07-17 | 8074944-01 | ND |
| 2018-11-27 | 8114887-01 | ND |
| 2019-02-19 | 9024042-01 | ND |
| 2019-11-13 | 9036887-01 | ND |
| 2020-01-29 | 21798043.00 | ND |
| 2020-04-15 | 22362558.00 | ND |
| 2020-04-29 | 22362578.00 | ND |
| 2020-07-29 | 22949615.00 | ND |
| 2020-08-19 | 23136914.00 | ND |
| 2023-05-15 | 29053721.00 | ND |
| 2023-05-15 | 29053736.00 | ND |
| 2023-07-18 | 29651640.00 | ND |
| 2023-07-18 | 29651676.00 | ND |