Pentachlorophenol
Lacey Water Department
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 | N/A | 0 | 0 | N/A |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 9 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2021-05-05 | 4115199 | ND |
| 2021-12-06 | 4216632 | ND |
| 2022-05-24 | 4286813 | ND |
| 2022-05-24 | 4286812 | ND |
| 2022-05-24 | 4286810 | ND |
| 2022-08-10 | 4331473 | ND |
| 2022-08-10 | 4331472 | ND |
| 2022-08-10 | 4331461 | ND |
| 2022-08-11 | 4331471 | ND |
| 2022-08-11 | 4331475 | ND |
| 2022-08-11 | 4331474 | ND |
| 2023-03-30 | 4434581 | ND |
| 2023-06-21 | 4481504 | ND |