Pentachlorophenol
Mille Lacs Island Resort
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 | 2 | 0 | ND |
| 2021 | 0.235 ppb | 2 | 2 | 0.220 ppb - 0.250 ppb |
| 2022 | 0.225 ppb | 2 | 2 | 0.210 ppb - 0.240 ppb |
| 2023 | 0.0925 ppb | 4 | 2 | ND - 0.190 ppb |
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 |
|---|---|---|
| 2020-10-02 | 20J0179-01 | ND |
| 2020-10-02 | 20J0179-02 | ND |
| 2021-06-30 | 21F1878-01 | 0.250 ppb |
| 2021-08-10 | 21H0853-01 | 0.220 ppb |
| 2022-05-17 | 22E1407-01 | 0.240 ppb |
| 2022-07-12 | 22G0658-02 | 0.210 ppb |
| 2023-01-09 | 23A0178-01 | ND |
| 2023-06-01 | 23F0180-01 | 0.190 ppb |
| 2023-07-27 | 23G1982-01 | 0.180 ppb |
| 2023-07-27 | 23G1984-02 | ND |