2,4,5-TP (Silvex)
Cloquet
2(2,4,5-trichlorophenoxy) propionic acid (2,4,5-TP or Silvex) is a cancer-causing herbicide banned in the U.S. in 1985 because of its toxicity. It is still detected as a groundwater contaminant in areas where it was sprayed or stored.
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 | ND | 2 | 0 | ND |
| 2020 | ND | 8 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 9 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 3 ppb
The EWG Health Guideline of 3 ppb for 2,4,5-TP 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 harm to internal organs.
EPA Maximum Contaminant
Level (MCL): 50 ppb
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2019-08-21 | 19H1956-02 | ND |
| 2019-08-21 | 19H1956-01 | ND |
| 2020-03-18 | 20C0831-01 | ND |
| 2020-03-18 | 20C0831-02 | ND |
| 2020-03-18 | 20C0831-03 | ND |
| 2020-03-18 | 20C0831-04 | ND |
| 2020-05-27 | 20E1779-04 | ND |
| 2020-05-27 | 20E1779-03 | ND |
| 2020-05-27 | 20E1779-02 | ND |
| 2020-05-27 | 20E1779-01 | ND |
| 2023-06-06 | 23F0473-01 | ND |
| 2023-06-06 | 23F0473-02 | ND |
| 2023-06-06 | 23F0473-03 | ND |
| 2023-06-06 | 23F0473-04 | ND |
| 2023-09-07 | 23I0303-01 | ND |
| 2023-09-07 | 23I0306-01 | ND |
| 2023-09-07 | 23I0307-01 | ND |
| 2023-09-07 | 23I0318-01 | ND |
| 2023-10-17 | 23J0903-01 | ND |