2,4,5-TP (Silvex)
Brodhead Creek Reg Water Authority
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 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 |
|---|---|---|
| 2020-04-13 | 22045786.00 | ND |
| 2020-04-15 | 22045701.00 | ND |
| 2020-09-09 | 23021231.00 | ND |
| 2020-09-09 | 23021224.00 | ND |
| 2021-10-20 | 25427428.00 | ND |
| 2022-02-23 | 26137335.00 | ND |
| 2022-05-23 | 26671981.00 | ND |
| 2022-08-22 | 27258388.00 | ND |
| 2023-05-05 | 30265901.00 | ND |
| 2023-05-05 | 30265902.00 | ND |
| 2023-05-05 | 30265900.00 | ND |
| 2023-08-14 | 29907579.00 | ND |
| 2023-08-14 | 29521942.00 | ND |
| 2023-08-14 | 29521907.00 | ND |
| 2023-08-14 | 29907578.00 | ND |
| 2023-08-16 | 29907580.00 | ND |
| 2023-08-16 | 29521977.00 | ND |