2,4,5-TP (Silvex)
Afton Public Works 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 | 3 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2020-05-11 | CE11057-01 | ND |
| 2020-08-19 | CH19170-01 | ND |
| 2020-10-05 | CJ05040-01 | ND |
| 2021-01-04 | DA04019-01 | ND |
| 2021-04-19 | DD19012-01 | ND |
| 2021-07-19 | DG19040-01 | ND |
| 2021-10-18 | DJ18014-01 | ND |
| 2022-02-22 | EB22042-01 | ND |
| 2022-05-03 | EE03131-01 | ND |
| 2022-09-19 | EI19045-01 | ND |
| 2022-11-07 | EK07041-01 | ND |
| 2023-02-21 | FB21043-01RE1 | ND |