2,4,5-TP (Silvex)
City of Chubbuck
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 | ND | 1 | 0 | ND |
| 2019 | ND | 9 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-02-21 | SI80212801 | ND |
| 2019-03-28 | SI90320401 | ND |
| 2019-04-10 | SI90408601 | ND |
| 2019-06-04 | SI90604901 | ND |
| 2019-07-10 | SI90712501 | ND |
| 2019-07-24 | SI90732001 | ND |
| 2019-07-25 | SI90734601 | ND |
| 2019-09-04 | SI90903501 | ND |
| 2019-10-31 | SI91031701 | ND |
| 2019-11-05 | SI91102401 | ND |
| 2020-02-05 | SI00202601 | ND |
| 2021-02-23 | SI10214702 | ND |
| 2021-02-23 | SI10214701 | ND |
| 2021-03-16 | SI10311101 | ND |