2,4,5-TP (Silvex)
Smackover Waterworks
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 | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-01-30 | 18032002302 | ND |
| 2018-05-22 | 18144007402 | ND |
| 2020-01-27 | 20030004508 | ND |
| 2020-01-27 | 20030004608 | ND |
| 2020-06-01 | 20156008502 | ND |
| 2020-06-01 | 20156008402 | ND |
| 2021-03-08 | 21070008302 | ND |
| 2021-06-07 | 21161000102 | ND |
| 2021-08-23 | 21238002401 | ND |
| 2021-11-08 | 21314008201 | ND |
| 2022-01-24 | 22027007302 | ND |
| 2022-05-25 | O198474-MCP-1 | ND |
| 2023-01-31 | O205868-MCP-1 | ND |
| 2023-01-31 | O205869-MCP-1 | ND |
| 2023-05-31 | O209481-MCP-1 | ND |
| 2023-05-31 | O209480-MCP-1 | ND |
| 2023-05-31 | O209479-MCP-1 | ND |