2,4,5-TP (Silvex)
Paw Blue Mountain Division
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 | 1 | 0 | ND |
| 2020 | ND | 10 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2019-07-16 | 45238801 | ND |
| 2020-04-22 | 22086536.00 | ND |
| 2020-04-29 | 22278280.00 | ND |
| 2020-04-29 | 22278351.00 | ND |
| 2020-05-11 | 22278409.00 | ND |
| 2020-05-11 | 22278380.00 | ND |
| 2020-07-20 | 22668162.00 | ND |
| 2020-07-20 | 22668133.00 | ND |
| 2020-08-17 | 22861743.00 | ND |
| 2020-08-17 | 22861685.00 | ND |
| 2020-08-17 | 22861714.00 | ND |
| 2023-04-10 | 28766830.00 | ND |
| 2023-04-10 | 28766824.00 | ND |
| 2023-04-11 | 28766772.00 | ND |
| 2023-04-11 | 28766674.00 | ND |
| 2023-06-07 | 29172401.00 | ND |
| 2023-07-12 | 29363524.00 | ND |
| 2023-07-12 | 29363442.00 | ND |
| 2023-07-24 | 29363581.00 | ND |
| 2023-07-24 | 29363551.00 | ND |
| 2023-07-24 | 29363471.00 | ND |