2,4,5-TP (Silvex)
Geary
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 | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2019-09-10 | SDWA-1411796-00 | ND |
| 2019-12-10 | SDWA-1438445-00 | ND |
| 2020-02-11 | SDWA-1457716-00 | ND |
| 2021-05-03 | SDWA-1578109-00 | ND |
| 2021-09-08 | SDWA-1603064-00 | ND |
| 2021-12-08 | SDWA-1640010-00 | ND |
| 2022-02-14 | SDWA-1670762-00 | ND |
| 2022-05-17 | SDWA-1690630-00 | ND |
| 2022-07-12 | SDWA-1715539-00 | ND |
| 2022-10-11 | SDWA-1747193-00 | ND |
| 2023-01-23 | SDWA-1771687-00 | ND |
| 2023-04-26 | SDWA-1797120-00 | ND |
| 2023-07-18 | SDWA-1818692-00 | ND |