2,4,5-TP (Silvex)
Tesoro Viejo Master Mwc, Inc.
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 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 3 | 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 |
|---|---|---|
| 2018-08-31 | CA2010017_002_002-201808310845 | ND |
| 2022-07-22 | CA2010017_002_002-202207220830 | ND |
| 2022-12-05 | CA2010017_001_001-202212051045 | ND |
| 2022-12-05 | CA2010017_006_006-202212051415 | ND |
| 2023-12-18 | CA2010017_002_002-202312180630 | ND |
| 2023-12-19 | CA2010017_001_001-202312190905 | ND |
| 2023-12-19 | CA2010017_006_006-202312190815 | ND |