2,4,5-TP (Silvex)
Cecilia Water Corporation
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 | 6 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2019-02-18 | 35449808002 | ND |
| 2019-02-18 | 35449808003 | ND |
| 2019-02-18 | 35449808001 | ND |
| 2019-02-18 | 35449808002 | ND |
| 2019-02-18 | 35449808003 | ND |
| 2019-02-18 | 35449808001 | ND |
| 2020-03-30 | 35540639001 | ND |
| 2020-09-28 | 35581253002 | ND |
| 2020-09-28 | 35581253003 | ND |
| 2020-12-07 | 35597474003 | ND |
| 2020-12-07 | 35597474004 | ND |
| 2021-02-01 | 35608904004 | ND |
| 2021-02-01 | 35608904003 | ND |
| 2021-05-03 | 35630992003 | ND |
| 2021-05-03 | 35630992004 | ND |
| 2022-01-31 | 35694190001 | ND |
| 2022-01-31 | 35694190002 | ND |
| 2022-01-31 | 35694190003 | ND |
| 2023-02-13 | 35779756005 | ND |
| 2023-02-13 | 35779756009 | ND |
| 2023-11-06 | 35840310001 | ND |
| 2023-11-06 | 35840310002 | ND |