2,4,5-TP (Silvex)
Schriever Water Treatment Service Area
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 | 4 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 2 | 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 |
|---|---|---|
| 2018-02-26 | 35377894003 | ND |
| 2018-02-26 | 35377894003 | ND |
| 2018-08-28 | 35414104001 | ND |
| 2018-08-28 | 35414104001 | ND |
| 2019-02-18 | 35449369001 | ND |
| 2019-02-18 | 35449369001 | ND |
| 2019-08-28 | 35494055001 | ND |
| 2019-08-28 | 35494055001 | ND |
| 2020-01-22 | 35526017001 | ND |
| 2020-12-03 | 35596465001 | ND |
| 2021-03-11 | 35619286001 | ND |
| 2021-11-04 | 35676092001 | ND |
| 2022-03-02 | 35701431001 | ND |
| 2022-10-12 | 35753131001 | ND |
| 2023-03-27 | 35789301002 | ND |
| 2023-12-14 | 35848534001 | ND |