2,4,5-TP (Silvex)
Farmington
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 | 2 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 8 | 0 | ND |
| 2022 | ND | 4 | 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 |
|---|---|---|
| 2018-01-03 | 18A0035-04 | ND |
| 2018-05-03 | 18E0322-01 | ND |
| 2020-07-30 | 20G2366-01 | ND |
| 2020-10-22 | 20J1183-01 | ND |
| 2020-10-22 | 20J1183-02 | ND |
| 2020-10-22 | 20J1185-04 | ND |
| 2021-02-18 | 21B1013-01 | ND |
| 2021-02-18 | 21B1013-02 | ND |
| 2021-02-18 | 21B1013-03 | ND |
| 2021-02-18 | 21B1013-04 | ND |
| 2021-05-03 | 21E0037-01 | ND |
| 2021-05-03 | 21E0037-03 | ND |
| 2021-05-03 | 21E0037-02 | ND |
| 2021-08-11 | 21H0954-01 | ND |
| 2022-03-08 | 22C0323-01 | ND |
| 2022-05-17 | 22E1317-01 | ND |
| 2022-07-25 | 22G1722-01 | ND |
| 2022-12-20 | 22L0971-01 | ND |
| 2023-01-11 | 23A0311-01 | ND |
| 2023-04-19 | 23D1148-01 | ND |