2,4,5-TP (Silvex)
Stillwater
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 15 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 14 | 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 |
|---|---|---|
| 2020-05-21 | 20E1392-02 | ND |
| 2020-05-21 | 20E1392-03 | ND |
| 2020-05-21 | 20E1392-04 | ND |
| 2020-05-21 | 20E1395-01 | ND |
| 2020-05-21 | 20E1395-02 | ND |
| 2020-05-21 | 20E1392-01 | ND |
| 2020-07-29 | 20G2148-01 | ND |
| 2020-07-29 | 20G2148-02 | ND |
| 2020-07-29 | 20G2148-03 | ND |
| 2020-07-29 | 20G2149-01 | ND |
| 2020-07-29 | 20G2149-02 | ND |
| 2020-07-29 | 20G2149-03 | ND |
| 2020-07-29 | 20G2149-04 | ND |
| 2020-10-14 | 20J0667-01 | ND |
| 2020-10-14 | 20J0667-02 | ND |
| 2021-02-24 | 21B1311-02 | ND |
| 2023-04-27 | 23D1694-02 | ND |
| 2023-04-27 | 23D1694-03 | ND |
| 2023-04-27 | 23D1694-04 | ND |
| 2023-04-27 | 23D1698-01 | ND |
| 2023-04-27 | 23D1698-02 | ND |
| 2023-04-27 | 23D1698-03 | ND |
| 2023-04-27 | 23D1698-04 | ND |
| 2023-08-16 | 23H1903-01 | ND |
| 2023-08-16 | 23H1903-02 | ND |
| 2023-08-16 | 23H1903-03 | ND |
| 2023-08-16 | 23H1903-04 | ND |
| 2023-08-16 | 23H1906-01 | ND |
| 2023-08-16 | 23H1906-02 | ND |
| 2023-08-16 | 23H1906-03 | ND |