2,4,5-TP (Silvex)
Swta - Main System
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 | 14 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2020-04-07 | 22080452.00 | ND |
| 2020-04-07 | 22080482.00 | ND |
| 2020-04-07 | 22080542.00 | ND |
| 2020-04-07 | 22080422.00 | ND |
| 2020-04-07 | 22080512.00 | ND |
| 2020-04-07 | 22080392.00 | ND |
| 2020-04-07 | 22080362.00 | ND |
| 2020-07-28 | 22854613.00 | ND |
| 2020-07-28 | 22854673.00 | ND |
| 2020-07-28 | 22854763.00 | ND |
| 2020-07-28 | 22854643.00 | ND |
| 2020-07-28 | 22854583.00 | ND |
| 2020-07-28 | 22854703.00 | ND |
| 2020-07-28 | 22854733.00 | ND |
| 2023-05-02 | 28960738.00 | ND |
| 2023-05-02 | 28960743.00 | ND |
| 2023-05-02 | 28960742.00 | ND |
| 2023-05-02 | 28960741.00 | ND |
| 2023-05-02 | 28960739.00 | ND |
| 2023-05-02 | 28960740.00 | ND |
| 2023-06-27 | 29166842.00 | ND |
| 2023-08-08 | 29556436.00 | ND |
| 2023-08-08 | 29556433.00 | ND |
| 2023-08-08 | 29556434.00 | ND |
| 2023-08-08 | 29556432.00 | ND |
| 2023-08-08 | 29556435.00 | ND |
| 2023-08-08 | 29556431.00 | ND |
| 2023-08-08 | 29556437.00 | ND |