2,4,5-TP (Silvex)
Summers Circle Water Llc
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 | 3 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 4 | 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 |
|---|---|---|
| 2018-03-05 | ND | |
| 2018-06-13 | ND | |
| 2018-08-07 | ND | |
| 2018-10-10 | ND | |
| 2019-03-18 | ND | |
| 2019-06-25 | ND | |
| 2019-11-20 | ND | |
| 2021-03-15 | 4090867 | ND |
| 2021-06-14 | 4129199 | ND |
| 2021-08-17 | 4171861 | ND |
| 2021-10-12 | 4202697 | ND |
| 2022-03-10 | 4261536 | ND |
| 2022-06-20 | 4308480 | ND |
| 2022-08-02 | 4330277 | ND |
| 2022-10-03 | 4350852 | ND |
| 2023-03-22 | 4431745 | ND |
| 2023-06-08 | 4466566 | ND |