2,4,5-TP (Silvex)
Bristol Water Department
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 | ND | 1 | 0 | ND |
| 2020 | ND | 5 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-04-05 | D8D0436-01SOCR | ND |
| 2018-07-09 | D8G0647-01SOC | ND |
| 2019-03-27 | D9C2625-01SOCR | ND |
| 2020-02-26 | D0B2110-01SOC | ND |
| 2020-02-26 | D0B2110-02SOC | ND |
| 2020-02-26 | D0B2110-03SOC | ND |
| 2020-02-26 | D0B2110-04SOC | ND |
| 2020-02-26 | D0B2111-01SOCR | ND |
| 2021-02-25 | D1B2160-01SOC | ND |
| 2021-02-25 | D1B2162-01SOC | ND |
| 2022-02-03 | D2B0371-01SOC | ND |
| 2023-02-23 | D3B2330-01SOC | ND |
| 2023-03-06 | D3C0647-01SOC | ND |
| 2023-03-06 | D3C0647-02SOC | ND |
| 2023-03-06 | D3C0647-03SOC | ND |
| 2023-03-15 | D3C1379-02SOC | ND |