2,4,5-TP (Silvex)
Danbury 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 | 4 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 4 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-10-11 | SOCR 200508919 | ND |
| 2018-10-11 | SOCR 200508918 | ND |
| 2019-06-20 | SOC 200537240 | ND |
| 2019-06-20 | SOC 200537278 | ND |
| 2019-12-04 | SOC 200558922 | ND |
| 2019-12-04 | SOC 200558921 | ND |
| 2020-03-19 | SOCR 200569997 | ND |
| 2020-03-19 | SOCR 200569998 | ND |
| 2021-04-15 | SOCR 200613293 | ND |
| 2021-04-15 | SOCR 200613290 | ND |
| 2022-08-11 | 292975 | ND |
| 2022-08-11 | 292977 | ND |
| 2022-11-03 | 300312 | ND |
| 2022-11-03 | 300311 | ND |
| 2023-01-12 | 304532 | ND |
| 2023-01-12 | 304533 | ND |
| 2023-10-11 | CP24524 | ND |
| 2023-10-11 | CP24526 | ND |