2,4,5-TP (Silvex)
Waterbury 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 | 4 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 5 | 0 | ND |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-10-17 | RWA200509564SOCR | ND |
| 2018-10-17 | RWA200509566SOCR | ND |
| 2018-10-17 | RWA200509568SOCR | ND |
| 2018-10-18 | RWA200509712SOC2 | ND |
| 2019-01-15 | RWA200518766SOC2 | ND |
| 2021-09-14 | RWA300059421 | ND |
| 2021-09-14 | RWA300059428 | ND |
| 2021-09-14 | RWA300059435 | ND |
| 2022-02-15 | 300146398 | ND |
| 2022-09-14 | RWA300244154 | ND |
| 2022-09-15 | RWA300253094 | ND |
| 2022-09-15 | RWA300253095 | ND |
| 2022-09-15 | RWA300253096 | ND |