2,4,5-TP (Silvex)
Aquarion Water Company of Connecticut - Greenwich 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 | ND | 2 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 6 | 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 |
|---|---|---|
| 2018-06-04 | 201807485-SOCR | ND |
| 2018-06-04 | 201807476-SOCR | ND |
| 2019-06-03 | 201907836-SOCR | ND |
| 2019-06-03 | 201907864-SOCR | ND |
| 2019-07-01 | 201909729-SOC | ND |
| 2019-07-02 | 201909869-SOC | ND |
| 2019-10-01 | 201915908-SOC | ND |
| 2019-11-11 | 201918481-SOC | ND |
| 2020-06-01 | 202007935-SOCR | ND |
| 2020-06-02 | 202008059-SOCR | ND |
| 2021-06-01 | 202107741-SOCR | ND |
| 2021-06-02 | 202107862-SOCR | ND |
| 2022-06-06 | 202209005-SOCR | ND |
| 2022-06-07 | 202209099-SOCR | ND |
| 2022-08-29 | 202215057-SOC | ND |
| 2022-09-19 | 202216453-SOC | ND |
| 2022-10-03 | 202217572-SOC | ND |
| 2022-10-04 | 202217668-SOC | ND |
| 2023-06-05 | 202309186-SOCR | ND |
| 2023-06-06 | 202309336-SOCR | ND |