2,4,5-TP (Silvex)
Wallingford 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 | 1 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 5 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2018-06-28 | CA80406 | ND |
| 2019-08-05 | CD73202-P2 | ND |
| 2019-08-05 | CD73200 | ND |
| 2019-08-12 | CD83465-P2 | ND |
| 2019-09-16 | CE10614-P2 | ND |
| 2019-10-10 | CE30938-P2 | ND |
| 2019-11-04 | CE53371-P2 | ND |
| 2020-06-08 | CG08411-P2 | ND |
| 2020-08-12 | CG53026 | ND |
| 2020-09-08 | CG72643A | ND |
| 2021-08-04 | CI88199 | ND |
| 2022-04-04 | CK99720-SOC2 | ND |
| 2022-04-06 | CL02035-SOC2 | ND |
| 2022-07-11 | CL74320 | ND |
| 2022-08-10 | CM01617-P2 | ND |
| 2022-09-06 | CM23340-P2 | ND |
| 2023-07-12 | CO49574 | ND |