2,4,5-TP (Silvex)
Valley Water and Sewer-deerwood
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 | N/A | 0 | 0 | N/A |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2019-08-06 | 680-172767-1 | ND |
| 2020-03-18 | 481646 | ND |
| 2020-06-03 | 487811 | ND |
| 2020-09-02 | 497137 | ND |
| 2020-12-01 | 505423 | ND |
| 2021-03-16 | 1034275-01 | ND |
| 2021-06-10 | 1063668-01 | ND |
| 2021-09-24 | 810-3691-1 | ND |
| 2021-09-24 | 810-3693-1 | ND |
| 2022-08-18 | FWH0299 | ND |
| 2022-10-26 | FWJ0182-01 | ND |
| 2023-02-16 | FXB0441-01 | ND |
| 2023-04-06 | FXC0466 | ND |
| 2023-08-29 | FXH0906 | ND |