2,4,5-TP (Silvex)
Patton Village West Water 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 | 1 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 6 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2018-09-19 | AE40833 | ND |
| 2020-07-30 | AF21465 | ND |
| 2020-07-30 | AF21466 | ND |
| 2020-07-30 | AF21467 | ND |
| 2020-10-05 | AF29537 | ND |
| 2020-10-05 | AF29538 | ND |
| 2020-10-05 | AF29545 | ND |
| 2021-01-12 | AF38918 | ND |
| 2021-01-12 | AF38915 | ND |
| 2021-05-07 | AF53064 | ND |
| 2022-08-10 | AG08658 | ND |
| 2022-10-18 | AG17503 | ND |
| 2023-01-10 | AG23826 | ND |
| 2023-04-03 | AG35210 | ND |
| 2023-05-10 | AG40085 | ND |
| 2023-07-14 | AG48861 | ND |
| 2023-10-26 | AG61334 | ND |