2,4,5-TP (Silvex)
Gowc North 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 7 | 0 | ND |
| 2023 | ND | 7 | 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 |
|---|---|---|
| 2020-12-02 | 35596280001 | ND |
| 2021-02-01 | 35608834004 | ND |
| 2021-05-03 | 35630681004 | ND |
| 2021-05-03 | 35630681005 | ND |
| 2022-02-09 | 35696474003 | ND |
| 2022-02-09 | 35696474004 | ND |
| 2022-04-04 | 35708518003 | ND |
| 2022-04-04 | 35708518004 | ND |
| 2022-09-27 | 35750438002 | ND |
| 2022-10-24 | 35755885002 | ND |
| 2022-10-24 | 35755885001 | ND |
| 2023-01-23 | 35774809001 | ND |
| 2023-01-27 | 35777481001 | ND |
| 2023-02-22 | 35781903001 | ND |
| 2023-04-03 | 35790249001 | ND |
| 2023-04-03 | 35790249002 | ND |
| 2023-07-10 | 35812564001 | ND |
| 2023-07-10 | 35812564002 | ND |