2,4,5-TP (Silvex)
Bryan County Rural Water, Sewer & Solid Waste Management District #2
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 | 5 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 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 |
|---|---|---|
| 2018-08-29 | 18081323 | ND |
| 2018-12-19 | 1812500 | ND |
| 2019-02-06 | 1902151 | ND |
| 2019-03-13 | 1903384 | ND |
| 2019-04-17 | 1904501 | ND |
| 2019-09-18 | 1909634 | ND |
| 2019-12-18 | 1912629 | ND |
| 2020-02-19 | 2002512 | ND |
| 2020-07-22 | 102000-01 | ND |
| 2021-02-17 | 104910-01 | ND |
| 2021-07-14 | 107198-01 | ND |
| 2022-01-12 | 109841-01 | ND |
| 2022-07-20 | 112533-01 | ND |
| 2023-01-04 | 114931-01 | ND |
| 2023-07-12 | 117946-01 | ND |