2,4,5-TP (Silvex)
South Grayson Special Utility District
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2018-02-06 | Q1804974005 | ND |
| 2018-05-04 | Q1818259002 | ND |
| 2020-08-06 | Q2031194026 | ND |
| 2020-08-06 | Q2031194029 | ND |
| 2020-08-06 | Q2031194030 | ND |
| 2020-08-06 | Q2031194031 | ND |
| 2021-06-16 | Q2115771005 | ND |
| 2023-05-16 | Q2318439002 | ND |
| 2023-05-16 | Q2318439025 | ND |
| 2023-05-16 | Q2318439026 | ND |
| 2023-05-16 | Q2318439027 | ND |