2,4,5-TP (Silvex)
Nash Forreston Water Supply Corporation
NOTE: Nash Forreston Water Supply Corporation purchases water from City of Waxahachie which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Waxahachie.
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 | 2 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 1 | 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
NOTE: Nash Forreston Water Supply Corporation purchases water from City of Waxahachie which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Waxahachie.
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-25 | Q1802982016 | ND |
| 2019-04-29 | Q1916965003 | ND |
| 2019-04-29 | Q1916965013 | ND |
| 2020-08-17 | Q2032738003 | ND |
| 2021-09-16 | Q2125453003 | ND |
| 2022-01-12 | Q2201052013 | ND |
| 2022-01-12 | Q2201052018 | ND |
| 2023-11-20 | Q2349758009 | ND |