2,4,5-TP (Silvex)
Purcellville, Town of
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 | 5 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 4 | 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 |
|---|---|---|
| 2018-03-13 | E180100344 | ND |
| 2018-05-23 | E180303866 | ND |
| 2018-05-30 | E180303847 | ND |
| 2018-08-21 | E180601978 | ND |
| 2018-08-28 | E180601963 | ND |
| 2019-03-21 | E190302944 | ND |
| 2019-03-21 | E190302955 | ND |
| 2021-02-24 | E210100124 | ND |
| 2021-05-17 | E210400627 | ND |
| 2021-05-24 | E210400641 | ND |
| 2021-08-18 | E210601483 | ND |
| 2023-01-25 | E221203942 | ND |
| 2023-05-31 | E230305396 | ND |
| 2023-05-31 | E230305419 | ND |
| 2023-08-22 | E230603361 | ND |