2,4,5-TP (Silvex)
Newtown Artesian Water Company
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 | ND | 1 | 0 | ND |
| 2020 | ND | 10 | 0 | ND |
| 2021 | ND | 1 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 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 |
|---|---|---|
| 2019-07-01 | 9020447-01 | ND |
| 2020-05-01 | 22195266.00 | ND |
| 2020-05-01 | 22195237.00 | ND |
| 2020-05-01 | 22195208.00 | ND |
| 2020-05-08 | 22393348.00 | ND |
| 2020-05-08 | 22393319.00 | ND |
| 2020-07-06 | 22587744.00 | ND |
| 2020-07-06 | 22587715.00 | ND |
| 2020-07-06 | 22587773.00 | ND |
| 2020-07-07 | 22587802.00 | ND |
| 2020-07-07 | 22587831.00 | ND |
| 2021-07-06 | 24809550.00 | ND |
| 2022-07-05 | 26824117.00 | ND |
| 2023-04-03 | 28681825.00 | ND |
| 2023-04-03 | 28681852.00 | ND |
| 2023-07-05 | 29283041.00 | ND |
| 2023-07-06 | 29283013.00 | ND |