2,4,5-TP (Silvex)
Pennsylvania American Royersford
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 11 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 10 | 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 |
|---|---|---|
| 2020-04-08 | 22016234.00 | ND |
| 2020-04-08 | 22016118.00 | ND |
| 2020-04-15 | 22016319.00 | ND |
| 2020-04-15 | 22016291.00 | ND |
| 2020-04-15 | 22016263.00 | ND |
| 2020-07-07 | 22601608.00 | ND |
| 2020-08-04 | 22792312.00 | ND |
| 2020-08-05 | 22792297.00 | ND |
| 2020-08-11 | 22792241.00 | ND |
| 2020-08-11 | 22792269.00 | ND |
| 2020-08-18 | 22792682.00 | ND |
| 2023-05-01 | 28893353.00 | ND |
| 2023-05-01 | 28893381.00 | ND |
| 2023-05-01 | 28893314.00 | ND |
| 2023-05-11 | 28893325.00 | ND |
| 2023-05-11 | 28893409.00 | ND |
| 2023-07-06 | 29296031.00 | ND |
| 2023-08-10 | 29491108.00 | ND |
| 2023-08-10 | 29491075.00 | ND |
| 2023-08-10 | 29491129.00 | ND |
| 2023-08-10 | 29491042.00 | ND |