2,4,5-TP (Silvex)
Lehigh County Authority Allentown Division
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 | 8 | 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 | 22077912.00 | ND |
| 2020-04-14 | 22077868.00 | ND |
| 2020-04-14 | 22077832.00 | ND |
| 2020-04-22 | 22078446.00 | ND |
| 2020-07-08 | 22660552.00 | ND |
| 2020-07-16 | 22660592.00 | ND |
| 2020-07-22 | 22660666.00 | ND |
| 2020-07-22 | 22660628.00 | ND |
| 2023-04-11 | 28759110.00 | ND |
| 2023-04-11 | 28759111.00 | ND |
| 2023-04-19 | 28759271.00 | ND |
| 2023-04-26 | 28958460.00 | ND |
| 2023-04-26 | 28958459.00 | ND |
| 2023-07-11 | 29355976.00 | ND |
| 2023-07-11 | 29355975.00 | ND |
| 2023-07-18 | 29355913.00 | ND |
| 2023-07-18 | 29355914.00 | ND |
| 2023-07-25 | 29554468.00 | ND |