2,4,5-TP (Silvex)
Slippery Rock Municipal Authority
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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2018-03-15 | 2302800001 | ND |
| 2018-09-27 | 2341473001 | ND |
| 2020-04-09 | 22126580.00 | ND |
| 2020-04-09 | 22126609.00 | ND |
| 2020-07-09 | 22709975.00 | ND |
| 2020-08-19 | 22906867.00 | ND |
| 2023-05-04 | 29011988.00 | ND |
| 2023-05-04 | 29011989.00 | ND |
| 2023-08-10 | 29609028.00 | ND |
| 2023-08-10 | 29609057.00 | ND |