2,4,5-TP (Silvex)
State College Boro Water Auth.
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 | 10 | 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 |
|---|---|---|
| 2020-05-13 | 22292201.00 | ND |
| 2020-05-13 | 22292174.00 | ND |
| 2020-05-13 | 22292282.00 | ND |
| 2020-05-13 | 22292228.00 | ND |
| 2020-05-13 | 22292255.00 | ND |
| 2020-08-17 | 23069139.00 | ND |
| 2020-08-17 | 22876905.00 | ND |
| 2020-08-17 | 23068956.00 | ND |
| 2020-08-17 | 22876886.00 | ND |
| 2020-08-17 | 22876929.00 | ND |
| 2023-05-15 | 28981619.00 | ND |
| 2023-05-15 | 28981628.00 | ND |
| 2023-05-15 | 28981610.00 | ND |
| 2023-05-15 | 28981642.00 | ND |
| 2023-05-15 | 28981596.00 | ND |
| 2023-08-14 | 29577808.00 | ND |
| 2023-08-16 | 29578192.00 | ND |
| 2023-08-16 | 29578134.00 | ND |
| 2023-08-16 | 29578221.00 | ND |
| 2023-08-16 | 29578163.00 | ND |