2,4,5-TP (Silvex)
Collegeville Trappe Joint Public Works Department
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 | 20 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 20 | 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 |
|---|---|---|
| 2020-05-04 | 22213276.00 | ND |
| 2020-05-04 | 22213246.00 | ND |
| 2020-05-04 | 22213306.00 | ND |
| 2020-05-18 | 22213543.00 | ND |
| 2020-05-18 | 22213519.00 | ND |
| 2020-05-18 | 22213573.00 | ND |
| 2020-05-18 | 22213489.00 | ND |
| 2020-06-08 | 22414098.00 | ND |
| 2020-06-08 | 22414158.00 | ND |
| 2020-06-08 | 22414128.00 | ND |
| 2020-08-03 | 22797502.00 | ND |
| 2020-08-03 | 22797277.00 | ND |
| 2020-08-03 | 22797367.00 | ND |
| 2020-08-03 | 22797307.00 | ND |
| 2020-08-03 | 22797337.00 | ND |
| 2020-08-17 | 22797882.00 | ND |
| 2020-08-17 | 22797853.00 | ND |
| 2020-08-17 | 22797824.00 | ND |
| 2020-08-17 | 22797795.00 | ND |
| 2020-08-17 | 22797765.00 | ND |
| 2023-04-17 | 28700876.00 | ND |
| 2023-04-17 | 28700873.00 | ND |
| 2023-04-17 | 28700878.00 | ND |
| 2023-04-17 | 28700877.00 | ND |
| 2023-04-17 | 28700875.00 | ND |
| 2023-04-17 | 28700874.00 | ND |
| 2023-05-01 | 28898968.00 | ND |
| 2023-05-01 | 28898967.00 | ND |
| 2023-05-01 | 28898966.00 | ND |
| 2023-05-01 | 28898969.00 | ND |
| 2023-07-24 | 29495842.00 | ND |
| 2023-07-24 | 29495844.00 | ND |
| 2023-07-24 | 29495843.00 | ND |
| 2023-07-24 | 29495841.00 | ND |
| 2023-07-24 | 29495840.00 | ND |
| 2023-08-07 | 29495847.00 | ND |
| 2023-08-07 | 29495848.00 | ND |
| 2023-08-07 | 29495846.00 | ND |
| 2023-08-07 | 29495845.00 | ND |
| 2023-08-21 | 29496178.00 | ND |