2,4,5-TP (Silvex)
North Penn Water 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 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 22 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 8 | 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 |
|---|---|---|
| 2020-04-01 | 22022948.00 | ND |
| 2020-04-01 | 22023068.00 | ND |
| 2020-04-01 | 22023038.00 | ND |
| 2020-04-01 | 22022978.00 | ND |
| 2020-04-01 | 22023008.00 | ND |
| 2020-04-01 | 22023146.00 | ND |
| 2020-04-13 | 22023360.00 | ND |
| 2020-04-13 | 22023330.00 | ND |
| 2020-04-13 | 22023300.00 | ND |
| 2020-04-13 | 22023270.00 | ND |
| 2020-05-04 | 22215402.00 | ND |
| 2020-07-06 | 22607344.00 | ND |
| 2020-07-06 | 22607374.00 | ND |
| 2020-07-06 | 22607404.00 | ND |
| 2020-07-06 | 22607314.00 | ND |
| 2020-07-06 | 22608065.00 | ND |
| 2020-08-10 | 22799624.00 | ND |
| 2020-08-10 | 22799594.00 | ND |
| 2020-08-10 | 22799504.00 | ND |
| 2020-08-12 | 22799564.00 | ND |
| 2020-08-12 | 22799534.00 | ND |
| 2020-08-31 | 22999403.00 | ND |
| 2023-04-12 | 28702900.00 | ND |
| 2023-04-12 | 28702898.00 | ND |
| 2023-04-12 | 28702897.00 | ND |
| 2023-04-12 | 28702899.00 | ND |
| 2023-07-19 | 29498067.00 | ND |
| 2023-07-19 | 29498069.00 | ND |
| 2023-07-19 | 29498068.00 | ND |
| 2023-07-19 | 29498066.00 | ND |