2,4,5-TP (Silvex)
Warrington Twp Water&sew Dept
NOTE: Warrington Twp Water&sew Dept purchases water from North Wales Water Authority which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by North Wales 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 | 1 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 7 | 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
NOTE: Warrington Twp Water&sew Dept purchases water from North Wales Water Authority which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by North Wales Water Authority.
| Date | Lab ID | Result |
|---|---|---|
| 2020-04-01 | 22025495.00 | ND |
| 2020-04-20 | 22026160.00 | ND |
| 2020-04-20 | 22026190.00 | ND |
| 2020-04-20 | 22026130.00 | ND |
| 2020-04-20 | 22026100.00 | ND |
| 2020-04-27 | 22217321.00 | ND |
| 2020-04-27 | 22217381.00 | ND |
| 2020-04-27 | 22217418.00 | ND |
| 2020-04-27 | 22217291.00 | ND |
| 2020-04-27 | 22217351.00 | ND |
| 2020-07-06 | 22609718.00 | ND |
| 2020-07-27 | 22801128.00 | ND |
| 2020-07-27 | 22801159.00 | ND |
| 2020-07-27 | 22801178.00 | ND |
| 2020-07-27 | 22801098.00 | ND |
| 2020-07-27 | 22801219.00 | ND |
| 2020-08-31 | 23001492.00 | ND |
| 2020-08-31 | 23001464.00 | ND |
| 2020-08-31 | 23001436.00 | ND |
| 2020-08-31 | 23001520.00 | ND |
| 2022-07-05 | 27039498.00 | ND |
| 2023-04-03 | 28705020.00 | ND |
| 2023-04-03 | 28705016.00 | ND |
| 2023-04-03 | 28705019.00 | ND |
| 2023-04-03 | 28705018.00 | ND |
| 2023-04-03 | 28705017.00 | ND |
| 2023-04-04 | 28705015.00 | ND |
| 2023-06-27 | 29110718.00 | ND |
| 2023-07-10 | 29304405.00 | ND |
| 2023-07-10 | 29304404.00 | ND |
| 2023-07-10 | 29304402.00 | ND |
| 2023-07-10 | 29304401.00 | ND |
| 2023-07-11 | 29304406.00 | ND |
| 2023-07-11 | 29304403.00 | ND |
| 2023-07-11 | 29304407.00 | ND |