2,4,5-TP (Silvex)
Summit Township Water Authority
NOTE: Summit Township Water Authority purchases water from Erie City Water Authority which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Erie City 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 | ND | 1 | 0 | ND |
| 2019 | ND | 4 | 0 | ND |
| 2020 | ND | 6 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 3 | 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: Summit Township Water Authority purchases water from Erie City Water Authority which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Erie City Water Authority.
| Date | Lab ID | Result |
|---|---|---|
| 2018-01-08 | 3849221 | ND |
| 2018-05-21 | 3941481 | ND |
| 2018-08-21 | 4030518 | ND |
| 2019-05-21 | 4302825 | ND |
| 2019-09-10 | 4415509 | ND |
| 2019-11-18 | 4489105 | ND |
| 2020-04-01 | 22141736.00 | ND |
| 2020-05-18 | 22336512.00 | ND |
| 2020-08-26 | 22923680.00 | ND |
| 2020-09-23 | 23112751.00 | ND |
| 2023-04-04 | 28826547.00 | ND |
| 2023-04-18 | 28826414.00 | ND |
| 2023-08-09 | 29625450.00 | ND |
| 2023-09-14 | 29816667.00 | ND |