2,4,5-TP (Silvex)
City of Rexburg
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 | 3 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | ND | 4 | 0 | ND |
| 2021 | ND | 6 | 0 | ND |
| 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 |
|---|---|---|
| 2018-06-29 | SB18070177001 | ND |
| 2018-06-29 | SB18070188001 | ND |
| 2018-08-01 | S1813271 | ND |
| 2020-06-29 | SB20070003001 | ND |
| 2020-07-06 | SB20070490001 | ND |
| 2020-11-30 | SB20120066001 | ND |
| 2020-11-30 | SB20120071001 | ND |
| 2021-01-25 | SB21011645001 | ND |
| 2021-01-25 | SB21011641001 | ND |
| 2021-03-31 | SB21040230001 | ND |
| 2021-04-01 | SB21040627001 | ND |
| 2021-04-26 | SB21041931001 | ND |
| 2021-04-26 | SB21041974001 | ND |
| 2023-06-14 | SMDF068704 | ND |
| 2023-06-14 | SMDF068705 | ND |
| 2023-06-14 | SMDF068706 | ND |
| 2023-06-14 | SMDF068707 | ND |
| 2023-09-11 | SMDI035501 | ND |
| 2023-09-11 | SMDI035601 | ND |
| 2023-09-11 | SMDI035801 | ND |
| 2023-09-11 | SMDI035901 | ND |