2,4,5-TP (Silvex)
Boise City Public Works 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 | ND | 4 | 0 | ND |
| 2020 | ND | 6 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 5 | 0 | ND |
| 2023 | ND | 5 | 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 |
|---|---|---|
| 2019-07-16 | BG17050-01 | ND |
| 2019-07-16 | BG17050-03 | ND |
| 2019-10-28 | BJ29007-03 | ND |
| 2019-10-28 | BJ29007-01 | ND |
| 2020-01-28 | CA29007-01 | ND |
| 2020-01-28 | CA29007-04 | ND |
| 2020-04-15 | CD16011-01 | ND |
| 2020-04-15 | CD16011-03 | ND |
| 2020-07-28 | CG29011-01 | ND |
| 2020-07-28 | CG29011-03 | ND |
| 2021-03-10 | DC11022-03 | ND |
| 2021-03-10 | DC11022-01 | ND |
| 2022-08-08 | EH09140-02 | ND |
| 2022-08-08 | EH09140-03 | ND |
| 2022-08-08 | EH09140-04 | ND |
| 2022-08-08 | EH09140-05 | ND |
| 2022-08-09 | EH09140-01 | ND |
| 2023-03-20 | FC21016-01 | ND |
| 2023-03-20 | FC21016-02 | ND |
| 2023-03-20 | FC21016-03 | ND |
| 2023-03-20 | FC21016-04 | ND |
| 2023-08-14 | FH15057-01 | ND |