2,4,5-TP (Silvex)
Arizona Water Company - Sierra Vista
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 | 14 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 14 | 0 | ND |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2018-01-23 | 201801240115SB | ND |
| 2018-01-23 | 201801240115SC | ND |
| 2018-01-23 | 201801240115SD | ND |
| 2018-01-23 | 201801240130SA | ND |
| 2018-01-23 | 201801240130SB | ND |
| 2018-01-23 | 201801240130SC | ND |
| 2018-01-23 | 201801240115SA | ND |
| 2018-07-25 | 201807250658SC | ND |
| 2018-07-25 | 201807250662SC | ND |
| 2018-07-25 | 201807250662SB | ND |
| 2018-07-25 | 201807250662SA | ND |
| 2018-07-25 | 201807250658SD | ND |
| 2018-07-25 | 201807250658SB | ND |
| 2018-07-25 | 201807250658SA | ND |
| 2021-05-20 | 21E2311-01 SOC | ND |
| 2021-05-20 | 21E2311-07SOC | ND |
| 2021-05-20 | 21E2311-06SOC | ND |
| 2021-05-20 | 21E2311-05SOC | ND |
| 2021-05-20 | 21E2311-04 SOC | ND |
| 2021-05-20 | 21E2311-03 SOC | ND |
| 2021-05-20 | 21E2311-02 SOC | ND |
| 2021-11-16 | 21K2237-01 | ND |
| 2021-11-16 | 21K2237-02 | ND |
| 2021-11-16 | 21K2237-03 | ND |
| 2021-11-17 | 21K2431-01 | ND |
| 2021-11-17 | 21K2431-02 | ND |
| 2021-11-17 | 21K2431-03 | ND |
| 2021-11-17 | 21K2431-04 | ND |