2,4,5-TP (Silvex)
Rosemount
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 | 5 | 0 | ND |
| 2019 | ND | 8 | 0 | ND |
| 2020 | ND | 7 | 0 | ND |
| 2021 | ND | 2 | 0 | ND |
| 2022 | ND | 10 | 0 | ND |
| 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 |
|---|---|---|
| 2018-10-24 | 18J1245-03 | ND |
| 2018-10-24 | 18J1247-02 | ND |
| 2018-10-24 | 18J1247-03 | ND |
| 2018-10-24 | 18J1247-04 | ND |
| 2018-10-24 | 18J1245-02 | ND |
| 2019-02-15 | 19B0720-01 | ND |
| 2019-02-15 | 19B0720-02 | ND |
| 2019-02-15 | 19B0720-03 | ND |
| 2019-02-15 | 19B0720-04 | ND |
| 2019-02-15 | 19B0722-01 | ND |
| 2019-04-29 | 19D2437-01 | ND |
| 2019-09-12 | 19I0608-01 | ND |
| 2019-11-25 | 19K1669-01 | ND |
| 2020-01-07 | 20A0140-05 | ND |
| 2020-01-07 | 20A0140-04 | ND |
| 2020-01-07 | 20A0140-01 | ND |
| 2020-01-07 | 20A0140-02 | ND |
| 2020-05-19 | 20E1080-02 | ND |
| 2020-05-19 | 20E1080-03 | ND |
| 2020-05-19 | 20E1080-04 | ND |
| 2021-05-03 | 21E0039-03 | ND |
| 2021-08-11 | 21H0961-01 | ND |
| 2022-08-16 | 22H1498-02 | ND |
| 2022-08-16 | 22H1499-04 | ND |
| 2022-08-16 | 22H1499-03 | ND |
| 2022-08-16 | 22H1499-02 | ND |
| 2022-08-16 | 22H1498-01 | ND |
| 2022-10-11 | 22J0399-01 | ND |
| 2022-10-11 | 22J0400-01 | ND |
| 2022-10-11 | 22J0400-02 | ND |
| 2022-10-11 | 22J0400-03 | ND |
| 2022-10-11 | 22J0400-04 | ND |