2,4,5-TP (Silvex)
Minden Water System
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 | 18 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
| 2020 | N/A | 0 | 0 | N/A |
| 2021 | ND | 18 | 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 |
|---|---|---|
| 2018-06-25 | 35400742002 | ND |
| 2018-06-25 | 35400742001 | ND |
| 2018-06-25 | 35400742009 | ND |
| 2018-06-25 | 35400742008 | ND |
| 2018-06-25 | 35400742007 | ND |
| 2018-06-25 | 35400742006 | ND |
| 2018-06-25 | 35400742005 | ND |
| 2018-06-25 | 35400742004 | ND |
| 2018-06-25 | 35400742003 | ND |
| 2018-06-25 | 35400742002 | ND |
| 2018-06-25 | 35400742009 | ND |
| 2018-06-25 | 35400742008 | ND |
| 2018-06-25 | 35400742007 | ND |
| 2018-06-25 | 35400742006 | ND |
| 2018-06-25 | 35400742005 | ND |
| 2018-06-25 | 35400742004 | ND |
| 2018-06-25 | 35400742003 | ND |
| 2018-06-25 | 35400742001 | ND |
| 2021-04-13 | 35625915001 | ND |
| 2021-04-13 | 35625915002 | ND |
| 2021-04-13 | 35625915003 | ND |
| 2021-04-13 | 35625915004 | ND |
| 2021-04-13 | 35626547001 | ND |
| 2021-04-13 | 35626547002 | ND |
| 2021-04-13 | 35626547003 | ND |
| 2021-04-13 | 35626547004 | ND |
| 2021-04-13 | 35626547005 | ND |
| 2021-05-27 | 35636911008 | ND |
| 2021-05-27 | 35636911007 | ND |
| 2021-05-27 | 35636911006 | ND |
| 2021-05-27 | 35636911005 | ND |
| 2021-05-27 | 35636911004 | ND |
| 2021-05-27 | 35636911003 | ND |
| 2021-05-27 | 35636911002 | ND |
| 2021-05-27 | 35636911001 | ND |
| 2021-06-17 | 35641728002 | ND |