2,4,5-TP (Silvex)
Ward II Water District
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 | 16 | 0 | ND |
| 2019 | ND | 2 | 0 | ND |
| 2020 | ND | 2 | 0 | ND |
| 2021 | ND | 14 | 0 | ND |
| 2022 | ND | 1 | 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 |
|---|---|---|
| 2018-05-02 | 35390161002 | ND |
| 2018-05-02 | 35390161001 | ND |
| 2018-05-02 | 35390161002 | ND |
| 2018-05-02 | 35390161001 | ND |
| 2018-06-25 | 35400823001 | ND |
| 2018-06-25 | 35400823002 | ND |
| 2018-06-25 | 35400823003 | ND |
| 2018-06-25 | 35400823004 | ND |
| 2018-06-25 | 35400823005 | ND |
| 2018-06-25 | 35400823005 | ND |
| 2018-06-25 | 35400823001 | ND |
| 2018-06-25 | 35400823002 | ND |
| 2018-06-25 | 35400823003 | ND |
| 2018-06-25 | 35400823004 | ND |
| 2018-09-10 | 35417396001 | ND |
| 2018-09-10 | 35417396001 | ND |
| 2019-07-24 | 35485209001 | ND |
| 2019-07-24 | 35485209001 | ND |
| 2020-06-23 | 35558765001 | ND |
| 2020-06-23 | 35558765002 | ND |
| 2021-03-29 | 35622757003 | ND |
| 2021-03-29 | 35622757002 | ND |
| 2021-03-29 | 35622757001 | ND |
| 2021-06-14 | 35641231005 | ND |
| 2021-06-14 | 35641231004 | ND |
| 2021-06-14 | 35641231001 | ND |
| 2021-06-14 | 35641231002 | ND |
| 2021-06-14 | 35641231003 | ND |
| 2021-06-28 | 35644430001 | ND |
| 2021-06-28 | 35644434003 | ND |
| 2021-06-28 | 35644434002 | ND |
| 2021-06-28 | 35644434001 | ND |
| 2021-06-28 | 35644430003 | ND |
| 2021-06-28 | 35644430002 | ND |
| 2022-08-22 | 35742597001 | ND |
| 2023-05-08 | 35799020001 | ND |
| 2023-05-08 | 35799020002 | ND |
| 2023-05-08 | 35799020003 | ND |
| 2023-05-08 | 35799020004 | ND |
| 2023-05-08 | 35799020005 | ND |