2,4,5-TP (Silvex)
Upper Hanover Water 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 | N/A | 0 | 0 | N/A |
| 2020 | ND | 7 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | N/A | 0 | 0 | N/A |
| 2023 | ND | 13 | 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 |
|---|---|---|
| 2020-03-20 | 21848026.00 | ND |
| 2020-03-20 | 21848024.00 | ND |
| 2020-03-20 | 21848025.00 | ND |
| 2020-06-18 | 22417415.00 | ND |
| 2020-06-18 | 22417418.00 | ND |
| 2020-06-18 | 22417416.00 | ND |
| 2020-06-18 | 22417417.00 | ND |
| 2023-02-28 | 28703107.00 | ND |
| 2023-02-28 | 28703109.00 | ND |
| 2023-02-28 | 28703108.00 | ND |
| 2023-05-24 | 29108968.00 | ND |
| 2023-05-24 | 29108970.00 | ND |
| 2023-05-24 | 29108969.00 | ND |
| 2023-08-21 | 29700681.00 | ND |
| 2023-08-21 | 29700680.00 | ND |
| 2023-08-22 | 29700682.00 | ND |
| 2023-11-13 | 30246625.00 | ND |
| 2023-11-13 | 30246597.00 | ND |
| 2023-11-14 | 30246569.00 | ND |
| 2023-11-28 | 30246541.00 | ND |