2,4,5-TP (Silvex)
Medford Water Commission
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 | 5 | 0 | ND |
| 2021 | ND | 4 | 0 | ND |
| 2022 | ND | 2 | 0 | ND |
| 2023 | ND | 4 | 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 |
|---|---|---|
| 2020-01-08 | 2001031002-S | ND |
| 2020-01-08 | 2001031001-S | ND |
| 2020-06-25 | 2006116401A-S | ND |
| 2020-08-19 | 2008082301A-S | ND |
| 2020-08-19 | 2008082301-S | ND |
| 2021-01-28 | 2101107502-S | ND |
| 2021-01-28 | 2101107502B-S | ND |
| 2021-01-28 | 2101107501-S | ND |
| 2021-01-28 | 2101107501B-S | ND |
| 2022-01-31 | 2201113101A-S | ND |
| 2022-01-31 | 2201113102A-S | ND |
| 2023-01-27 | 23010989-02-S | ND |
| 2023-01-27 | 23010989-01-S | ND |
| 2023-06-15 | 23060760-01C-S | ND |
| 2023-09-12 | 23090413-01A-S | ND |