2,4,5-TP (Silvex)
City of Troutdale
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 | 14 | 0 | ND |
| 2021 | N/A | 0 | 0 | N/A |
| 2022 | ND | 12 | 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 |
|---|---|---|
| 2020-07-29 | VDG012105-S | ND |
| 2020-07-29 | VDG012113-S | ND |
| 2020-07-29 | VDG012101-S | ND |
| 2020-07-29 | VDG012111-S | ND |
| 2020-07-29 | VDG012109-S | ND |
| 2020-07-29 | VDG012103-S | ND |
| 2020-07-29 | VDG012107-S | ND |
| 2020-10-13 | VDI062001-S | ND |
| 2020-10-13 | VDI062007-S | ND |
| 2020-10-13 | VDI062013-S | ND |
| 2020-10-13 | VDI062003-S | ND |
| 2020-10-13 | VDI062011-S | ND |
| 2020-10-13 | VDI062005-S | ND |
| 2020-10-13 | VDI062009-S | ND |
| 2022-05-31 | 22-006289-0004-S | ND |
| 2022-05-31 | 22-006289-0001-S | ND |
| 2022-05-31 | 22-006289-0002-S | ND |
| 2022-05-31 | 22-006289-0003-S | ND |
| 2022-05-31 | 22-006289-0005-S | ND |
| 2022-05-31 | 22-006289-0006-S | ND |
| 2022-08-30 | 22-010340-0003-S | ND |
| 2022-08-30 | 22-010340-0004-S | ND |
| 2022-08-30 | 22-010340-0005-S | ND |
| 2022-08-30 | 22-010340-0001-S | ND |
| 2022-08-30 | 22-010340-0006-S | ND |
| 2022-08-30 | 22-010340-0002-S | ND |