2,4,5-TP (Silvex)
Marietta Public Works 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 | ND | 6 | 0 | ND |
| 2019 | ND | 6 | 0 | ND |
| 2020 | ND | 3 | 0 | ND |
| 2021 | ND | 3 | 0 | ND |
| 2022 | ND | 3 | 0 | ND |
| 2023 | ND | 3 | 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 |
|---|---|---|
| 2018-08-08 | 1808227 | ND |
| 2018-08-08 | 1808228 | ND |
| 2018-08-08 | 1808229 | ND |
| 2018-12-05 | 1812117 | ND |
| 2018-12-05 | 1812118 | ND |
| 2018-12-05 | 1812116 | ND |
| 2019-02-06 | 1902152 | ND |
| 2019-02-06 | 1902153 | ND |
| 2019-02-06 | 1902154 | ND |
| 2019-06-05 | 1906164 | ND |
| 2019-06-05 | 1906165 | ND |
| 2019-06-05 | 1906166 | ND |
| 2020-04-22 | 100773-01 | ND |
| 2020-04-22 | 100775-01 | ND |
| 2020-04-22 | 100774-01 | ND |
| 2021-04-14 | 105829-01 | ND |
| 2021-05-05 | 106064-01 | ND |
| 2021-05-05 | 106065-01 | ND |
| 2022-04-19 | 111223-01 | ND |
| 2022-05-04 | 111422-01 | ND |
| 2022-05-04 | 111423-01 | ND |
| 2023-05-17 | 117054-01 | ND |
| 2023-05-17 | 117055-01 | ND |
| 2023-05-17 | 117056-01 | ND |