2,4,5-TP (Silvex)
Middletown Water Department
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 | 5 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 1 | 0 | ND |
| 2023 | ND | 1 | 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 |
|---|---|---|
| 2018-03-01 | SOCR 200489003 | ND |
| 2018-03-28 | SOC 200490769 | ND |
| 2018-04-16 | SOC 200492153 | ND |
| 2018-08-07 | SOC 200501550 | ND |
| 2018-08-07 | SOC 200501551 | ND |
| 2019-05-21 | SOCR 200533085 | ND |
| 2020-05-06 | SOCR 200574726 | ND |
| 2021-04-07 | SOCR 200612107 | ND |
| 2021-05-26 | SOC 200618555 | ND |
| 2021-05-26 | SOC 200618557 | ND |
| 2021-08-26 | SOC 200629911 | ND |
| 2021-08-26 | SOC 200629912 | ND |
| 2022-05-11 | H300182528 300209356 | ND |
| 2023-06-23 | H300370775 300370777 | ND |