2,4,5-TP (Silvex)
Fort Bend County Municipal Utility District 46
NOTE: Fort Bend County Municipal Utility District 46 purchases water from City of Missouri City Mustang Bayou Wate which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Missouri City Mustang Bayou Wate.
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 | 3 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
| 2020 | ND | 1 | 0 | ND |
| 2021 | ND | 5 | 0 | ND |
| 2022 | ND | 1 | 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
NOTE: Fort Bend County Municipal Utility District 46 purchases water from City of Missouri City Mustang Bayou Wate which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Missouri City Mustang Bayou Wate.
| Date | Lab ID | Result |
|---|---|---|
| 2018-02-28 | AE16115 | ND |
| 2018-05-01 | AE24646 | ND |
| 2018-05-01 | AE24647 | ND |
| 2019-04-18 | AE63022 | ND |
| 2020-07-16 | AF19759 | ND |
| 2020-12-15 | AF37722 | ND |
| 2021-02-26 | AF44724 | ND |
| 2021-02-26 | AF44726 | ND |
| 2021-05-12 | AF53642 | ND |
| 2021-05-12 | AF53652 | ND |
| 2021-08-10 | AF65686 | ND |
| 2022-05-17 | AF97310 | ND |
| 2023-05-04 | AG39434 | ND |