2,4,5-TP (Silvex)
Red Oak Terrace
NOTE: Red Oak Terrace purchases water from City of Tomball which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Tomball.
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 |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | N/A | 0 | 0 | N/A |
ppb = parts per billion
State and national drinking water standards and health guidelines
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: Red Oak Terrace purchases water from City of Tomball which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by City of Tomball.
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-13 | AC38615 | ND |
| 2014-01-13 | AC38609 | ND |
| 2017-02-02 | AD68484 | ND |
| 2017-02-02 | AD68485 | ND |