2,4,5-TP (Silvex)
City of League City
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | ND | 4 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 4 | 0 | ND |
2018 | ND | 1 | 0 | ND |
2019 | ND | 4 | 0 | ND |
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
Date | Lab ID | Result |
---|---|---|
2014-03-04 | AC45541 | ND |
2014-04-30 | AC52426 | ND |
2014-08-19 | AC64364 | ND |
2014-12-15 | AC75152 | ND |
2017-01-31 | AD67920 | ND |
2017-05-02 | AD82253 | ND |
2017-05-02 | AD82252 | ND |
2017-09-19 | AD96905 | ND |
2018-12-06 | AE48241 | ND |
2019-01-23 | AE51018 | ND |
2019-04-10 | AE61885 | ND |
2019-07-16 | AE74700 | ND |
2019-12-10 | AE91956 | ND |