2,4,5-TP (Silvex)
City of Manassas
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 | N/A | 0 | 0 | N/A |
2015 | ND | 2 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 3 | 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 |
---|---|---|
2015-09-14 | 460013-JAMES R. | ND |
2015-10-27 | 460013-JAMES R. | ND |
2018-06-11 | 18-11193-CAH | ND |
2018-09-11 | 18091228-01A | ND |
2018-12-17 | 18122134-01A | ND |
2019-03-15 | 19032076-01A | ND |
2019-06-07 | 19061010-02A | ND |
2019-09-05 | 19090768-01A | ND |
2019-12-17 | 7312111001-CAH | ND |