2,4,5-TP (Silvex)
City of Norfolk
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | ND | 8 | 0 | ND |
2015 | ND | 8 | 0 | ND |
2016 | ND | 8 | 0 | ND |
2017 | ND | 8 | 0 | ND |
2018 | ND | 8 | 0 | ND |
2019 | ND | 8 | 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 |
---|---|---|
2014-02-11 | 201402120483-CAH | ND |
2014-02-11 | 201402120489-CAH | ND |
2014-05-13 | 201405140546-CAH | ND |
2014-05-13 | 201405140544-CAH | ND |
2014-08-12 | 201408130294-CAH | ND |
2014-08-12 | 201408130296-CAH | ND |
2014-11-12 | 201411130833-CAH | ND |
2014-11-12 | 201411130557-CAH | ND |
2015-02-10 | 460260-EUROFINS | ND |
2015-02-10 | 460260-EUROFINS | ND |
2015-05-12 | 460260-EUROFINS | ND |
2015-05-12 | 460260-EUROFINS | ND |
2015-08-11 | 460260-EUROFINS | ND |
2015-08-11 | 460260-EUROFINS | ND |
2015-11-09 | 460260-EUROFINS | ND |
2015-11-09 | 460260-EUROFINS | ND |
2016-02-09 | 201602100120-CAH | ND |
2016-02-09 | 201602100122-CAH | ND |
2016-05-10 | 201605110161-CAH | ND |
2016-05-10 | 201605110160-CAH | ND |
2016-08-09 | 201608110693-CAH | ND |
2016-08-09 | 201608100233-CAH | ND |
2016-11-08 | 201611090228-CAH | ND |
2016-11-08 | 201611090230-CAH | ND |
2017-02-14 | 201702151127-CAH | ND |
2017-02-14 | 201702151042-CAH | ND |
2017-05-09 | 201705100872-CAH | ND |
2017-05-09 | 201705100790-CAH | ND |
2017-08-08 | 201708100347-CAH | ND |
2017-08-08 | 201708091172-CAH | ND |
2017-11-14 | 201711151069-CAH | ND |
2017-11-14 | 201711150304-CAH | ND |
2018-02-13 | 201802151032-CAH | ND |
2018-02-13 | 201802150969-CAH | ND |
2018-05-08 | 201805090974-CAH | ND |
2018-05-08 | 201805091234-CAH | ND |
2018-08-14 | 201808160459-CAH | ND |
2018-08-14 | 201808160579-CAH | ND |
2018-11-13 | 201811140123-CAH | ND |
2018-11-13 | 201811140388-CAH | ND |
2019-02-12 | 201902130366-CAH | ND |
2019-02-12 | 201902130449-CAH | ND |
2019-05-14 | 201905150501-CAH | ND |
2019-05-14 | 201905150578-CAH | ND |
2019-08-13 | 201908140712-CAH | ND |
2019-08-13 | 201908150787-CAH | ND |
2019-11-12 | 201911130679-CAH | ND |
2019-11-12 | 201911130523-CAH | ND |