2,4,5-TP (Silvex)
UNH/Durham Water Sys
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 | N/A | 0 | 0 | N/A |
2015 | ND | 2 | 0 | ND |
2016 | ND | 2 | 0 | ND |
2017 | ND | 2 | 0 | ND |
2018 | ND | 2 | 0 | ND |
2019 | ND | 2 | 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 |
---|---|---|
2015-07-15 | 145834.01 | ND |
2015-11-04 | 150026.01 | ND |
2016-08-17 | 159563.01 | ND |
2016-11-08 | 162651.01 | ND |
2017-09-12 | 173449.01 | ND |
2017-11-07 | 175740.01 | ND |
2018-08-30 | 186067.01 | ND |
2018-11-26 | 189601.01 | ND |
2019-08-14 | 199213.01 | ND |
2019-10-23 | 202329.01 | ND |