2,4,5-TP (Silvex)
City of Henderson
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 | 5 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 1 | 0 | ND |
2017 | ND | 9 | 0 | ND |
2018 | ND | 3 | 0 | ND |
2019 | ND | 1 | 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 |
---|---|---|
2014-01-23 | Q1402243001 | ND |
2014-01-23 | Q1402243002 | ND |
2014-02-13 | Q1404579010 | ND |
2014-04-09 | Q1411334004 | ND |
2014-10-08 | Q1451902007 | ND |
2016-01-27 | Q1603640005 | ND |
2017-04-17 | Q1715499024 | ND |
2017-04-17 | Q1715499027 | ND |
2017-04-17 | Q1715499026 | ND |
2017-04-17 | Q1715499025 | ND |
2017-05-19 | Q1720846004 | ND |
2017-09-14 | Q1743706007 | ND |
2017-09-14 | Q1743706016 | ND |
2017-12-07 | Q1763859011 | ND |
2017-12-07 | Q1763859008 | ND |
2018-03-13 | Q1810104013 | ND |
2018-03-13 | Q1810104012 | ND |
2018-05-24 | Q1820944003 | ND |
2019-01-10 | Q1901410003 | ND |