2,4,5-TP (Silvex)
Henry County Water Authority
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 | 2 | 0 | ND |
2015 | ND | 2 | 0 | ND |
2016 | ND | 6 | 0 | ND |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 3 | 0 | ND |
2019 | ND | 12 | 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 |
---|---|---|
2014-03-05 | 140305086-1 | ND |
2014-06-02 | 140603014-1 | ND |
2015-02-25 | 150226031-1 | ND |
2015-06-04 | 150605032-1 | ND |
2016-03-10 | 160311016-2 | ND |
2016-03-10 | 160311016-1 | ND |
2016-03-10 | 160311016-3 | ND |
2016-06-09 | 160610003-2 | ND |
2016-06-09 | 160610003-1 | ND |
2016-08-31 | 160901038-1 | ND |
2018-03-27 | 180328027-1 | ND |
2018-06-04 | 180605008-001 | ND |
2018-07-03 | 1807-00035-1S | ND |
2019-06-03 | 20106578001_ISOC | ND |
2019-06-03 | 20106578002_ISOC | ND |
2019-06-03 | 20106578003_ISOC | ND |
2019-07-29 | 20114781002_ISOC | ND |
2019-07-29 | 20114781001_ISOC | ND |
2019-07-29 | 20114781001_ISOC | ND |
2019-07-29 | 20114781002_ISOC | ND |
2019-07-29 | 20114781003_ISOC | ND |
2019-07-29 | 20114781003_ISOC | ND |
2019-07-29 | 20114781004_ISOC | ND |
2019-07-29 | 20114781004_ISOC | ND |
2019-10-17 | 20126579001_ISOC | ND |