2,4,5-TP (Silvex)
City of Winston-Salem
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.
20
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 5 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 5 | 0 | ND |
| 2018 | ND | 4 | 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 |
|---|---|---|
| 2014-01-06 | 8881-010614-EP2S | ND |
| 2014-01-06 | 8881-010614-EP3S | ND |
| 2014-01-06 | 8881-010614-EP1S | ND |
| 2014-05-05 | 8881-050514-EP2S | ND |
| 2014-05-05 | 8881-050514-EP3S | ND |
| 2015-02-02 | ND | |
| 2015-02-02 | ND | |
| 2015-04-13 | ND | |
| 2016-01-11 | 8881-011116-EP1S | ND |
| 2016-01-11 | 8881-011116-EP3S | ND |
| 2017-01-23 | 8881-012317-EP1S | ND |
| 2017-01-23 | 8881-012317-EP3S | ND |
| 2017-01-23 | 8881-012317-EP2S | ND |
| 2017-05-15 | 8881-051517-EP2S | ND |
| 2017-05-15 | 8881-051517-EP3S | ND |
| 2018-01-22 | 8881-012218-EP1S | ND |
| 2018-04-02 | 8881-040218-EP1S | ND |
| 2018-04-02 | 8881-040218-EP2S | ND |
| 2018-04-02 | 8881-040218-EP3S | ND |
| 2019-01-07 | 8881-010719-EP1S | ND |