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.
13
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 | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 3 | 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 |
|---|---|---|
| 2014-02-18 | 14020225-004 | ND |
| 2014-08-19 | 14080292-004 | ND |
| 2015-02-17 | 15020219-004 | ND |
| 2015-08-25 | 15080461-004 | ND |
| 2016-02-08 | 16020070-004 | ND |
| 2016-08-09 | S1602398001 | ND |
| 2017-02-13 | S1701131001 | ND |
| 2017-08-14 | S1701202001 | ND |
| 2018-02-06 | S1705770001 | ND |
| 2018-08-07 | S1801120001 | ND |
| 2019-02-19 | S1805456001 | ND |
| 2019-02-19 | S1805456001 | ND |
| 2019-10-29 | S1953596001 | ND |