2,4,5-TP (Silvex)
UC - Davis
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.
16
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 | 9 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | N/A | 0 | 0 | N/A |
| 2017 | N/A | 0 | 0 | N/A |
| 2018 | ND | 6 | 0 | ND |
| 2019 | N/A | 0 | 0 | N/A |
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 |
|---|---|---|
| 2014-03-25 | 5810-026-1050 | ND |
| 2014-05-20 | 5810-026-0650 | ND |
| 2014-09-04 | 5810-026-0900 | ND |
| 2014-12-09 | 5810-001-1030 | ND |
| 2014-12-09 | 5810-002-0930 | ND |
| 2014-12-09 | 5810-004-1115 | ND |
| 2014-12-09 | 5810-015-0840 | ND |
| 2014-12-09 | 5810-016-1200 | ND |
| 2014-12-18 | 5810-011-1300 | ND |
| 2015-02-19 | 5810-014-1030 | ND |
| 2018-12-04 | 5810-001-1015 | ND |
| 2018-12-04 | 5810-002-1050 | ND |
| 2018-12-04 | 5810-004-1130 | ND |
| 2018-12-04 | 5810-014-0920 | ND |
| 2018-12-04 | 5810-015-1230 | ND |
| 2018-12-04 | 5810-026-1200 | ND |