2,4,5-TP (Silvex)
Irvine Ranch Water District
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.
21
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 |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | ND | 3 | 0 | ND |
| 2015 | ND | 6 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 4 | 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 |
|---|---|---|
| 2014-01-14 | 4417-067-1010 | ND |
| 2014-01-14 | 4417-066-0930 | ND |
| 2014-10-07 | 4417-078-1300 | ND |
| 2015-01-12 | 4417-078-1120 | ND |
| 2015-04-08 | 4417-078-1000 | ND |
| 2015-05-20 | 4417-077-0750 | ND |
| 2015-07-13 | 4417-077-1100 | ND |
| 2015-07-14 | 4417-078-0900 | ND |
| 2015-10-05 | 4417-077-0930 | ND |
| 2016-01-12 | 4417-077-1030 | ND |
| 2016-06-23 | 9588-069-1133 | ND |
| 2016-11-14 | 9588-069-1154 | ND |
| 2017-02-28 | 9588-085-1334 | ND |
| 2017-03-21 | 9588-064-1437 | ND |
| 2017-03-21 | 9588-063-1418 | ND |
| 2017-03-29 | 9588-069-1032 | ND |
| 2018-02-14 | 9588-085-1413 | ND |
| 2018-04-17 | 9588-085-1141 | ND |
| 2019-02-27 | 9588-085-0941 | ND |
| 2019-03-14 | 9588-064-0943 | ND |
| 2019-07-17 | 9588-085-1413 | ND |