2,4,5-TP (Silvex)
City of Kerrville
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.
22
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 | 5 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 1 | 0 | ND |
| 2017 | ND | 12 | 0 | ND |
| 2018 | ND | 3 | 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 |
|---|---|---|
| 2014-04-07 | AC49530 | ND |
| 2014-04-07 | AC49531 | ND |
| 2014-07-16 | AC59858 | ND |
| 2014-10-15 | AC69753 | ND |
| 2014-10-15 | AC69754 | ND |
| 2016-02-01 | AD21211 | ND |
| 2017-04-06 | AD78785 | ND |
| 2017-05-08 | AD83154 | ND |
| 2017-05-08 | AD83157 | ND |
| 2017-05-09 | AD83421 | ND |
| 2017-05-09 | AD83416 | ND |
| 2017-05-09 | AD83420 | ND |
| 2017-05-22 | AD85094 | ND |
| 2017-07-05 | AD88360 | ND |
| 2017-07-05 | AD88359 | ND |
| 2017-07-05 | AD88358 | ND |
| 2017-10-09 | AD99895 | ND |
| 2017-10-09 | AD99896 | ND |
| 2018-01-08 | AE08161 | ND |
| 2018-01-08 | AE08167 | ND |
| 2018-03-22 | AE19718 | ND |
| 2019-04-08 | AE61467 | ND |