2,4,5-TP (Silvex)
Stillwater
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.
39
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 | 6 | 0 | ND |
| 2015 | ND | 10 | 0 | ND |
| 2016 | ND | 9 | 0 | ND |
| 2017 | ND | 14 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 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 |
|---|---|---|
| 2014-11-06 | 14K0287-02 | ND |
| 2014-11-06 | 14K0287-03 | ND |
| 2014-11-06 | 14K0287-04 | ND |
| 2014-11-06 | 14K0290-02 | ND |
| 2014-11-06 | 14K0290-03 | ND |
| 2014-11-06 | 14K0287-01 | ND |
| 2015-02-25 | 15B1197-03 | ND |
| 2015-02-25 | 15B1197-04 | ND |
| 2015-02-25 | 15B1197-02 | ND |
| 2015-02-25 | 15B1197-01 | ND |
| 2015-02-25 | 15B1195-04 | ND |
| 2015-02-25 | 15B1195-03 | ND |
| 2015-02-25 | 15B1195-02 | ND |
| 2015-02-25 | 15B1195-01 | ND |
| 2015-04-14 | 15D0885-01 | ND |
| 2015-04-14 | 15D0885-02 | ND |
| 2016-04-06 | 3426228 | ND |
| 2016-04-06 | 3426217 | ND |
| 2016-04-06 | 3426176 | ND |
| 2016-04-06 | 3426167 | ND |
| 2016-04-06 | 3426140 | ND |
| 2016-04-06 | 3426105 | ND |
| 2016-07-12 | 3491823 | ND |
| 2016-07-12 | 3491774 | ND |
| 2016-07-12 | 3491715 | ND |
| 2017-02-08 | 17B0418-03 | ND |
| 2017-02-08 | 17B0418-02 | ND |
| 2017-02-08 | 17B0418-01 | ND |
| 2017-02-08 | 17B0417-03 | ND |
| 2017-02-08 | 17B0417-02 | ND |
| 2017-02-08 | 17B0417-01 | ND |
| 2017-03-01 | 17C0039-01 | ND |
| 2017-04-17 | 17D0994-03 | ND |
| 2017-04-17 | 17D0994-04 | ND |
| 2017-04-17 | 17D0998-01 | ND |
| 2017-04-17 | 17D0998-02 | ND |
| 2017-04-17 | 17D0998-03 | ND |
| 2017-04-17 | 17D0994-02 | ND |
| 2017-04-17 | 17D0994-01 | ND |