2,4,5-TP (Silvex)
St John Water District 1
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.
24
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 | 4 | 0 | ND |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 4 | 0 | ND |
| 2018 | ND | 6 | 0 | ND |
| 2019 | ND | 4 | 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 |
|---|---|---|
| 2014-01-22 | AD88499 | ND |
| 2014-01-22 | AD88499 | ND |
| 2015-04-06 | 35182606003 | ND |
| 2015-04-06 | 35182606003 | ND |
| 2015-10-08 | 35211172003 | ND |
| 2015-10-08 | 35211172003 | ND |
| 2016-02-23 | 35231304005 | ND |
| 2016-02-23 | 35231304005 | ND |
| 2016-09-20 | 35266509007 | ND |
| 2016-09-20 | 35266509007 | ND |
| 2017-01-25 | 35291206002 | ND |
| 2017-01-25 | 35291206002 | ND |
| 2017-10-18 | 35343087005 | ND |
| 2017-10-18 | 35343087005 | ND |
| 2018-01-23 | 35370117004 | ND |
| 2018-01-23 | 35370117004 | ND |
| 2018-05-14 | 35392327001 | ND |
| 2018-05-14 | 35392327001 | ND |
| 2018-07-17 | 35405084001 | ND |
| 2018-07-17 | 35405084001 | ND |
| 2019-01-22 | 35444040001 | ND |
| 2019-01-22 | 35444040001 | ND |
| 2019-07-25 | 35485228001 | ND |
| 2019-07-25 | 35485228001 | ND |