2,4,5-TP (Silvex)
Concord Water System
NOTE: Concord Water System purchases water from Marion Water System which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Marion Water System.
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.
Samples
Samples exceeding legal limit (MCL)
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 | N/A | 0 | 0 | N/A |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 4 | 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
NOTE: Concord Water System purchases water from Marion Water System which is required to test for 2,4,5-tp (silvex). Sample information shown below was taken by Marion Water System.
| Date | Lab ID | Result |
|---|---|---|
| 2014-11-17 | AD99768 | ND |
| 2014-11-17 | AD99768 | ND |
| 2015-08-24 | 35204447002 | ND |
| 2015-08-24 | 35204447002 | ND |
| 2017-11-06 | 35346863001 | ND |
| 2017-11-06 | 35346863001 | ND |
| 2018-05-14 | 35392913003 | ND |
| 2018-05-14 | 35392913003 | ND |