2,4,5-TP (Silvex)
California Water Service (CWS) - King City
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.
12
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 | N/A | 0 | 0 | N/A |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 0 | ND |
| 2018 | N/A | 0 | 0 | N/A |
| 2019 | ND | 6 | 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 |
|---|---|---|
| 2016-03-07 | 9590-012-1143 | ND |
| 2016-03-14 | 9590-006-1216 | ND |
| 2016-09-20 | 9590-007-1117 | ND |
| 2017-06-06 | 9590-014-1138 | ND |
| 2017-06-06 | 9590-015-1105 | ND |
| 2017-06-07 | 9590-008-1117 | ND |
| 2019-03-06 | 9590-012-1227 | ND |
| 2019-04-17 | 9590-006-1140 | ND |
| 2019-06-03 | 9590-014-0930 | ND |
| 2019-06-03 | 9590-015-1026 | ND |
| 2019-06-04 | 9590-008-1020 | ND |
| 2019-09-09 | 9590-007-1122 | ND |