2,4,5-TP (Silvex)
Emerald Lake
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.
14
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 | 5 | 0 | ND |
| 2015 | ND | 3 | 0 | ND |
| 2016 | ND | 3 | 0 | ND |
| 2017 | ND | 3 | 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 |
|---|---|---|
| 2014-07-16 | 133667.02 | ND |
| 2014-10-15 | 136900.01 | ND |
| 2014-10-15 | 136900.03 | ND |
| 2014-10-15 | 136900.05 | ND |
| 2014-10-15 | 136900.02 | ND |
| 2015-10-19 | 149265.01 | ND |
| 2015-10-19 | 149265.02 | ND |
| 2015-10-19 | 149265.03 | ND |
| 2016-12-13 | 163860.01 | ND |
| 2016-12-13 | 163860.02 | ND |
| 2016-12-13 | 163860.03 | ND |
| 2017-02-21 | 165820.01 | ND |
| 2017-10-02 | 174061.01 | ND |
| 2017-10-02 | 174061.02 | ND |