2,4,5-TP (Silvex)
Thomas Cove
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 | ND | 2 | 0 | ND |
| 2015 | ND | 2 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 2 | 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 |
|---|---|---|
| 2014-09-30 | L5153605-1 515 | ND |
| 2014-10-21 | L5242402-1 515 | ND |
| 2015-03-26 | L5486345-515 | ND |
| 2015-05-04 | L5530433-1-515 | ND |
| 2016-09-23 | L6372174-515 | ND |
| 2016-09-23 | L6372290-515 | ND |
| 2017-02-17 | L6568639-1 515 | ND |
| 2017-02-17 | L6635059-1 515 | ND |
| 2018-03-28 | 8030875-01 515 | ND |
| 2018-03-28 | 8030880-01 515 | ND |
| 2019-06-25 | 9055333-01 515 | ND |
| 2019-06-25 | 9055337-01 515 | ND |