2,4,5-TP (Silvex)
South Kona
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.
22
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 | 8 | 0 | ND |
| 2015 | N/A | 0 | 0 | N/A |
| 2016 | ND | 4 | 0 | ND |
| 2017 | ND | 8 | 0 | ND |
| 2018 | ND | 1 | 0 | ND |
| 2019 | ND | 1 | 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 |
|---|---|---|
| 2014-03-18 | C14-03-0157A | ND |
| 2014-03-18 | C14-03-0156A | ND |
| 2014-04-15 | C14-04-0151A | ND |
| 2014-04-15 | C14-04-0152A | ND |
| 2014-07-07 | C14-07-0090A | ND |
| 2014-07-07 | C14-07-0091A | ND |
| 2014-10-06 | C14-10-0043A | ND |
| 2014-10-06 | C14-10-0044A | ND |
| 2016-03-07 | ND | |
| 2016-03-07 | ND | |
| 2016-06-13 | ND | |
| 2016-06-13 | ND | |
| 2017-03-14 | ND | |
| 2017-03-14 | ND | |
| 2017-03-14 | ND | |
| 2017-03-14 | ND | |
| 2017-06-19 | ND | |
| 2017-06-19 | ND | |
| 2017-06-19 | ND | |
| 2017-10-11 | ND | |
| 2018-03-19 | C18-03-0128A | ND |
| 2019-03-12 | C19-03-0072A | ND |