2,4,5-TP (Silvex)
Makawao
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.
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 | N/A | 0 | 0 | N/A |
2017 | ND | 8 | 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 |
---|---|---|
2014-03-17 | 201403190885 | ND |
2014-03-17 | 201403190888 | ND |
2014-03-17 | 201403190889 | ND |
2014-03-18 | 201403200528 | ND |
2014-04-29 | 201405010562 | ND |
2014-04-29 | 201405010616 | ND |
2014-04-29 | 201405010665 | ND |
2014-05-01 | 201405050006 | ND |
2017-01-27 | ND | |
2017-01-31 | ND | |
2017-01-31 | ND | |
2017-01-31 | ND | |
2017-09-07 | ND | |
2017-10-25 | ND | |
2017-10-25 | ND | |
2017-10-25 | ND |