2,4,5-TP (Silvex)
City of Nampa
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 | N/A | 0 | 0 | N/A |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 7 | 0 | ND |
2017 | ND | 5 | 0 | ND |
2018 | ND | 1 | 0 | ND |
2019 | ND | 12 | 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 |
---|---|---|
2016-04-20 | S1616221 | ND |
2016-07-20 | S1632285 | ND |
2016-10-07 | S1646180 | ND |
2016-11-17 | 1652977 | ND |
2016-11-17 | S1652977 | ND |
2016-11-17 | S1652993 | ND |
2016-11-17 | S1652982 | ND |
2017-01-31 | S1703805 | ND |
2017-01-31 | S1703804 | ND |
2017-04-11 | S1714411 | ND |
2017-08-09 | S1735777 | ND |
2017-10-18 | S1748770 | ND |
2018-10-08 | S1850028 | ND |
2019-08-15 | S1940600 | ND |
2019-08-15 | S1940599 | ND |
2019-09-17 | S1946663 | ND |
2019-09-17 | S1946664 | ND |
2019-09-17 | S1946665 | ND |
2019-09-17 | S1946666 | ND |
2019-09-17 | S1946661 | ND |
2019-09-18 | S1947017 | ND |
2019-09-18 | S1947010 | ND |
2019-09-18 | S1947008 | ND |
2019-09-18 | S1947009 | ND |
2019-09-18 | S1947007 | ND |