2,4,5-TP (Silvex)
City of Pasadena
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 | 4 | 0 | ND |
2015 | N/A | 0 | 0 | N/A |
2016 | ND | 2 | 0 | ND |
2017 | ND | 10 | 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 |
---|---|---|
2014-03-06 | AC46015 | ND |
2014-03-06 | AC46016 | ND |
2014-03-06 | AC46017 | ND |
2014-04-24 | AC51747 | ND |
2016-04-06 | AD32159 | ND |
2016-07-06 | AD43207 | ND |
2017-01-10 | AD64092 | ND |
2017-03-16 | AD75536 | ND |
2017-03-16 | AD75537 | ND |
2017-03-16 | AD75539 | ND |
2017-03-16 | AD75535 | ND |
2017-03-16 | AD75538 | ND |
2017-04-04 | AD78364 | ND |
2017-07-11 | AD88944 | ND |
2017-09-18 | AD96581 | ND |
2017-10-31 | AE03022 | ND |