2,4,5-TP (Silvex)
Castaic Lake Water Agency
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 | ND | 4 | 0 | ND |
2016 | ND | 3 | 0 | ND |
2017 | ND | 4 | 0 | ND |
2018 | ND | 4 | 0 | ND |
2019 | ND | 3 | 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 |
---|---|---|
2014-07-30 | 9588-006-0930 | ND |
2014-07-30 | 9588-005-0830 | ND |
2014-11-21 | 9588-004-1155 | ND |
2014-11-25 | 9588-005-1345 | ND |
2015-01-14 | 9588-004-1220 | ND |
2015-07-23 | 9590-004-0750 | ND |
2015-07-23 | 9590-006-0940 | ND |
2015-07-23 | 9590-005-0840 | ND |
2016-07-20 | 9590-005-1115 | ND |
2016-07-20 | 9590-006-1215 | ND |
2016-07-20 | 9590-004-1035 | ND |
2017-07-26 | 9590-005-1300 | ND |
2017-07-26 | 9590-006-1405 | ND |
2017-07-26 | 9590-004-1140 | ND |
2017-11-15 | 9590-005-1115 | ND |
2018-07-25 | 9590-005-1310 | ND |
2018-07-25 | 9590-006-1350 | ND |
2018-07-25 | 9590-004-1230 | ND |
2018-10-11 | 9590-004-1010 | ND |
2019-07-31 | 9590-005-1040 | ND |
2019-07-31 | 9590-004-1000 | ND |
2019-07-31 | 9590-006-1125 | ND |