2,4,5-TP (Silvex)
Lafayette Water Works
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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | N/A | 0 | 0 | N/A |
2015 | ND | 5 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | N/A | 0 | 0 | N/A |
2018 | ND | 4 | 0 | ND |
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 |
---|---|---|
2015-06-23 | 3267634RS28-1502 | ND |
2015-06-23 | 342731RS28-1502 | ND |
2015-08-06 | 345814RS-1503 | ND |
2015-08-10 | 346159RS28-1503 | ND |
2015-09-15 | 15091764RS28-150 | ND |
2018-05-01 | 2018051547RS28-1 | ND |
2018-05-01 | 2018051548RS28-1 | ND |
2018-09-18 | 2018092643RS28-1 | ND |
2018-09-19 | 2018092657RS28-1 | ND |