2,4,5-TP (Silvex)
Hampstead Area Water
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 | 2 | 0 | ND |
2015 | ND | 2 | 0 | ND |
2016 | N/A | 0 | 0 | N/A |
2017 | ND | 3 | 0 | ND |
2018 | ND | 14 | 0 | ND |
2019 | ND | 11 | 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 |
---|---|---|
2014-06-12 | 3406-1033 | ND |
2014-11-20 | 3411-1491 | ND |
2015-02-18 | 3502-994 | ND |
2015-04-21 | 3504-2161 | ND |
2017-08-09 | 3708-972-1 | ND |
2017-08-09 | 3708-963-1 | ND |
2017-10-12 | 117101156 | ND |
2018-02-21 | 118021712.01 | ND |
2018-04-04 | 118040387.01 | ND |
2018-04-04 | 118040383.01 | ND |
2018-05-23 | 118052863.01 | ND |
2018-05-23 | 118052870.01 | ND |
2018-05-23 | 118052866.01 | ND |
2018-05-23 | 118052855.01 | ND |
2018-05-23 | 118052852.01 | ND |
2018-05-23 | 118052849.01 | ND |
2018-05-23 | 118052859.01 | ND |
2018-07-13 | 118071315.01 | ND |
2018-07-13 | 118071331.01 | ND |
2018-08-16 | 1180818291 | ND |
2018-11-13 | 118111192.01 | ND |
2019-01-22 | 119011817.01 | ND |
2019-05-15 | 119051888.01 | ND |
2019-05-15 | 119051896.01 | ND |
2019-05-20 | 119052507.01 | ND |
2019-05-20 | 119052514.01 | ND |
2019-05-20 | 119052525.01 | ND |
2019-05-20 | 119052497.01 | ND |
2019-05-20 | 119052488.01 | ND |
2019-05-21 | 119052539.01 | ND |
2019-07-31 | 119073684.01 | ND |
2019-10-08 | 119101004.01 | ND |