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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	2	ND
2015	ND	2	ND
2016	N/A	0	N/A
2017	ND	3	ND
2018	ND	14	ND
2019	ND	11	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