2,4,5-TP (Silvex)

Coachella Valley Water District: Cove Community

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	10	ND
2015	ND	3	ND
2016	ND	1	ND
2017	ND	1	ND
2018	ND	5	ND
2019	ND	10	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
2014-05-05	4790-279-1236	ND
2014-06-13	4790-032-0951	ND
2014-06-13	4790-199-0900	ND
2014-06-13	4790-030-1033	ND
2014-06-13	4790-084-0721	ND
2014-06-13	4790-103-0800	ND
2014-06-13	4790-105-0845	ND
2014-06-13	4790-117-0954	ND
2014-06-13	4790-129-0904	ND
2014-06-13	4790-134-1002	ND
2015-06-16	4790-279-1034	ND
2015-09-15	4790-279-0930	ND
2015-12-02	4790-279-1100	ND
2016-03-23	9590-279-1010	ND
2017-01-23	9590-224-1045	ND
2018-04-25	9590-281-1145	ND
2018-07-25	9590-281-1045	ND
2018-09-26	9590-282-1140	ND
2018-10-23	9590-281-1300	ND
2018-12-12	9590-282-1155	ND
2019-01-31	9590-281-0950	ND
2019-03-06	9590-224-1017	ND
2019-03-19	9590-282-1035	ND
2019-05-22	9590-286-0836	ND
2019-06-21	9590-282-1130	ND
2019-06-21	9590-224-0840	ND
2019-07-03	9590-289-0800	ND
2019-08-29	9590-286-1240	ND
2019-09-26	9590-224-1100	ND
2019-12-23	9590-289-0920	ND