2,4,5-TP (Silvex)

Town of Greenwood Water System

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	8	ND
2015	ND	4	ND
2016	ND	2	ND
2017	ND	4	ND
2018	ND	4	ND
2019	ND	4	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
2014-04-07	AD90461	ND
2014-04-07	AD90461	ND
2014-06-16	AD92363	ND
2014-06-16	AD92364	ND
2014-06-16	AD92365	ND
2014-06-16	AD92365	ND
2014-06-16	AD92364	ND
2014-06-16	AD92363	ND
2015-03-23	35181011005	ND
2015-03-23	35181011005	ND
2015-10-19	35212906005	ND
2015-10-19	35212906005	ND
2016-12-08	35282332006	ND
2016-12-08	35282332006	ND
2017-04-17	35307223003	ND
2017-04-17	35307223003	ND
2017-10-04	35341216002	ND
2017-10-04	35341216002	ND
2018-01-08	35367517001	ND
2018-01-08	35367517001	ND
2018-07-23	35407298001	ND
2018-07-23	35407298001	ND
2019-02-21	35449632001	ND
2019-02-21	35449632001	ND
2019-07-25	35485235001	ND
2019-07-25	35485235001	ND