2,4,5-TP (Silvex)

Southwest Ouachita Waterworks Inc.

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	12	ND
2015	ND	2	ND
2016	N/A	0	N/A
2017	ND	14	ND
2018	N/A	0	N/A
2019	N/A	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
2014-06-16	AD92414	ND
2014-06-16	AD92413	ND
2014-06-16	AD92414	ND
2014-06-16	AD92413	ND
2014-10-20	AD98782	ND
2014-10-20	AD98780	ND
2014-10-20	AD98781	ND
2014-10-20	AD98782	ND
2014-10-20	AD98783	ND
2014-10-20	AD98781	ND
2014-10-20	AD98780	ND
2014-10-20	AD98783	ND
2015-01-05	AE00867	ND
2015-01-05	AE00867	ND
2017-06-12	35318592003	ND
2017-06-12	35318592002	ND
2017-06-12	35318592001	ND
2017-06-12	35318592001	ND
2017-06-12	35318592002	ND
2017-06-12	35318592003	ND
2017-10-16	35343270001	ND
2017-10-16	35343270004	ND
2017-10-16	35343270003	ND
2017-10-16	35343270002	ND
2017-10-16	35343270001	ND
2017-10-16	35343270004	ND
2017-10-16	35343270003	ND
2017-10-16	35343270002	ND