A map from the Environmental Protection Agency showing the location of the Southwest Jefferson County Mining site. An investigation by the EPA is looking into lead contamination resulting from mining at the site long ago.
The Environmental Protection Agency plans to test 256 Jefferson County residential properties amid concerns that lead in the Big River is contaminating soil.
The St. Louis Post-Dispatch reports that testing is expected to be completed by midsummer. Recent studies and samples indicated widespread lead contamination in the flood plain that extends from Leadwood in St. Francois County to the confluence with the Meramec River near Eureka.