EPA Superfund Site

MADISON COUNTY MINES

MO | EPA ID MOD098633415

About this site’s exposure pathways: As of June 2025, the Madison County Mines site is considered 'Current Human Exposure Not Under Control'. The Baseline Human Health Risk Assessment for the Wide Area Remedial Investigation of the Madison County Mines Site (Syracuse Research Center, July 2007) documented potential human health risk from exposure to metals, primarily lead but including antimony, arsenic, cobalt, manganese, nickel, iron and zinc in residential soils, groundwater at mine/tailings areas, from all terrain vehicle use near mine areas, exposure to contaminated sediments and consumption of contaminated fish in some areas. Lead-contaminated residential yard cleanups began in 2000 and are ongoing, 2,100 properties have been remediated for high levels of lead in soil; several mine waste piles have been addressed and others are in the Remedial Investigation phase and remain to be addressed; some creek, river and lake sediments and floodplains are still contaminated. The EPA is developing a watershed model for the Little Saint Francis River as part of the RI activities to support long-term remedial action for the overall watershed. EPA is also performing an RI/FS, projected completion 2026, to further characterize and determine an appropriate remedy. Community involvement at the site currently occurs in the form of a quarterly, open round table meeting between federal, state, and local officials, as well as any interested members of the public.