Superfund Site Profile
The Washington County Lead District – Old Mines Site includes soil and groundwater contaminated with arsenic, barium, cadmium and lead associated with historical mining practices in southeast Missouri. The site encompasses about 90 square miles in the northeastern portion of Washington County, Missouri. Remnants of mining activities throughout the area include strip mines, mineshafts, mine dumps, tailing areas, tailings ponds and associated dams. There are several large tailings impoundments, associated dams and leachate ponds with elevated levels of lead present at the site. Site investigations and cleanup are ongoing.