Superfund Site: OLMSTED COUNTY SANITARY LANDFILL
ORONOCO, MN

Superfund Site Profile

SITE BACKGROUND

The Olmsted County Sanitary Landfill occupies around 52 acres of a 304-acre property in Olmsted County, Minnesota. The landfill began operating around 1970 and accepted mixed municipal solid waste as well as commercial and industrial solid waste until 1987. In 1987, the landfill closed to all except demolition debris and ash from the Rochester Public Utilities power plant. Final closure of the landfill began in 1993. Waste disposal operations contaminated groundwater with hazardous chemicals. Following cleanup, EPA took the site off the Superfund program’s National Priorities List (NPL) in 1995. Operation and maintenance activities are ongoing by the Minnesota Pollution Control Agency (MPCA) Closed Landfill Program.