This data layer identifies Groundwater Areas of Concern in the Minnesota Pollution Control Agency's (MPCA) Closed Landfill Program. It was developed by the MPCA. The Closed Landfill Program works to properly close, monitor, and maintain Minnesota's closed municipal sanitary landfills. The Groundwater Area of Concern is the area surrounding the landfill in which the use of groundwater might be affected by contamination from the landfill. This threat to groundwater can remain long after landfills are closed. Any activities in the vicinity of a closed landfill that are dependent on groundwater need to account for the risk.