Areas of Concern are designated by the International Joint Commission as geographic areas in the Great Lakes basin having severe environmental degredation. There are 43 Areas of Concern with 26 in the United States, 17 in Canada, and five shared by the two countries.
These maps show the location and status of the U.S. AOCs.
- AOCs Status Map (PDF)(1 pg, 4 MB, May 2019)
U.S Great Lakes Areas of Concern (PDF)(1 pg, 124 K,
Map showing progress of the U.S. AOCs.