An Area of Concern (AOC) is a geographic area within the Great Lakes where severe degradation of the environment has occurred due to human activities.

Learn about the Canadian Great Lakes’ Areas of Concern and the collective actions to improve water quality through the Remedial Action Plan initiative.

Local Remedial Action Plan teams implement actions to improve the AOCs.

North Shore of Lake Superior
St. Mary’s (Ontario)
St. Clair River
Detroit River (Ontario)
Niagara River (Ontario)
Hamilton Harbour
Toronto and Region
Bay of Quinte
St. Lawrence River (Cornwall/ Akwesasne)