The Great Lakes Commission (GLC) is an interstate compact agency created by the eight Great Lakes states in 1955 via the Great Lakes Basin Compact to ensure the protection of the Great Lakes. In 1968, Congress provided its consent to the Compact and the interstate compact agency it created. The eight U.S. states and two Canadian provinces are represented on the nonpartisan GLC by a delegation of government-appointed commissioners. The Canadian provinces of Ontario and Québec joined the Commission as associate members via a Declaration of Partnership in 1999.
The GLC recommends policies and practices to balance the use, development, and conservation of the water resources of the Great Lakes and brings the region together to work on issues that no single community, state, province, or nation can tackle alone.