Auburn, Indiana

Beloit, Wisconsin

Delaware County, Indiana

Elkhart County, Indiana

Elkhorn, Wisconsin

Fort Wayne, Indiana

Germantown, Wisconsin

Glenview, Illinois

Goshen, Indiana

Grand Chute Menasha Sewerage Commission

Great Lakes Commission

Greencastle, Indiana

Greenfield, Indiana

Hartford City, Indiana

Indiana Department of Environmental Management

Indiana Finance Authority

Indianapolis, Indiana

Iowa Comprehensive Underground Storage Tank Fund Board

Milwaukee County Department of Public Works

Milwaukee Metropolitan Sewerage District

Milwaukee, Wisconsin

Muncie, Indiana

Muscatine , Iowa

Peoria, Illinois

Richmond, Indiana

Rock Island, Illinois

South Bend, Indiana

U.S. EPA Office of Inspector General – Engineering & Science Branch Unit of Audit

Warsaw, Indiana

West Allis, Wisconsin