Northeast Ohio Regional Sewer District

City of Baltimore, Maryland

Clayton County Water Authority, Georgia

City of Cincinnati, Ohio

Hampton Roads Sanitation District, Virginia

Washington Suburban Sanitation District, Maryland

Milwaukee MSD, Wisconsin

St. Louis MSD, Missouri

PRASA, Puerto Rico

Pierce County Public Works, Tacoma, Washington

Nassau County Public Works, New York

City of Columbus, Ohio

City of Little Rock, Arkansas

Inland Empire Utilities Authority, California

United States Air Force

United States Army

United States Marines

NASA

IUnited States Navy