• Colorado Springs Utilities
  
• Town of Georgetown
• City and County of Denver 
  
• Town of Ault
  
• City of Aurora
  
• Town of Nederland
• Village of Taos Ski Valley
• Eagle River Water & Sanitation District
• Town of Bayfield
• City of Alamosa
• City of Delta 
• Town of Dillon
• Pine Brook Water District
  
• City of Durango
• Monarch Mountain Ski Area
• North Table Mountain Water & Sanitation District
• City of Boulder
• New Mexico State Parks
• City of Idaho Springs
• Leprino Foods
• City of Cortez
• Lookout Mountain Water District
• City of Loveland
• Meeker Sanitation District
• Tabernash Water & Sanitation District
  
• Town of Wellington
• Climax Molybdenum Company
• Hamilton Creek Metropolitan District
• Prospect Mountain Water Company
• Ute Lake Water & Sanitation District
• United Water & Sanitation District
• William MRK Developers
• Camp Santa Maria

• Town of Lyons
  
• Mt. Crested Butte Water & Sanitation District
• Town of Crested Butte
• Town of Frisco
  
• City of Dacono
  
• Saint Vrain Sanitation District
  
• National Park Service - Mesa Verde National Park
• Town of Estes Park
• Pagosa Area Water & Sanitation District
  
• City & County of Broomfield
• Town of Milliken
• Southside Mutual Domestic Water Association
• Town of Bennett
• Gateway Village
• Lumberton Mutual Domestic Water Consumers Association
• Colorado Department of Transportation
• Noble Energy
• Platte Valley Irrigation Company
• St. Mary's Glacier Water & Sanitation District
• Southern Ute Utilities Division
• Town of Windsor
• San Juan River Village Metropolitan District
• Briggsdale Water Company
• Eldorado Springs
• Town of Kersey
• Town of Erie
• East Larimer County Water District / Fort Collins - Loveland Water District / North Weld County Water District
• Woodmoor Water & Sanitation District