Official Web Site of the City of Phoenix

National Organizations

• U.S. Fish and Wildlife Service
• Environmental Protection Agency (EPA)
• U.S. Army Corps of Engineers
• U.S. Bureau of Reclamation (BOR)
  

Statewide Organizations

• Arizona Municipal Water Users Association
• Arizona Department of Environmental Quality
• Arizona State University
• Arizona Game and Fish Department
• Arizona Department of Health Services
• Arizona Department of Water Resources

County Organizations

• Flood Control District of Maricopa County
• Maricopa County Environmental Services Department
  

Birding Organizations

• Sonoran Audubon Society
• Maricopa Audubon Society
• Birding.com
  

Cities (Those of the Sub-Regional Operating Group that own and operate Tres Rios)

• City of Glendale
• City of Mesa
• City of Phoenix
• City of Scottsdale
• City of Tempe