Texas River Authorities and Water Districts

• Canadian River Municipal Water Authority
• Brazos River Authority
• Edwards Aquifer Authority (EAA)  
• Lower Colorado River Authority
• Red River Authority (Red & Canadian Rivers)
• Sabine River Authority
• San Antonio River Authority (SARA)
• San Antonio Water System (SAWS)
• Trinity River Authority
• Upper Guadalupe River Authority

Texas State Agencies

• Texas Commission on Environmental Quality (TCEQ)
• Texas Parks & Wildlife Department (TPWD)
• Texas Water Development Board (TWDB)

Federal Agencies

• U.S. Environmental Protection Agency - Surf Your Watershed
• United States Geological Survey (USGS)
• National Park Service - Nationwide Rivers Inventory (NRI)