Colorado River water is considered a renewable resource. Using Colorado River water allows Tucson to preserve finite groundwater supplies.
Tucson utilizes most of its allocation of Colorado River water through the Clearwater Renewable Resource Facility which consists of the Clearwell Reservoir and two major aquifer storage and recovery projects: the Central Avra Valley Storage and Recovery Project (CAVSARP) and the Southern Avra Valley Storage and Recovery Project (SAVSARP).
Tucson’s allocation of Colorado River water is delivered to Tucson via the Central Arizona Project (CAP) canal. That Colorado River water is allowed to sink into the ground and recharge the aquifer in Avra Valley at CAVSARP and SAVSARP where it is stored for future use. It is then pumped to the surface and held in the Clearwell Reservoir before it is delivered to Tucson Water customers.
The Clearwell Reservoir is the largest and one of the most critical reservoirs in Tucson Water’s delivery system. Located near Starr Pass Resort on the west side of Tucson, it holds a volume of 60 million gallons in two separate cells of 30 million gallons each.