Walnut Canyon Reservoir

Walnut Canyon Reservoir is a 920-million-gallon reservoir that supplies water to homes and businesses in Anaheim’s hill and canyon area that recently has undergone a major rehabilitation. We are very appreciative of the patience and understanding demonstrated by our neighbors during the project's planning, design and construction phases. Now that work has been completed and the project rededicated, we look forward to continuing to work closely with surrounding neighbors as operations continue.
Woman sitting on bench at edge of Walnut Canyon Reservoir
The reservoir receives deliveries of imported, untreated Colorado River Water from the Metropolitan Water District (MWD) of Southern California. Water from the reservoir is then treated at the August F. Lenain Treatment Plant prior to delivery to Anaheim Public Utilities' customers. The reservoir is capable of storing 920 million gallons of imported water, enough to supply the area for 30-45 days in the event of an interruption to imported supplies from MWD. It also offers operational flexibility to avoid imported water peaking charges during summer periods of extended hot weather and provides a valuable resource in helping to contain brush fires.
View of Walnut Canyon Reservoir and bluff with houses at top of bluff
Recent Improvements
Constructed in 1968, Walnut Canyon Reservoir and the adjacent dam have served the community for close to 40 years. It is common practice with reservoirs of this type to do more significant rehabilitation work periodically to ensure continued safe performance.
Wide view of Walnut Canyon Reservoir with houses in the distance
The scope of this project included: Replacing the existing reservoir lining system
  • Enhancing public use amenities by:
    • Extending natural landscaping into barren areas
    • Installing interpretive signs
    • Rehabilitating and relocating fencing
  • Improving reservoir water quality by improving our ability to mix water and control algae
  • Repairing the 1.7 mile perimeter road and local drainage system

Updated August 2009.