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Walnut Canyon Reservoir

Important Water Storage for Anaheim Homes and Businesses



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 phase. Now that work has been completed and the project rededicated, we look forward to continuing to work closely with surrounding neighbors as operations continue.

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. Capable of storing 920 million gallons of imported water, enough to supply the area for 30 to 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.

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. The scope of this project included:
 • Replacing the existing reservoir lining system;
     • 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; and
     • Enhancing public-use amenities by rehabilitating and relocating fencing, extending natural landscaping into
       barren areas and installing interpretive signs.

August, 2009