Walnut Canyon Reservoir is a 920-million-gallon reservoir that supplies water to Anaheim homes and businesses.
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.
Walnut Canyon Reservoir provides operational flexibility to minimize imported water peaking charges during summer periods, which results in fluctuations of water levels. Additionally, when groundwater wells that serve the majority of Anaheim are offline for upgrades, the reservoir is relied upon to serve customers that may cause lower water levels.
