San Joaquin Reservoir

San Joaquin Reservoir

SJ ResSan Joaquin Reservoir was built in 1966 and was originally used as a drinking water reservoir by seven cities and water districts. However, after the enactment of more stringent water quality regulations that prohibited storage of drinking water in an open reservoir, the facility was drained and sat empty from 1994 until 2005.

After drainage of the facility, the neighbors expressed a desire to restore a water view and in 2001, IRWD proposed purchasing the reservoir from the joint owners and converting the reservoir to store recycled water. Because recycled water is used for irrigation and not for drinking, it can be safely stored in an open reservoir without a cover. Work to convert the reservoir began in 2004 and took approximately one year to complete. Water began flowing into the new recycled water reservoir in December 2004 and its re-dedication ceremony was held in February 2005.
 
This recycled water reservoir provides 3,080 acre feet (nearly one billion gallons) of seasonal storage for recycled water. Operation of the reservoir maximizes storage during the winter months when irrigation demands are lower. Water is then withdrawn from the reservoir in the summer months to provide landscape irrigation water for Irvine, Newport Coast and portions of the city of Newport Beach.

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