San Diego, like all other Southern California cities, is thoroughly dependent on imported water. The meager amount of rainfall and limited watersheds are not enough to supply the area with its demands. Lush landscaping and farming require substantial quantities of water- and money.
The Metropolitan Water District determines where San Diego will receive its water. Currently, about two-thirds of San Diego County’s imports come from the Sacramento-San Joaquin River Delta; while the remainder comes from the Colorado River. Several reservoirs located around the county are part of the overall drinking supply system.
San Diego county's diversification of its water supply
Water conservation has become a large part of San Diego. Efficient usage of current water supplies has led to a big push for development of wastewater irrigation programs and native plants for landscaping.
http://10newsblogs.com/pdf/sdwatersourcesreport.pdf
http://aquafornia.com/where-does-southern-californias-water-come-from
http://www.sdcwa.org/
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