Surface Water Reservoirs and Rainfall Enhance Water Reliability

Across the region, two dozen reservoirs serve a variety of purposes, including storing imported water and capturing rainfall. Semi-arid San Diego County gets just 10 inches of rain at the official weather station at Lindbergh Field, but more than twice as much in the mountains. 

Runoff from seven watersheds in the county supplies 24 reservoirs with a combined capacity of about 723,000 acre-feet. In addition, the region’s ratepayers have invested in reservoirs owned by the Metropolitan Water District of Southern California, and the Water Authority is seeking a storage account in Lake Mead as a low-cost way to increase reserves and provide water to the drought-stricken reservoir.

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Historical Data

aerial of a reservoir
Reservoirs

Across the region, two dozen reservoirs serve a variety of purposes, including storing imported water and capturing rainfall.

rain droplots running off a leaf
Rainfall

Semi-arid San Diego County gets just 10 inches of rain at the official weather station at Lindbergh Field, but more than twice as much in the mountains.