Earthquake threats to California's water

A magnitude-7.8 earthquake on the San Andreas fault could cut off Los Angeles from all three major aqueducts that supply 88% of its water. Water agencies in the San Francisco area have made seismic upgrades to the Hetch Hetchy and Mokelumne aqueducts.

Graphics reporting by Rong-Gong Lin II and Rosanna Xia

Source: California Department of Water Resources, California Geological Survey and U.S. Geological Survey

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