Won’t Delta levees collapse in an earthquake, stopping the flow of freshwater needed by users in other parts of California?

The western edge of the Delta is 30 miles from the nearest active fault, the Hayward Fault.  Most Bay Area earthquake threat is associated with faults on the Peninsula or in the North Bay, which are even farther from the majority of Delta levees.  No Delta levee has ever failed in an earthquake, even before recent improvements that have brought levees to a high engineering standard.  The likelihood of earthquakes interrupting water deliveries is much greater along the California Aqueduct, which crosses blind thrust faults on the western side of the San Joaquin Valley, or in urban areas in the Bay Area and Southern California.  The best defense against interruptions in water deliveries is increased investment in local water systems.