California relies on a network of dams and aqueducts to store and transport water from the primary source areas (e.g., Sierra Nevada mountains and foothills) to usage areas (e.g., Central Valley farms and coastal urban regions). Southern California, in particular, relies on this infrastructure for 60% of its water, with the primary supply aqueducts importing from Owens Valley (eastern Sierra), Colorado River, and the California Bay-Delta Region. In this seminar, the presenter will define the meaning of resilience as applied to water systems. He will provide examples of stressing events in which the subsequent response demonstrated resilience (Los Angeles water system following Northridge earthquake) and did not (communities in New Orleans following Hurricane Katrina). He will then describe seismic threats to California’s water systems and opine upon critical system components with and without suitable resilience.