From the Orange County Register:
“The next earthquake to strike near San Francisco could siphon the flow of drinking water to Orange County for years.
“It doesn’t have to be a huge earthquake – a magnitude 6.0 or more. It just has to hit near a labyrinth of lakes and channels carved out of Northern California between the San Joaquin and Sacramento Rivers, where most people take their boats for the weekend and farmers work the sandy soils on a series of islands that dot the channels of fresh water. It also provides much of the fresh water for Irvine, and nearly all of what people drink in cities to the south, such as San Clemente and Laguna Beach.”