What would happen to the water supply if a major earthquake struck the Bay Area? According to the East Bay Municipal District, which supplies water to most of the East Bay, there is a 32 percent chance of a magnitude 7 earthquake occurring along the Hayward Fault in the next 30 years. In a worst-case scenario, the Claremont Tunnel, which runs directly through the Hayward Fault and provides water for 800,000 of EBMUD’s customers, would be out of commission for 6 months.

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