A regional plan for seismic security

CLICK HERE FOR AN ENLARGED VERSION San Francisco Public Utilities Commission wholesale customers created the Bay Area Water Supply and Conservation Agency in 2003 to weigh in on plans to secure the region's water supply. The agency, whose members serve 1.7 million people, supported the commission's 2002 capital improvement program and is monitoring its implementation.

Eighty-five percent of the drinking water for 2.5 million people comes from Sierra Nevada snowmelt stored in the Hetch Hetchy reservoir, which was created in 1923 by damming the Tuolumne River in Yosemite National Park. Silicon Valley's intense growth in the 1970s, 80s, and 90s added a layer of complexity to seismically retrofitting a system originally built across farmlands and open space. San Francisco's $4.6 billion Water System Improvement Plan is structured to meet supply objectives until 2018 and improve delivery reliability through 2030.

A 17-million-gallon reservoir in Alameda County's Sunol Valley, where three sources of water converge and are treated.

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