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Sierra Mountains
photo courtesy DWR
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Upstream Diversions Impact
the Delta
The Sacramento - San Joaquin Delta is part of a 75,000 square mile watershed with many rivers which ultimately flow out into San Francisco Bay. The two largest rivers within the watershed, the Sacramento and San Joaquin, are fed by many tributary rivers including the Tuolumne and Mokelumne Rivers.
Millions of Californians rely on drinking water from these Delta tributary rivers.
The Sierra's Tuolumne River provides 85% of the water supply delivered by the San Francisco Public Utilities Commission (SFPUC) to 2.6 Million Bay Area residents.
The Sierra's Mokelumne River provides 90% of source water for the East Bay Municipal Water District (EBMUD) to deliver water to 1.39 million Bay Area residents. (EBMUD UWMP pg. 6)
Water from the Sierra is a precious resource that supplies most of the people, businesses and farms in California.
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