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Because the agency's pumping stations, along the Russian River, are down they're only able to supply 53 million gallons of water a day.
However, customers have been using 60 million gallons a day since Monday, when temperatures began to climb.
Storage tanks are being drained by the spike in demand, and Lake Mendocino, the agency's main source of water, is down to 64 percent of capacity.
They're asking people in Santa Rosa, Windsor, Rohnert Park, Cotati, Petaluma, Sonoma, Valley of The Moon, and northern Marin County to cut back.
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