Orange County, California, has broken ground on a treatment plant that will take sewage and purify it to the point where it can be used as drinking water.
I don't know the figures for Orange County, but the City of Los Angeles takes in some 600 million gallons per day of water from various sources, and discharges some 400 MGD as sewage. (The remaining 200 MGD evaporate into the air, soak into the water table after being used to water gardens, or escape into the storm drains.)
In LA, recycling sewage would cut the demand for new water by up to two-thirds.
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