Greater Cincinnati Water Works supplies water from two sources:

• The Miller Treatment Plant treats surface water from the Ohio River and supplies 88% of drinking water to GCWW's customers, including most of the City of Cincinnati.

• The Bolton Treatment Plant treats groundwater from ten wells in the Great Miami Aquifer. It is located in southern Butler County. Our aquifer (buried sand and gravel filled with water) is 150-200 feet deep and two miles wide. Bolton Plant supplies about 12% of GCWW water.

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