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D3.1 City of Columbus Categorical Water use <br />Unlike the five cities, the City of Columbus has much higher commercial, industrial and institutional <br />water use than most cities. Demand is generated by a few of major users and very few residential users <br />are connected to the city's water system. Figure D3.2 shows categorical water use for the City of <br />Columbus. <br />2013 Columbus Water Sold by Category <br />Unaccounted <br />Residential <br />Figure D3.2 Categorical water use for the City of Columbus <br />D3.2 Major Water Users <br />A major user is considered a customer which uses greater than 5% of the water sold. As a joint system, <br />major water users would account for less than 1 % of use. The City of Columbus presents an unusual <br />circumstance as most of the city's demand comes from commercial/industrial use—the two most <br />important consumers being Running Aces Harness Track and Ziegler, Inc. Together, these two users <br />accounted for 66% of use. <br />D4 Water Treatment <br />Since each City's water supply comes from groundwater wells, the six cities have similar raw water <br />quality characteristics with the primary issue being iron and manganese. The City of Circle Pines is the <br />only city which operates a treatment plant for iron and manganese removal. However, the City of <br />Lexington receives treated water from Blaine during most of the year. <br />Joint water Utility Feasibility Study D-4 <br />