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<br />Residential demand accounts for nearly 67 percent of annual water use in Aurora. Commercial <br />customers account for nearly 20 percent of total annual demand. A summary of annual demand <br />by general customer class categories is presented in Table 5. <br /> <br />Table 5: Summarized annual demand by general customer class, Aurora Water <br />2005-06 A vg. <br />(kgal) <br />7,072,725 <br />4,166,047 <br />3,340,594 <br />216,682 <br />730,447 <br />1,359,182 <br />16,885,678 <br /> <br />General Class <br />Single Family <br />Multi-Family <br />Commercial, Industrial, Institutional <br />Irrigation <br />Municipal <br />Other <br />TOTAL <br /> <br />0/0 of Total <br />41.9% <br />24.7% <br />19.8% <br />1.3% <br />4.3% <br />8.0% <br />100.00/0 <br /> <br />Single-Family Demand and Conservation Potential <br />As part of the EPA New Home Benchmarl<ing Study that Aurora is participating in, Aquacraft <br />obtained historic billing records for single family residential customers in Aurora as well as <br />demographic and survey response data. A sample of 1,000 single-family homes built before <br />2001 was selected along with a second sample of 1,000 homes built during and after 2001. <br /> <br />As shown in Table 6, the new homes in Aurora use approximately 4 kgal more per year than <br />existing housing stock (prior to 2001). However, new homes appear to be using approximately 7 <br />kgal per year less indoors, which is lil<ely the result of more efficient plumbing fixtures in the <br />new homes. <br /> <br />According to the US Census Bureau, the average household size in Aurora is 2.62 persons per <br />dwelling unit (this includes both single-family and multi-family housing). Assuming the 2.62 <br />number is a reasonable estimate, then the pre-2001 Aurora homes are using an estimated 66.5 <br />gallons per capita per day (gpcd) indoors and the post-2001Aurora homes are using an estimated <br />58.9 gpcd. <br /> <br />Studies conducted for the US EPA by Aquacraft2 have shown that the installation of high- <br />efficiency toilets, high-efficiency clothes washers, and low-flow bathroom faucet aerators can <br />reduce residential indoor per capita use to 40 gpcd (or less). This suggests that the indoor <br />conservation potential of the existing housing stock is 26.5 gpcd (40%) and the conservation <br /> <br />2 DeOreo, W.B., P.W. Mayer, and D.M. Lewis. 2000. Seattle Home Water Conservation Study. Boulder, CO: <br />Aquacraft, Inc. <br /> <br />DeOreo, W.B., P.W. Mayer, E.L.Towler, and D.M.Lewis. 2003. Residential Indoor Water Conservation Study: <br />Evaluation of High Efficiency Indoor Plumbing Fixture Retrofits in Single- Falnily Homes in the East Bay <br />Municipal Utility District Service Area. Boulder, CO: Aquacraft, Inc. <br /> <br />DeOreo, W.B., P.W. Mayer, E.L Towler, and L.A. Martien. 2004. Tampa Water Department Residential Water <br />Conservation Study. Boulder, CO: Aquacraft, Inc. <br /> <br />8 <br />