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3.0 Current Water Use <br />The following section includes a summary of historical data characterizing water <br />use. <br />3.1 Water Use <br />Description of current water use is meant to be consistent with the International <br />Water Association (IWA) and American Water Works Association (AWWA) Water <br />Balance approach, which was published in 2000 as part of the IWA publication <br />Performance Indicators for Water Supply Services to provide utilities a consistent <br />methodology for assessing water loss. Though the full assessment of a water balance <br />is outside the realm of this report the terminology is consistent. The main categories <br />discussed for the City are revenue (metered) and non - revenue (metered and <br />unmetered) water, which are defined in Figure 2 below. <br />Components of the IWA/AWWA Water Balance <br />All! water supplied by a utiiii #y is accounted for as either a valid consumption or a <br />wasteful loss. <br />Unbi l l e d U n bf l led Metered Consumption <br />Authorized <br />Consumption Unbl led unmetered Consumptic <br />FIGURE 2 <br />IWA /AWWA Water Balance Summary (Source: AWWA Publication, Opflow, October200� <br />Potable water use is sold retail to the following six customer classifications: <br />residential (single family and duplexes), multifamily, small commercial, large <br />commercial - industrial, and irrigation. The first meters on residential single - family <br />homes were installed in 1975 and at of the end of 2006 there were no unmetered <br />residential connections. Multifamily dwellings had meters first installed in 1976 and <br />are completely metered. Meters for large commercial and small commercial <br />