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2015 URBAN WATER MANAGEMENT PLAN <br />Process water <br />Water suppliers within the OC Basin, including the City, have the option of choosing to deduct recycled <br />water used for indirect potable reuse from their gross water use to account for the recharge of recycled <br />water into the OC Basin by OCWD, historically through Water Factory 21, and now by the Groundwater <br />Replenishment System (GW RS). <br />Water suppliers must report baseline water use for two baseline periods, the 10- to 15-year baseline <br />(baseline GPCD) and the five-year baseline (target confirmation) as described below. <br />2.5.1.1 Ten to 15-Year Baseline Period (Baseline GPCD) <br />The first step to calculating the City's water use targets is to determine its base daily per capita water use <br />(baseline water use). This baseline water use is essentially the City's gross water use divided by its <br />service area population, reported in GPCD. The baseline water use is calculated as a continuous (rolling) <br />10-year average during a period, which ends no earlier than December 31, 2004 and no later than <br />December 31, 2010. Water suppliers whose recycled water made up 10 percent or more of their 2008 <br />retail water delivery can use up to a 15-year average for the calculation. The City did not have recycled <br />water use in 2008; therefore, a 10-year baseline period is used. <br />The City's baseline water use is 130 GPCD, obtained from the 10-year period July 1, 1995 to June 30, <br />2005. <br />2.5.1.2 Five -Year Baseline Period (Target Confirmation) <br />Water suppliers are required to calculate water use, in GPCD, for a five-year baseline period. This <br />number is used to confirm that the selected 2020 target meets the minimum water use reduction <br />requirements. Regardless of the compliance option adopted by the City, it will need to meet a minimum <br />water use target of 5 percent reduction from the five-year baseline water use. This five-year baseline <br />water use is calculated as a continuous five-year average during a period, which ends no earlier than <br />December 31, 2007 and no later than December 31, 2010. The City's five-year baseline water use is 122 <br />GPCD, obtained from the five-year period July 1, 2003 to June 30, 2008. <br />2.5.1.3 Service Area Population <br />The City's service area boundaries correspond with the boundaries for a city or census designated place. <br />This allows the City to use service area population estimates prepared by the Department of Finance <br />(DOF). The CDR at California State University, Fullerton is the entity which compiles population data for <br />Orange County based on DOF data. The calculation of the City's baseline water use and water use <br />targets in the 2010 UWMP was based on the 2000 U.S. Census population numbers obtained from CDR. <br />The baseline water use and water use targets in this 2015 UWMP have been revised based on the 2010 <br />U.S. Census population obtained from CDR in 2012. <br />arwdis.wm 5"B'% 2-11 <br />