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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> 3.4.3 Demographic Projection Methodology <br /> CDR is a collaborative research center established in 1996 to provide accurate and timely demographic <br /> data on population, housing, and employment in Orange County. CDR serves as Orange County's <br /> authoritative source for demographic information.The City obtains its service area population and <br /> dwelling unit data from the Municipal Water District of Orange County (MWDOC)via CDR. <br /> MWDOC contracts with CDR to update the 2010 population estimates through the current year and to <br /> provide an annual estimate of population served by each of its retail water suppliers within its service <br /> area. CDR uses geographic information system (GIS) mapping and data from the 2000, 2010, and 2020 <br /> US Decennial Censuses, State Department of Finance (DOF) population estimates, and the CDR annual <br /> population estimates and Housing inventory System (HIS). These annual estimates incorporate annual <br /> revisions to the DOF annual population estimates, often for every year back to the most recent Decennial <br /> Census.As a result, all previous estimates are set aside and replaced with the most current set of annual <br /> estimates.Annexations and boundary changes for water suppliers are incorporated into these annual <br /> estimates. <br /> Demographic projections used for this UWMP reflect the most recently available set of projections <br /> developed by CDR based on its 2022 Orange County Projections. Demographic projections for Orange <br /> County are updated every 4 years, with the next set of projections expected in the late fall of 2026.The <br /> 2022 Orange County Projections accounted for Draft RHNA rezone sites with jurisdictions including the <br /> number of dwelling units that are most likely to occur/get built by the end of 2050 under assumptions <br /> and trends existing at the time of the forecasting effort, including a parcel-level inventory of additional <br /> housing capacity from sites that were to be rezoned to accommodate the 6th RHNA cycle. In the summer <br /> of 2025, projections by water supplier for population and dwelling units by type were estimated using the <br /> 2022 Orange County Projections dataset. Growth for each of the five-year increments was allocated using <br /> GIS and a review of the traffic analysis zones (TAZ) data with a 2023 aerial photo. The projected <br /> population growth was added to the 2025 estimates for each respective water supplier included in the <br /> dataset. <br /> 3.5 Land Uses <br /> G ' (Current Land Uses <br /> The City's service area can best be described as a predominantly single- and multi-family residential <br /> community located in central Orange County. Based on the zoning designation collected and aggregated <br /> by Southern California Association of Governments (SCAG) around 2018, the current land use within the <br /> City's service area can be categorized as follows: <br /> ■ Single-family residential:48 percent. <br /> ■ Multi-family residential: 14.1 percent. <br /> ■ Commercial: 10.8 percent. <br /> ■ Industrial: 7.1 percent. <br /> ■ Institutional/Governmental: 10.3 percent. <br /> ■ Open space and parks: 8.4 percent. <br /> CITY OF SANTA ANA <br />