Item 28 - Urban Water Management Plan and Water Shortage Contingency Plan

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Santa Ana 2020 Urban Water Management Plan arcadis.com 3-8 Table 3-3: City of Santa Ana Service Area Dwelling Units by Type City of Santa Ana Service Area Dwelling Units by Type Dwelling Units 2020 2025 2030 2035 2040 2045 Total 78,650 82,043 82,061 82,225 82,238 82,243 Single Family 34,133 34,329 34,329 34,333 34,337 34,341 All Other* 44,517 47,714 47,732 47,892 47,901 47,902 Source: Center for Demographic Research at California State University, Fullerton, 2020 *Includes duplex, triplex, apartment, condo, townhouse, mobile home, etc. Yachts, houseboats, recreational vehicles, vans, etc. are included if is primary place of residence. Does not include group quartered units, cars, railroad box cars, etc. In addition to the types and proportions of dwelling units, various socio-economic factors such as age distribution, education levels, general health status, income and poverty levels affect City’s water management and planning. Based on U.S. Census Bureau's QuickFacts, the City has about 9% of population of 65 years and over, 26.9% under the age of 18 years and 7.4% under the age of 5 years. 59.6% of the City’s population with an age of more than 25 years has a minimum of high school graduate and 15% of this age group has at least a bachelor’s degree. 3.4.3 CDR Projection Methodology The City obtains its services area population and dwelling unit data from MWDOC via CDR. MWDOC contracts with CDR to update the historic population estimates for 2010 to the current year and provide an annual estimate of population served by the water suppliers in OC. CDR uses GIS and data from the 2000 and 2010 U.S. Decennial Censuses, State Department of Finance (DOF) population estimates, and the CDR annual population estimates. These annual estimates incorporate annual revisions to the DOF annual population estimates, often for every year back to the most recent Decennial Census. As a result, all previous estimates were set aside and replaced with the most current set of annual estimates. Annexations and boundary changes for water suppliers are incorporated into these annual estimates. In the summer of 2020, projections by water supplier for population and dwelling units by type were estimated using the 2018 Orange County Projections dataset. Growth for each of the five-year increments was allocated using GIS and a review of the traffic analysis zones (TAZ) with a 2019 aerial photo. The growth was added to the 2020 estimates by the water supplier. Land Uses 3.5.1 Current Land Uses The City’s service area can best be described as a predominantly single and multi-family residential community located in central Orange County.