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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> 800.000 3.50 <br /> 700.000 n r n n In 3.00 <br /> 600.000 <br /> 2 50 <br /> 500.00 C = <br /> 2.00 <br /> n <br /> 400.00 C c <br /> 1.50 <br /> G 300.000 0 <br /> a <br /> 1.00 <br /> 200.000 <br /> 100.00 C <br /> Q, .-- 0V ID -0 O, Q, 0 M s} h 'O W O> O .- N M V �] �D f� O O> O .-- N M <br /> O3, M0 rn rn rn rn M rn o 0 0 0 0 0 0 0 0 0 -- �!! N N N N N N <br /> N � `O O 1, -0 M 6 .� N 0 4 0 <0 < GD 6 4 6 6 .- N 6 `P <br /> aD rn oa rn rn rn rn rn rn rn rn o 0 0 0 0 0 0 0 0 0 <br /> Fiscal Year <br /> MRetail M8J Water Usaae(Includes Recycled Water) —0C Service Area Population <br /> Figure 4.1 Historical Water Use and Population in Orange County <br /> Orange County's trending decline in water usage can most notably be attributed to Orange County water <br /> agencies' past efforts to achieve regional and individual compliance with Senate Bill (SB) X7-7, the Water <br /> Conservation Act of 2009, through the Orange County 20x2020 Regional Alliance and compliance with <br /> Executive Order (EO) B-29-15. EO B-29-15 mandated 25 percent reduction in potable water use in <br /> response to the 2013-2014 drought. Furthermore, Orange County water agencies' ongoing progress <br /> towards achieving SB 606 and Assembly Bill (AB) 1668, the "Making Conservation a California Way of Life" <br /> legislation,water use objectives continue to exemplify Orange County water agencies' commitment to <br /> water conservation,water use efficiency, and overall reduction in potable water usage in recent decades. <br /> In 2025, MWDOC and Orange County Water District (OCWD), in collaboration with MWDOC's member <br /> agencies and the cities of Anaheim, Fullerton, and Santa Ana, led the effort to develop the 2025 Orange <br /> County Water Demand Projection Model. The Orange County Water Demand Projection Model <br /> (MWDOC, 2025) was used to project long-term water demand under three hydrologic conditions (normal <br /> year, single dry year, and five consecutive dry years) over a 25-year horizon in 5-year increments, <br /> consistent with the 2025 UWMP requirements. <br /> Although Orange County demands are forecast to be relatively flat into the future, with water use <br /> efficiency efforts counterbalancing new growth, Figure 4.2 shows that annual variations in weather could <br /> cause high fluctuations. Some examples of this are described below: <br /> ■ Single-family consumption is highly seasonal, and the model correlates well with seasonality and <br /> temperature by capturing fluctuations in single-family outdoor irrigation. <br /> ■ Multi-family use is generally less responsive to weather than single-family demands, as much of <br /> multi-family outdoor irrigation has been shifted into the irrigation-specific water use sector <br /> (dedicated irrigation meters), and generally newer multi-family dwellings in Orange County have <br /> comparatively less landscaped area than generally older single-family dwellings due to Model Water <br /> CITY OF SANTA ANA <br />