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WATER UTILITY <br />3.1 Financial Plan <br />RDN built a 10-year financial model for the water utility to meet the City's long-term financial goals. <br />Demand Projections <br />Using historical billing records, RDN first calculated aggregate water usage to establish a baseline for <br />demand projections. We then determined per -account usage for each customer class by dividing total <br />usage by the number of accounts. For the purposes of this study, per -account usage was assumed to <br />remain constant over the forecast period. This assumption allows projected changes in water demand to <br />be driven solely by changes in the number of accounts. Finally, projected account counts were multiplied <br />by per -account usage to estimate total water demand by customer class. Figure 4 shows the City's <br />projected water demand over the next ten years. <br />Figure 4. Annual Aggregate Water Use, FY 2026 to FY 2036 <br />,- 16.00 <br />° 14.00 13.64 13.68 13.70 13.74 13.78 13.80 13.83 13.86 13.90 13.93 13.95 <br />12.00 0Ohl <br />10.00 ■ <br />8.00 <br />6.00 <br />4.00 <br />2.00 <br />0.00 <br />FY 2026 FY 2027 FY 2028 FY 2029 FY 2030 FY 2031 FY 2032 FY 2033 FY 2034 FY 2035 FY 2036 <br />■ Single Family Residential ■ Multi -Family Residential ■ Non -Residential Recycled <br />City of Santa Ana - 2026 Water and Sewer Rate Study 17 <br />