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Table 57. Proposed 5-year Fixed Charge Schedule, Private Fire <br />Revenue Adjustment <br />9.0% <br />9.0% <br />9.0% <br />9.0% <br />8.0% <br />Meter Size <br />2026 <br />2027 <br />2028 <br />2029 <br />2" <br />$3.90 <br />$4.25 <br />$4.63 <br />$5.05 <br />$5.45 <br />3" <br />$7.63 <br />$8.32 <br />$9.07 <br />$9.88 <br />$10.67 <br />4" <br />$14.07 <br />$15.34 <br />$16.72 <br />$18.23 <br />$19.69 <br />6" <br />$37.20 <br />$40.55 <br />$44.20 <br />$48.17 <br />$52.03 <br />8" <br />$77.08 <br />$84.02 <br />$91.58 <br />$99.83 <br />$107.81 <br />101, <br />$137.08 <br />$149.42 <br />$162. 86 <br />$177. 52 <br />$191. 72 <br />12" <br />$220.23 <br />$240.05 <br />$261.65 <br />$285.20 <br />$308.02 <br />Variable Water Rates <br />Variable rates are designed based on variable costs such as water supply and base delivery costs. The <br />current rate structure was maintained to the extent possible mitigate rate impacts. Variable rates are <br />made up of a number of cost components, all derived based on actual customer use data: Water Supply <br />and Base Costs. Water supply costs are offset by the City's non -operating revenues. <br />Tier Widths <br />The City's current tier widths take into account the availability of water supply for each customer class <br />and meter size. The widths were designed based on common use characteristics and the capacity <br />investment14 of different meter sizes. The current widths are shown in Table 2. The proposed tier widths <br />are applied equally to all customer classes to ensure equitability between customers. To determine <br />equitable tier widths, an analysis of available water supplies was completed. Total water demand is <br />projected to be 13.5 million ccf. Table 58 shows the total available water supplies under each supply <br />category based on the percentage of supply. <br />Table 58. Available Water Supplies Under Each Supply Category <br />Total 100.0% 13,536,745 <br />Groundwater 85.0% 11,506,233 <br />Purchased Water 15.0% 2,030,512 <br />In order to allocate the available groundwater to Tier 1, the total supply available was divided by the <br />number of bills. Table 59 shows the available groundwater supply divided by the number of annual <br />bills. The base availability of tier 1 is 21 ccf. <br />14 2019 Water, Recycled Water, & Sewer Rate Study Report Final. October 1, 2019. Stantec & Hidebrand. City of Santa Ana <br />City of Santa Ana - 2026 Water and Sewer Rate Study 42 <br />