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City of Pleasanton
<br />2025 Water Rate Study
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<br />Water Resources Economics
<br />88
<br />Table 6-4: Water Supply Cost Differences by Stage
<br />Line Zone 7 Water Purchases Baseline Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Stage 6
<br />1 Total Consumption 5,028,944 4,526,050 4,023,155 3,520,261 3,017,366 2,514,472 2,011,578
<br />2 Water Loss (%) 10% 10% 10% 10% 10% 10% 10%
<br />3 Total Production 5,587,716 5,028,944 4,470,172 3,911,401 3,352,629 2,793,858 2,235,086
<br />4 Zone 7 Variable Charge $2.46 $2.46 $2.46 $2.46 $2.46 $2.46 $2.46
<br />5 Zone 7 Variable Cost $13,717,842 $12,346,058 $10,974,273 $9,602,489 $8,230,705 $6,858,921 $5,487,137
<br />6
<br />7 Supply Cost Difference $0 ($1,371,784) ($2,743,568) ($4,115,353) ($5,487,137) ($6,858,921) ($8,230,705)
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<br />DROUGHT COSTS
<br />Table 6-5 shows the water shortage costs by stage, which includes the variable revenue loss (Table 6-3) and supply cost differences (Table 6-4).
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<br />The total cost of each water shortage stage (Line 3) represents the costs that the proposed drought rates are designed to recover. Potable water
<br />usage (Line 5) is from Table 6-2 (Line 16), accounting for the drought allotment policy. The unit cost for each stage (Line 6) is calculated by
<br />dividing the total drought costs (Line 3) by the potable water usage (Line 5) in each stage.
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<br />Table 6-5: Drought Costs by Stage
<br />Line Drought Costs Baseline Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Stage 6
<br />1 Variable Revenue Loss $0 $2,866,498 $5,732,996 $8,599,494 $11,465,992 $14,332,490 $17,198,988
<br />2 Supply Cost Difference $0 ($1,371,784) ($2,743,568) ($4,115,353) ($5,487,137) ($6,858,921) ($8,230,705)
<br />3 Total Costs $0 $1,494,714 $2,989,428 $4,484,142 $5,978,856 $7,473,570 $8,968,283
<br />4
<br />5 Potable Water Usage 3,957,872 3,454,978 2,952,083 2,449,189 1,946,294 1,443,400 940,506
<br />6 Unit Cost $0.00 $0.43 $1.01 $1.83 $3.07 $5.18 $9.54
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