Results of the DRA indicate that IRWD has sufficient supplies to meet its projected demands, even during multiple dry years ( Table 1-3 ). Supplies are expected to exceed IRWD’s projected water use for all future years evaluated ( Table 1-2 and Table 1-3 ). Recycled water is considered a drought resistant supply. Therefore, Table 1-2 and Table 1-3 show only potable supplies and demands. For additional tables and non-potable results refer to the 2025 UWMP Section 7 and Appendix D. The DRA indicates that even in five years of consecutive drought there is a water supply surplus without the use of WSCP response actions. When Metropolitan WSCP response actions trigger a Level 10 shortage condition (more than 50% reduction in imported supplies), IRWD would only be in a Level 1 shortage condition (less than 10%, see WSCP Section 3.1) due to its diversified portfolio and availability of local supplies For additional details on the Multiple Dry Year Analysis and DRA refer to 2025 UWMP Section 7. Table 1 ‑ 2: Multiple Dry Year Water Reliability Analysis – Potable Water DWR Submittal Table 7-4 Retail: Multiple Dry Years Supply and Use Comparison - Potable 2030 2035 2040 2045
Supply totals
101,863 101,863 101,863 101,863
First year
Use totals
55,772 46,091
56,394 45,469
56,911 44,952
56,999 44,864
Surplus/(shortfall)
Supply totals
101,863 101,863 101,863 101,863
Second year
Use totals
56,330 45,533
56,958 44,905
57,480 44,383
57,569 44,294
Surplus/(shortfall)
Supply totals
101,863 101,863 101,863 101,863
Third year
Use totals
56,893 44,970
57,528 44,335
58,055 43,808
58,144 43,719
Surplus/(shortfall)
Supply totals
101,863 101,863 101,863 101,863
Fourth year
Use totals
56,324 45,539
56,953 44,910
57,474 44,389
57,563 44,300
Surplus/(shortfall)
Supply totals
101,863 101,863 101,863 101,863
Fifth year
Use totals
53,508 48,355
54,105 47,758
54,600 47,263
54,685
Surplus/(shortfall) 47,178 NOTES: [1] Use totals are based on average year values provided by MWDOC with a: 5% increase in Year 1; 1% increase in Year 2 and Year 3; 1% decrease in Year 4; and a 5% decrease in Year 5. Source: IRWD 2025 UWMP, DWR Table 7 – 4
WSCP - 12
IRWD – 2025 Water Shortage Contingency Plan
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