supplemental use during an emergency during major droughts and supply interruptions and are not included in Table B-2 , however these non-Delta water supplies captured in wet years do contribute to reduced reliance on the Delta and regional self-reliance.
Metropolitan and MWDOC Reduced Reliance on Delta Water Supplies
IRWD is not a state water contractor or regional water supplier and therefore must rely on data from Metropolitan and MWDOC to complete Table B-3. Metropolitan’s service area, as a whole, reduces reliance on the Delta through investments in non-Delta water supplies, local water supplies and demand management measures. Due to the regional nature of these investments, IRWD is relying on Metropolitan’s regional accounting of directly measurable reductions in supplies from the Delta Watershed. Quantifying IRWD’s investments in self-reliance, locally, regionally, and throughout Southern California is infeasible for the reasons as noted in this Appendix C Sections C.5 and C.6. Table B-3 shows the data included in Metropolitan’s 2025 UWMP Appendix 10 (Metropolitan Table A.10-3), which provides the expected outcomes for Metropolitan’s reduced reliance on the Delta. The results shown in Table B-3 demonstrate that Metropolitan’s service area, including IRWD, is measurably reducing its Delta reliance. In the near-term (2030), the expected outcome for normal water year reliance on supplies from the Delta watershed decreased by 466 Thousand Acre Feet (TAF) from the 2010 baseline; this represents a decrease of 6 percent of 2030 normal water year retail demands. In the long-term (2050), normal water year reliance on supplies from the Delta watershed decreased by 537 TAF from the 2010 baseline; this represents a decrease of just over 9 percent of 2050 normal water year retail demands.
Appendix B - 12
IRWD – 2025 Urban Water Management Plan – Reduced Delta Reliance
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