Contents Overview ....................................................................................................................................................... 2 Section 1 – Analysis of Supply Reliability and Seismic Risk Assessment....................................................... 5 1.1 Supply Reliability Scenario Planning............................................................................................ 5 1. 2 Catastrophic Interruption ............................................................................................................ 6 1.3 Seismic Risk Assessment and Mitigation Plan ............................................................................. 8 1.4 Multiple Dry Year Analysis and Drought Risk Assessment ........................................................ 11 Section 2 – Annual Water Supply and Demand Assessment Procedures................................................... 14 2.1 Water Supply and Demand Assessment Requirements............................................................ 14 2.2 Annual Water Supply and Demand Assessment Procedures .................................................... 15 Section 3 – Six Standard Shortage Stages ................................................................................................... 25 3.1 Imported Water Shortage ......................................................................................................... 26 3.2 Emergency Supplies................................................................................................................... 27 3.3 Stages of Action by Level ........................................................................................................... 29 Section 4 – Additional Shortage Response Actions .................................................................................... 33 4.1 Standard IRWD Practices for Shortage Response ..................................................................... 33 4.2 Voluntary Reduction Measures ................................................................................................. 34 4.3 Use of Budget-Based Rates ....................................................................................................... 35 4.4 End-Use Prohibitions ................................................................................................................. 38 4.5 Critical Shortage Measures........................................................................................................ 38 4.6 Operational Drought Control Measures.................................................................................... 39 Section 5 – Communication Protocols ........................................................................................................ 40 Section 6 – Compliance and Enforcement .................................................................................................. 42 Section 7 – Legal Authorities ...................................................................................................................... 43 Section 8 – Financial Consequences ........................................................................................................... 44 8.1 Cost of Compliance.................................................................................................................... 45 Section 9 – Monitoring and Reporting........................................................................................................ 46 Section 10 – WSCP Refinement Procedures ............................................................................................... 47 Exhibit A – Draft Water Shortage Contingency Resolution ........................................................................ 49 Exhibit B – EPA Emergency Response Plan (ERP) Certification Receipt and Confirmation ........................ 51 Exhibit C – Orange County Water and Wastewater Multi-Jurisdictional Hazard Mitigation Plan.............. 52
WSCP - 1
IRWD – 2025 Water Shortage Contingency Plan
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