1 Table of contents 660

Draft 2025 Urban Water Management Plan

Learn more at irwd.com/doing-business/urban-water-management-plan.

Cover		1
Contact Sheet		2
Acronyms Definitions		3
Table of Contents		8
Executive Summary		13
Section 1		17
Section 1 | Introduction		17
1.1 Urban Water Management Planning Act		17
1.2 Irvine Ranch Water District (IRWD)		17
1.3 Purpose and Importance: IRWD Water Resources Planning		18
1.4 UWMP Organization and Section Summaries		18
Section 2		21
Section 2 | Plan Preparation		21
2.1 Basis for Preparing a Plan		21
2.2 Public Water Systems		21
2.3 Regional Planning and Regional Alliance		22
2.4 Standardized Tables, Year, and Units of Measurement		22
2.5 Coordination and Outreach		24
Coordination with Wholesale Agencies		24
Coordination with Water Suppliers and the Community		25
Section 3		27
Section 4		37
Section 4 | Water Use Characterization		37
4.1 Description of Defined Water Use Sectors		38
4.2 Past, Current, and Projected Water Use by Sector		39
Estimating Future Water Savings		41
Water Use of Lower Income Households		42
Climate Change Considerations on Customer Water Use		42
4.3 Distribution Water System Losses		43
Section 5		44
Section 5 | SBX7-7 Baselines and Targets		44
5.1 2020 Water Conservation Mandate		44
5.2 Regional Alliance		45
Section 6		46
Section 7		70
Section 7 | Water Supply Reliability and ………… Drought Risk Assessment		70
7.1 Constraints on Water Sources Considerations		70
A. Recent IRWD Water Reliability Studies and Evaluations		71
B. Historic Drought Analysis		73
C. Water Supply Reliability Projections		73
IRWD Normal Year Projections		74
IRWD Single Dry Year Projections		74
IRWD Multiple Dry Year Projections		75
7.2 Water Service Reliability Assessment		77
A. Imported Water		77
B. Groundwater Supply		77
7.3 Water Quality		79
Groundwater Quality		80
Other Water Quality Considerations		80
Imported Water Quality		81
7.4 Drought Risk Assessment		81
Drought Risk Assessment Data Inputs and Methods		82
A. Total Water Use (Demands)		82
B. Total Supplies		83
Drought Risk Assessment Conclusions		84
A. Surplus and Shortfall without WSCP Actions		84
B. Planned WSCP Actions		84
Section 8		86
Section 8 | Water Shortage Contingency Plan		86
8.1 Overview of Water Shortage Contingency Plan		86
8.2 Summary of Sections and Requirements		87
8.3 Copy of DWR Tables		88
8.4 Plan Adoption, Submittal, and Availability		93
Section 9		94
Section 9 | Demand Management Measures		94
9.1 Demand Management Measure Implementation		94
A. Budget-Based Rate Structure		95
B. Revenue Stability		95
C. Price Signal to Reduce Water Waste		96
D. Rate Structure Results		96
9.2 Water Use Efficiency Programs and Resources		97
A. Programs		97
B. Workshops and Tours		98
C. Public Outreach and Social Media		98
D. Education Programs		98
E. Water Waste Prevention		99
F. Metering		100
G. Distribution System Loss		101
H. Water Efficiency Staffing		101
9.3 California Water Efficiency Partnership		101
Section 10		102
References		107
Appendices		110
Appendix A- DWR Checklist		111
Appendix B- Reduced Reliance on the Delta		125
Appendix C- Outreach Letters		148
Appendix D- DWR Submittal Tables		166
Appendix E- Water Shortage Contingency Plan		190
Appendix F- Basin 8-1 Alternative		283
basin-8-1-final-draft-2022-alternative-update.pdf		484
FINAL_STAMPED_South East Management Area_Alternative_2022 UPDATE.pdf		484
SE_Mngt_Area_5yr_Rpt_Signed_Cvrpg		484
Appendix G- OC Demand Projection Model TM		579
Appendix H- Resolutions		655

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