2015 URBAN WATER MANAGEMENT PLAN FINAL JUNE 2016 2015 URBAN WATER MANAGEMENT PLAN 2015 URBAN WATER MANAGEMENT PLAN Santa Margarita Water District FINAL Prepared for: Don Bunts Chief Engineer Santa Margarita Water District 26111 Antonio Pkwy Rancho Santa Margarita, CA 92688 Prepared by: Arcadis U.S., Inc. 445 South Figueroa Street Suite 3650 Sarina Sriboonlue, P.E. Los Angeles Staff Environmental Engineer California 90071 Tel 213 486 9884 Fax 213 486 9894 Our Ref.: 27704002.0000 Date: June 2016 arcadis.com 2015 URBAN WATER MANAGEMENT PLAN CONTENTS Acronyms and Abbreviations ....................................................................................................................... vii 1 Introduction ......................................................................................................................................... 1-1 1.1 Urban Water Management Plan Requirements .......................................................................... 1-1 1.2 Agency Overview ........................................................................................................................ 1-3 1.3 Service Area and Facilities ......................................................................................................... 1-6 1.3.1 Santa Margarita Water District Service Area ................................................................... 1-6 1.3.2 Santa Margarita Water District Water Facilities ............................................................... 1-8 2 Demands ............................................................................................................................................. 2-1 2.1 Overview ..................................................................................................................................... 2-1 2.2 Factors Affecting Demand .......................................................................................................... 2-1 2.2.1 Climate Characteristics .................................................................................................... 2-1 2.2.2 Demographics.................................................................................................................. 2-3 2.2.3 Land Use ......................................................................................................................... 2-3 2.3 Potable Water Use by Customer Type ....................................................................................... 2-4 2.3.1 Overview .......................................................................................................................... 2-4 2.3.2 Non-Residential ............................................................................................................... 2-5 2.3.3 Other Uses ....................................................................................................................... 2-5 2.3.4 Sales to Other Agencies .................................................................................................. 2-5 2.3.5 Non-Revenue Water ........................................................................................................ 2-5 2.4 Demand Projections .................................................................................................................... 2-6 2.4.1 Demand Projection Methodology .................................................................................... 2-6 2.4.2 Agency Refinement ......................................................................................................... 2-7 2.4.3 25 Year Projections ......................................................................................................... 2-7 2.4.4 Total Water Demand Projections .................................................................................... 2-8 2.4.5 Water Use for Affordable Housing ................................................................................... 2-8 2.5 SBx7-7 Requirements ............................................................................................................... 2-12 2.5.1 Baseline Water Use ....................................................................................................... 2-12 2.5.1.1 Ten to 15-Year Baseline Period (Baseline GPCD) .............................................. 2-12 2.5.1.2 Five-Year Baseline Period (Target Confirmation) ................................................ 2-13 arcadis.com i 2015 URBAN WATER MANAGEMENT PLAN 2.5.1.3 Service Area Population ...................................................................................... 2-13 2.5.2 SBx7-7 Water Use Targets ............................................................................................ 2-13 2.5.2.1 SBx7-7 Target Methods ....................................................................................... 2-13 2.5.2.2 2015 and 2020 Targets ........................................................................................ 2-14 2.5.3 Regional Alliance ........................................................................................................... 2-15 3 Water Sources and Supply Reliability ................................................................................................. 3-1 3.1 Overview ..................................................................................................................................... 3-1 3.2 Imported Water ........................................................................................................................... 3-2 3.2.1 Colorado River Supplies .................................................................................................. 3-2 3.2.2 State Water Project Supplies ........................................................................................... 3-5 3.2.3 Storage ............................................................................................................................ 3-8 3.3 Groundwater ............................................................................................................................... 3-8 3.3.1 San Juan Basin Characteristics ....................................................................................... 3-8 3.3.2 Groundwater Historical Extraction ................................................................................. 3-11 3.3.3 Transfers and Exchanges .............................................................................................. 3-11 3.4 Summary of Existing and Planned Sources of Water ............................................................... 3-11 3.5 Recycled Water ......................................................................................................................... 3-13 3.6 Supply Reliability ....................................................................................................................... 3-13 3.6.1 Overview ........................................................................................................................ 3-13 3.6.2 Factors Impacting Reliability .......................................................................................... 3-13 3.6.2.1 Environment ......................................................................................................... 3-13 3.6.2.2 Legal .................................................................................................................... 3-14 3.6.2.3 Water Quality ....................................................................................................... 3-14 3.6.2.3.1 Imported Water .......................................................................................... 3-14 3.6.2.3.2 Groundwater .............................................................................................. 3-14 3.6.2.4 Climate Change ................................................................................................... 3-15 3.6.3 Normal-Year Reliability Comparison ............................................................................. 3-15 3.6.4 Single-Dry Year Reliability Comparison ........................................................................ 3-16 3.6.5 Multiple-Dry Year Period Reliability Comparison .......................................................... 3-16 3.7 Supply and Demand Assessment ............................................................................................. 3-17 4 Demand Management Measures ........................................................................................................ 4-1 arcadis.com ii 2015 URBAN WATER MANAGEMENT PLAN 4.1 Water Waste Prevention Ordinances ......................................................................................... 4-1 4.2 Metering ...................................................................................................................................... 4-4 4.3 Conservation Pricing ................................................................................................................... 4-5 4.4 Public Education and Outreach .................................................................................................. 4-7 4.5 Programs to Assess and Manage Distribution System Real Loss ........................................... 4-10 4.6 Water Conservation Program Coordination and Staffing Support ............................................ 4-10 4.7 Other Demand Management Measures ................................................................................... 4-12