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Urban Water Management Plan

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Urban Water Management Plan CITY OF PASO ROBLES | CALIFORNIA URBAN WATER MANAGEMENT PLAN Final July 2021 City of El Paso de Robles 2020 Urban Water Management Plan Final July 2021 2490 Mariner Square Loop, Suite 215 Alameda, CA 94501 510.747.6920 www.toddgroundwater.com Table of Contents EXECUTIVE SUMMARY ..................................................................................................... ES-1 1. INTRODUCTION AND OVERVIEW .................................................................................. 1 1.1. Background and Purpose........................................................................................... 1 1.2. Urban Water Management Plan Changes .................................................................. 1 1.3. UWMPs in Relation to Other Planning Efforts ............................................................ 2 1.4. UWMP Organization ................................................................................................. 3 1.5. Lay Descriptions ........................................................................................................ 4 2. PLAN PREPARATION ..................................................................................................... 9 2.1. Basis for Preparing a Plan and Plan Compliance ......................................................... 9 2.2. Coordination and Outreach ....................................................................................... 9 3. WATER SYSTEM DESCRIPTION .................................................................................... 11 3.1. General Description ................................................................................................ 11 3.2. Service Area and Land Use ...................................................................................... 11 3.3. Climate ................................................................................................................... 12 3.4. Population .............................................................................................................. 13 3.5. Other Social, Economic, and Demographic Factors .................................................. 13 4. WATER USE ................................................................................................................ 15 4.1. City Water Use ........................................................................................................ 15 4.1.1. Current Water Use .......................................................................................... 15 4.1.2. Projected Water Use ....................................................................................... 16 4.2. Distribution System Water Losses ........................................................................... 17 4.3. Future Water Savings .............................................................................................. 18 4.4. Water Use for Lower Income Households................................................................ 20 4.5. Climate Change ....................................................................................................... 21 5. BASELINES, TARGETS AND 2020 COMPLIANCE ............................................................ 22 5.1. Baseline and Targets ............................................................................................... 22 5.1.1. 10- or 15-year Baseline Period ......................................................................... 22 5.1.2. 5-year Baseline Period ..................................................................................... 22 5.1.3. Service Area Population ................................................................................... 23 5.1.4. Gross Water Use.............................................................................................. 23 Paso Robles 2020 UWMP i TODD GROUNDWATER 5.1.5. Baseline Daily Per Capita Water Use ................................................................ 23 5.2. 2015 and 2020 Targets ............................................................................................ 24 5.3. 2015 Compliance Daily per Capita Water Use .......................................................... 24 5.4. 2020 Compliance Daily Per Capita Water Use .......................................................... 25 6. WATER SUPPLIES ........................................................................................................ 26 6.1. Purchased or Imported Water ................................................................................. 26 6.2. Surface Water ......................................................................................................... 28 6.3. Groundwater .......................................................................................................... 28 6.3.1. Paso Robles Area Subbasin .............................................................................. 29 6.3.2. Atascadero Area Subbasin ............................................................................... 30 6.3.3. Groundwater Basin Monitoring and Management ........................................... 31 6.4. Other Water Supplies .............................................................................................. 33 6.5. Wastewater and Recycled Water ............................................................................ 33 6.5.1. Wastewater ..................................................................................................... 33 6.5.2. Water Recycling............................................................................................... 34 Actions to Encourage and Optimize Recycled Water Use ................................................ 35 6.5.3. Other Supply Opportunities ............................................................................. 36 6.6. Future Water Projects ............................................................................................. 36 6.7. Summary of Existing and Planned Sources of Water ................................................ 36 6.8. Climate Change Impact to Supply ............................................................................ 38 6.9. Energy Use .............................................................................................................. 40 7. WATER SERVICE RELIABILITY AND DROUGHT RISK ASSESSMENT ................................. 41 7.1. Water Service Reliability Assessment ...................................................................... 41 7.1.1. Constraints on Water Supply ........................................................................... 41 7.1.2. Year Type Characterization .............................................................................. 44 7.1.3. Supply and Demand Comparison ..................................................................... 45 7.1.4. Description of Management Tools and Options ............................................... 47 7.2. Drought Risk Assessment ........................................................................................ 47 7.2.1. Data, Methods, and Basis for Water Shortage Conditions ................................ 47 7.2.2. Water Source Reliability .................................................................................. 49 7.2.3. Total Water Supply and Use Comparison ......................................................... 49 8. WATER SHORTAGE CONTINGENCY PLANNING ............................................................ 50 8.1. Water Supply Reliability Analysis ............................................................................. 50 Paso Robles 2020 UWMP ii TODD GROUNDWATER 8.2. Annual Water Supply and Demand Assessment Procedures .................................... 51 8.2.1. Shortage Levels ............................................................................................... 51 8.3. Shortage Response Actions ..................................................................................... 53 8.4. Other WSCP Requirements...................................................................................... 53 9. DEMAND MANAGEMENT MEASURES ......................................................................... 54 9.2.1. Implementation Over the Past Five Years ........................................................ 60 9.2.2. Implementation to Achieve Water Use Targets ................................................ 61 9.3. Water Use Objectives .............................................................................................. 61 10. PLAN ADOPTION, SUBMITTAL, AND IMPLEMENTATION .............................................. 63 10.1. Public Hearing and Adoption ............................................................................... 63 10.2. Plan Submittal and Availability ............................................................................ 63 10.3. UWMP Checklist .................................................................................................. 63 11. REFERENCES ............................................................................................................... 73 List of Tables (in body of text) Table 1. Coordination Summary........................................................................................ 10 Table 2. Climate Summary ................................................................................................ 12 Table 3. Current and Future Population ............................................................................ 13
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