2020COACHELLA VALLEY REGIONAL URBAN WATER MANAGEMENT PLAN PUBLIC REVIEW DRAFT | MAY 25, 2021 2020 Coachella Valley Regional Urban Water Management Plan Prepared For: Coachella Valley Water District Coachella Water Authority Desert Water Agency Indio Water Authority Mission Springs Water District Myoma Dunes Mutual Water Company 6/30/2021 Prepared by Water Systems Consulting, Inc. 2020 Coachella Valley Regional Urban Water Management Plan Chapter 1 Introduction ............................................................................................................................. 1-1 Purpose ............................................................................................................................................ 1-1 RUWMP Organization ...................................................................................................................... 1-2 Plain Language Summary ................................................................................................................ 1-3 Chapter 2 Agency Descriptions .............................................................................................................. 2-1 Agencies Participating in RUWMP ................................................................................................... 2-1 2.1.1 Coachella Valley Water District ................................................................................................. 2-3 2.1.2 Coachella Water Authority ......................................................................................................... 2-3 2.1.3 Desert Water Agency ................................................................................................................. 2-3 2.1.4 Indio Water Authority ................................................................................................................. 2-3 2.1.5 Mission Springs Water District ................................................................................................... 2-4 2.1.6 Myoma Dunes Mutual Water Company ..................................................................................... 2-4 Other Agencies and Entities ............................................................................................................. 2-4 2.2.1 Valley Sanitary District ............................................................................................................... 2-4 2.2.2 Agua Caliente Water Authority .................................................................................................. 2-4 2.2.3 City of Palm Springs .................................................................................................................. 2-5 2.2.4 Coachella Valley Regional Water Management Group ............................................................. 2-5 2.2.5 Indio Subbasin Groundwater Sustainability Agencies ............................................................... 2-5 2.2.6 Mission Creek Subbasin Management Committee ................................................................... 2-6 Outreach During RUWMP Preparation ............................................................................................ 2-6 Chapter 3 Regional Sources of Supply .................................................................................................. 3-1 Groundwater ..................................................................................................................................... 3-1 3.1.1 Basin Description ....................................................................................................................... 3-1 3.1.2 Groundwater Management ........................................................................................................ 3-6 3.1.3 Sustainable Groundwater Management Act .............................................................................. 3-7 3.1.4 Groundwater Quality .................................................................................................................. 3-7 Imported Water ................................................................................................................................. 3-8 3.2.1 Colorado River Water ................................................................................................................ 3-8 3.2.2 State Water Project Water/MWD Exchange ............................................................................ 3-13 Local Surface Water ....................................................................................................................... 3-16 Recycled Water .............................................................................................................................. 3-17 Consistency with the Delta Plan for Participants in Covered Actions ............................................ 3-20 Climate Change .............................................................................................................................. 3-20 Chapter 4 Coachella Valley Water District ............................................................................................. 4-1 Introduction ....................................................................................................................................... 4-1 4.1.1 Chapter Organization ................................................................................................................. 4-1 4.1.2 RUWMP in Relation to Other Efforts ......................................................................................... 4-1 i 2020 Coachella Valley Regional Urban Water Management Plan 4.1.3 RUWMP and Grant or Loan Eligibility ....................................................................................... 4-2 4.1.4 Demonstration of Consistency with the Delta Plan for Participants in Covered Actions ........... 4-2 Plan Preparation ............................................................................................................................... 4-2 4.2.1 Plan Preparation ........................................................................................................................ 4-2 4.2.2 Basis for Preparing a Plan ......................................................................................................... 4-2 4.2.3 Regional Planning ...................................................................................................................... 4-2 4.2.4 Individual or Regional Planning and Compliance ...................................................................... 4-3 4.2.5 Fiscal or Calendar Year and Units of Measure .......................................................................... 4-3 4.2.6 Coordination and Outreach ........................................................................................................ 4-3 System Description ........................................................................................................................... 4-3 4.3.1 General Description ................................................................................................................... 4-3 4.3.2 Jurisdictional Boundary .............................................................................................................. 4-5 4.3.3 Service Area Climate ................................................................................................................. 4-7 4.3.4 Service Area Population and Demographics ............................................................................. 4-8 4.3.5 Land Uses within Service Area .................................................................................................. 4-9 Water Use Characterization ............................................................................................................. 4-9 4.4.1 Past, Current, and Projected Water Use by Sector ................................................................. 4-10 4.4.2 Worksheets and Reporting Tables .......................................................................................... 4-15 4.4.3 Water Use for Lower Income Households ............................................................................... 4-15 4.4.4 Climate Change Considerations .............................................................................................. 4-17 SB X7-7 Baseline and Targets ....................................................................................................... 4-17 4.5.1 Wholesale Suppliers ................................................................................................................ 4-17 4.5.2 SB X7-7 Forms and Tables ..................................................................................................... 4-17 4.5.3 Baseline and Target Calculations for 2020 UWMPs ............................................................... 4-17 4.5.4 Service Area Population and Gross Water Use ...................................................................... 4-17 4.5.5 2020 Compliance Daily Per-Capita Water Use (GPCD).......................................................... 4-18 4.5.6 Regional Alliance ..................................................................................................................... 4-19 Water Supply Characterization ....................................................................................................... 4-19 4.6.1 Water Supply Analysis Overview ............................................................................................