FREMONT BASIN INTEGRATED REGIONAL WATER MANAGEMENT PLAN FEBRUARY 2019 Prepared by the Regional Water Management Group of the Fremont Basin Integrated Regional Water Management Region Fremont Basin Integrated Regional Water Management Plan February 2019 Prepared by the Regional Water Management Group of the Fremont Basin Integrated Regional Water Management Region With assistance from Woodard & Curran Acknowledgements The Regional Water Management Group acknowledges the many working group members, representatives of agencies, non-governmental organizations, community members, and dedicated stakeholders for their participation in the development of this Integrated Regional Water Management Plan. In addition, we specifically acknowledge the California Department of Water Resources for their guidance and financial assistance in preparing this Plan. Fremont Basin Integrated Regional Water Management Plan Table of Contents Table of Contents ..................................................................................................................................................iii List of Appendices ............................................................................................................................................. viii List of Figures ...................................................................................................................................................... viii List of Tables .......................................................................................................................................................... ix List of Acronyms and Abbreviations.............................................................................................................. xi 1 Governance and Planning ...................................................................................................................... 1-1 1.1 Introduction ..................................................................................................................................................... 1-1 1.1.1 Integrated Regional Water Management Overview ................................................................ 1-1 1.1.2 Fremont Basin IRWM Region ............................................................................................................ 1-2 1.2 Governance ....................................................................................................................................................... 1-4 1.2.1 Regional Water Management Group .............................................................................................. 1-4 1.2.2 Governance Structure and Decision-Making .............................................................................. 1-5 1.3 Stakeholder Involvement ........................................................................................................................... 1-7 1.3.1 Stakeholder Involvement and Public Outreach ......................................................................... 1-7 1.3.2 Disadvantaged Community Outreach ..........................................................................................1-10 1.3.3 Native American Tribal Outreach .................................................................................................1-11 1.4 Regional Coordination ...............................................................................................................................1-12 1.4.1 Coordination with Neighboring IRWM Regions ......................................................................1-12 1.4.2 Coordination with State, Federal, and Local Agencies .........................................................1-14 1.5 IRWM 2018 Plan Development ..............................................................................................................1-15 1.5.1 Public Notices ........................................................................................................................................1-15 1.5.2 Stakeholder Meetings .........................................................................................................................1-15 1.5.3 DAC Outreach for Plan Development ..........................................................................................1-17 1.5.4 Media .........................................................................................................................................................1-17 1.5.5 Plan Adoption ........................................................................................................................................1-18 1.6 Technical Analysis .......................................................................................................................................1-18 1.7 Relation to Local Water and Land Use Planning .............................................................................1-19 1.7.1 Groundwater Management Plan ....................................................................................................1-20 1.7.2 Salt and Nutrient Management Plan ............................................................................................1-20 1.7.3 Urban Water Management Plans ...................................................................................................1-21 1.7.4 City and County General Plans .......................................................................................................1-21 iii Fremont Basin Integrated Regional Water Management Plan 1.7.5 Regional Conservation Plans ...........................................................................................................1-21 1.7.6 Stormwater Resource Plans ............................................................................................................1-22 1.8 Plan Update Process ...................................................................................................................................1-22 2 Region Description ................................................................................................................................... 2-1 2.1 Regional Overview ........................................................................................................................................ 2-1 2.1.1 Fremont Basin IRWM Regional Boundary ................................................................................... 2-1 2.1.2 Neighboring IRWM Regions .............................................................................................................. 2-3 2.2 Physical Setting ............................................................................................................................................... 2-5 2.2.1 Climate ........................................................................................................................................................ 2-5 2.2.2 Geology and Soils ................................................................................................................................... 2-8 2.2.3 Watersheds and Surface Water Features ...................................................................................2-10 2.2.4 Internal Boundaries ............................................................................................................................2-14 2.3 Sources of Supply and Infrastructure ..................................................................................................2-20 2.3.1 Water Agencies .....................................................................................................................................2-20 2.3.2 Imported Water Supplies .................................................................................................................2-22 2.3.3 Groundwater ..........................................................................................................................................2-23 2.3.4 Surface Water ........................................................................................................................................2-32 2.3.5 Wastewater and Recycled Water ..................................................................................................2-32 2.4 Water Quality ................................................................................................................................................2-34 2.4.1 Beneficial Uses ......................................................................................................................................2-34 2.4.2 Groundwater Quality ..........................................................................................................................2-37 2.4.3 Surface Water Quality ........................................................................................................................2-42 2.4.4 Imported Water Quality ....................................................................................................................2-42 2.4.5 Recycled Water Quality .....................................................................................................................2-43 2.5 Flood Control .................................................................................................................................................2-43 2.6 Environmental Resources ........................................................................................................................2-46 2.6.1 Critical