Groundwater Sustainability Plan

The Groundwater Sustainability Plan for the Sonoma Valley Groundwater Subbasin (GSP) was submitted to the California Department of Water Resources in January 2022 and approved by DWR on January 26, 2023.  The GSP establishes a standard for sustainability of groundwater management and use, and determines how the basin will achieve this standard by 2042. The GSP and the letter of determination from DWR can be viewed below.

Individual Sections and Appendices

Cover, Acknowledgements, Glossary, Abbreviations and Acronyms
Executive Summary
Table of Contents
Section 1 – Introduction
Section 2 – Plan Area
Section 3 – Basin Setting
Section 4 – Sustainable Management Criteria
Section 5 – Monitoring Plan
Section 6 – Projects and Management Actions
Section 7 – Implementation Plan
Section 8 – References

Appendices

• Appendix 1-A: Comments Received on Sonoma Valley Groundwater Sustainability Plan
• Appendix 1-B: Resolution Forming the Sonoma Valley Groundwater Sustainability Agency
• Appendix 1-C: Board and Advisory Committee Members
• Appendix 1-D: Advisory Committee Charter
• Appendix 1-E: Board and Advisory Committee meetings
• Appendix 1-F: Community Engagement Plan
  • Appendix 1-F-1: Consideration of Interests
    Appendix 1-F-2: Other Interested Parties
• Appendix 1-G: Stakeholder Assessment Report
• Appendix 3-A: Water Year Type Classification for Sonoma Valley, Santa Rosa Plain, and Petaluma Valley
• Appendix 3-B: Groundwater Monitoring Well Hydrographs
• Appendix 3-C: Detailed Analysis of Short-Term and Seasonal Groundwater-Level Trends
• Appendix 3-D: Detailed Analysis of Interconnected Surface Water Based on Shallow Well Data
• Appendix 3-E. Sonoma Valley Integrated Groundwater Flow Model (SVIGFM); Modifications for Use in the Development of the Groundwater Sustainability Plan for the Sonoma Valley Groundwater Subbasin
• Appendix 3-F: Future Groundwater Demands and Land Use Changes
• Appendix 3-G: Selection of Global Circulation Model for Climate Change Projections
• Appendix 4-A: Preliminary Minimum Thresholds and Measurable Objectives for Shallow and Deep Aquifer System (add in from below)
•  Appendix 4-B: Definition of Drought for Sonoma County Groundwater Sustainability Plans
• Appendix 4-C: Interconnected Surface Water Practitioners Working Group Key Themes and Outcomes
• Appendix 4-D: Development of Sustainable Management Criteria for Depletion of Interconnected Surface Water by Groundwater Pumping Sonoma Valley GSP
• Appendix 5-A: Monitoring Protocols
• Appendix 5-B: Comparative Hydrographs – Chronic Lowering of Groundwater Levels Representative Monitoring Points
• Appendix 6-A: Simulation of Projects and Management Actions for the Sonoma Valley Groundwater Sustainability Plan
• Appendix 6-A-1: Simulated Waterlevel Hydrographs from the Simulation of Projects and Management Actions
• Appendix 7-A: Model Maintenance and Improvements for the Sonoma Valley Groundwater Sustainability Plan