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California's Groundwater Update 2025 (Bulletin 118)

Published by California Department of Water Resources | State of California | Catalog Last Checked: July 31, 2026 at 08:44 PM | Dataset Last Updated: March 12, 2026 at 06:18 PM
California's Groundwater: Bulletin 118 Updates (CalGW Updates) are a continuing series of California's primary technical publications on groundwater resources in the state. While the Department of Water Resources have previously published CalGW Updates, Water Code Section 12924 now mandates a 10-year publication cycle, effective 2025. This page includes the publication of California's Groundwater: Bulletin 118 - Update 2025 (CalGW Update 2025), which the Department of Water Resources released on March 12, 2026. The publication contains: + Summary Highlights (available in English and Spanish) + A detailed statewide report (Chapters 1 – 6), which features current knowledge of groundwater resources including information on the location, characteristics, use, management status, and conditions of the state’s groundwater + An info-graphic summary of the ten hydrologic regions, showing regional groundwater at a glance (Chapter 7) + Supporting resources including appendices, a factsheet (available in English and Spanish), a key topics index, and select datasets For more information on CalGW Updates, historical publications timeline, and supporting informational products that include the CalGW Live website and California’s Groundwater Semi-Annual Updates, please visit: https://water.ca.gov/programs/groundwater-management/bulletin-118. For questions or comments, please email CalGW@water.ca.gov.

Resources

28 resources available

  • California’s Groundwater Live

    URL
  • How to Use California's Groundwater - Update 2025

    PDF
  • California's Groundwater: Bulletin 118 - Update 2025 Hydrologic Region Summaries (Chapter 7)

    PDF
  • Ficha Informativa (Español)

    PDF
  • Agua Subterránea de California 2025: Boletín 118 - Puntos Sobresalientes (Español)

    PDF
  • Factsheet English

    PDF
  • California's Groundwater: Bulletin 118 - Update 2025 Highlights (English)

    PDF
  • Key Topics Index

    PDF
  • Appendix C: Methods and Assumptions

    PDF
  • California's Groundwater: Bulletin 118 - Update 2025 Statewide Report (Chapters 1 - 6)

    PDF
  • California's Groundwater: Bulletin 118 - Update 2025 Full Report (Chapters 1 – 7)

    PDF
  • Appendix D: Citations and Links

    PDF
  • Appendix F: Water Use Data

    XLS
  • Appendix G: Hydrologic Region, Basin, and County Data (Part 2: Basins)

    XLS
  • Appendix G: Hydrologic Region, Basin, and County Data (Part 1: Hydrologic Regions)

    XLS
  • Appendix G: Hydrologic Region, Basin, and County Data (Part 3: Counties)

    XLS
  • Appendix J: Projects and Management Actions

    PDF
  • Appendix A: Findings and Recommendations

    PDF
  • Appendix B: Glossary

    PDF
  • Appendix E: Hydrologic Region Basin Maps with Basin Tables

    PDF
  • Appendix H: California’s Groundwater Semi-Annual Updates

    PDF
  • Select Datasets: Chapter 1

    .ZIP
  • Select Datasets: Chapter 2

    .ZIP
  • Select Datasets: Chapter 3

    .ZIP
  • Select Datasets: Chapter 4

    .ZIP
  • Select Datasets: Chapter 5

    .ZIP
  • Select Datasets: Chapter 6

    .ZIP
  • Appendix I: Update on Land Subsidence in California

    PDF

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