California's Groundwater Update 2025 (Bulletin 118)
Published by California Department of Water Resources
About this dataset
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.