California’s Groundwater (Bulletin 118) is the State’s official publication on the occurrence and nature of groundwater in California. __The latest version of the report, California's Groundwater - Update 2020 was publicly released on November 16, 2021.__ The publication defines the boundaries and describes the hydrologic characteristics of California’s groundwater basins. California’s Groundwater also provides information on groundwater management and recommendations for the future. With the passage of the Sustainable Groundwater Management Act in 2014, California’s Groundwater now serves an additional role by providing Groundwater Sustainability Agencies with three critical pieces of information regarding groundwater basins: Critical Conditions of Overdraft, Basin Boundaries, and Basin Priority. Updates to California’s Groundwater will be released every five years starting in 2020. This dataset includes the latest update, historical publications and supporting documents for California's Groundwater

California's Groundwater: Bulletin 118 Updates (CalGW Updates) are California's foremost technical publications on groundwater in the state. The Department of Water Resources is legislatively mandated by Water Code Section 12924 to publish CalGW Updates every 10 years. This page includes the DRAFT publication of California's Groundwater: Bulletin 118 - Update 2025 (CalGW Update 2025). The Department of Water Resources released this draft publication on October 20th, 2025, opening a 45-day public comment period, and will hold a public webinar on November 4, 2025 to answer questions and solicit comments. Public comments can be emailed to CalGW@water.ca.gov and will be accepted through Friday, December 5, 2025. The draft publication contains a summary Highlights (available in English and Spanish) and 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. Also included in this draft release is an info-graphic summary of the ten hydrologic regions, showing regional groundwater at a glance (Chapter 7) and some draft appendices including: findings and recommendations that support the future management and protection of groundwater; a glossary of terms; reference materials; and an update on land subsidence in California. For more information on CalGW Updates, historical publications, and supporting information 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.

California's Groundwater Update 2020 (CalGW) is California's foremost technical publication on groundwater in the state of California. CalGW, formally known as Bulletin 118, is legislatively mandated by Water Code 12924 to be updated every 5 years by the California Department of Water Resources. This dataset includes the full publication of CalGW - Update 2020, a link to the new [California's Groundwater Live](https://sgma.water.ca.gov/CalGWLive/) platform and all supporting data used in the creation of the report which was finalized on November 16, 2021. CalGW - Update 2020 consists of an Executive Summary (Highlights) and seven chapters commonly referred to as the Statewide Report. Due to the large file sizes, the Update has been broken into multiple pdf documents for the ease of downloading these large files. For more information on California's Groundwater (Bulletin 118) including historical publications please visit [California's Groundwater (Bulletin 118) Open Data Page](https://data.cnra.ca.gov/dataset/california-s-groundwater-bulletin-118-archive).

California's Groundwater: Bulletin 118 Updates (CalGW Updates) are California's foremost technical publications on groundwater in the state. The Department of Water Resources is legislatively mandated by Water Code Section 12924 to publish CalGW Updates every 10 years. This page includes the DRAFT publication of California's Groundwater: Bulletin 118 - Update 2025 (CalGW Update 2025). The Department of Water Resources released this draft publication on October 20th, 2025, opening a 45-day public comment period, and will hold a public webinar on November 4, 2025 to answer questions and solicit comments. Public comments can be emailed to CalGW@water.ca.gov and will be accepted through Friday, December 5, 2025. The draft publication contains a summary Highlights (available in English and Spanish) and 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. Also included in this draft release is an info-graphic summary of the ten hydrologic regions, showing regional groundwater at a glance (Chapter 7) and some draft appendices including: findings and recommendations that support the future management and protection of groundwater; a glossary of terms; reference materials; and an update on land subsidence in California. For more information on CalGW Updates, historical publications, and supporting information 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.

California's Groundwater Update 2013: A Compilation of Enhanced Content for California Water Plan Update 2013 compiles and analyzes readily-available groundwater information to characterize California’s groundwater basins, aquifers, and well infrastructure.