Bulletin 118 - Update 2003

Update 2003 is a comprehensive report on groundwater published in 2003. It describes California’s groundwater basins and subbasins, including basin boundaries, hydrologic and hydrogeologic summaries, groundwater storage capacity and water budget, groundwater level and quality trends, well yields, basin management, and references. It also includes basin reports for each of the 515 groundwater basins that existed in 2003. The basin reports can be found here.