State and Federal Agencies

California Department of Water Resources

• Groundwater Information Center
• Sustainable Groundwater Management Page
• California Statewide Groundwater Elevation Monitoring (CASGEM) 
• California Department of Water Resources Water Data Library California Department of Water Resources
• California Department of Water Resources Groundwater Plan, Bulletin 118

State Water Resources Control Board

• Sustainable Groundwater Management Page
• On-line water quality database

US Geological Survey

• National Groundwater Page
• California Water Science Center
• California Groundwater monitoring – GAMA program
• Central Valley Hydrologic Model

Academia

• Stanford Water in the West Sustainable Groundwater Program
• UC Davis Groundwater Information and Educational Resources
• UC Agricultural Extension

NGOs

• Union of Concerned Scientists – Sustainable Groundwater Management in California
• Community Water Center – groundwater page
• California Water Foundation – publications