GENERAL GROUNDWATER LINKS

California Department of Water Resources (DWR) Groundwater Information Center

http://www.groundwater.water.ca.gov/

USGS answers the basic questions: "What is ground water?", How does water get into the ground?", "What is an aquifer?", "Who uses groundwater?, "How do you get water out of the ground?", and "Can we run out of ground water?"
http://water.usgs.gov/pubs/FS/OFR93-643/

USGS's "Ground Water and the Rural Homeowner" a good primer for people with wells.
http://water.usgs.gov/pubs/gip/gw_ruralhomeowner/html/pdf.html

Sustainability of Ground-Water Resources, U.S. Geological Survey Circular 1186
http://water.usgs.gov/pubs/circ/circ1186/pdf/circ1186.pdf

Ground-Water-Level Monitoring and the Importance of Long-Term   Water Level Data,  U.S. Geological Survey Circular 1217
   http://water.usgs.gov/pubs/circ/circ1217/pdf/circ1217_final.pdf
Ground Water and Surface Water - A Single Resource,  U.S. Geological Survey Circular 1139
   http://water.usgs.gov/pubs/circ/circ1139/pdf/circ1139.pdf
Basic Ground-Water Hydrology, U.S. Geological Survey Water   Supply Paper 2220
   http://water.usgs.gov/pubs/wsp/wsp2220/#pdf 
U.S. Geological Survey's Ground Water Resources Program, 2001, U.S. Geological Survey Fact Sheet 056-01 
   http://water.usgs.gov/ogw/pubs/fs01056/
Arsenic in Ground Water of the United States, U.S. Geological Survey
   http://co.water.usgs.gov/trace/arsenic/
Ground Water Studies, U.S. Geological Survey Fact Sheet     058-95
   http://water.usgs.gov/wid/html/GW.html  
 DWR Water Facts: Groundwater
   http://wwwdpla.water.ca.gov/publications/pubs/supply/gw/water_facts_6.pdf
   DWR Water Facts: Groundwater in Fractured Hard Rock
   http://wwwdpla.water.ca.gov/publications/pubs/supply/gw/water_facts_1.pdf
   Land Subsidence in the United States (USGS Circular 1182)
   http://water.usgs.gov/pubs/circ/circ1182/
Introduction to Groundwater 
   http://wwwdpla.water.ca.gov/cd/groundwater/intro.html
Groundwater Levels
   http://wwwdpla.water.ca.gov/cd/groundwater/gwlevels.html
 Conjunctive Use
   http://wwwdpla.water.ca.gov/cd/groundwater/conjunctiveuse.html
 Land Subsidence
   http://wwwdpla.water.ca.gov/cd/groundwater/landsubsidence.html