San Diego Hydrogeology

Statistics as of 1/2014


  • Total study area: 3123 square miles
  • Offshore area: 622 square miles

USGS installed multiple-depth wells

  • 16 sites; 77 wells

Water-quality sampled since August, 2001

  • Surface-water sites: 49
  • Lake sites: 8
  • Spring sites: 1
  • Groundwater sites: 148
  • Total samples, about 3000 available in publicly accessible database. Most groundwater sites are sampled 1-2 times; some lake sites are sampled hundreds of times.

Previous statistics

Project Chief: Wes Danskin
Phone: 619-225-6132

Welcome to the United States Geological Survey (USGS) San Diego Hydrogeology project website, which provides geologic and hydrologic information for the transboundary San Diego–Tijuana area, USA and Mexico. This website provides background information about the project; a variety of news items; a large amount of data, in particular for USGS multiple-depth, monitoring-well sites; geologic and hydrologic models; and additional resources including photos, illustrations, and references. Last updated: April 2016

Some additional data may be available from the USGS database National Water Information System (NWIS).

Questions about San Diego Hydrogeology? Please contact Wes Danskin (email: or send a letter). 619.225.6132