CA Dept. of Pesticide Regulation (home page)
http://www.cdpr.ca.gov/

CA Dept. of Pesticide Regulation (GWPA program)
http://www.cdpr.ca.gov/docs/gwp/

CA Dept. of Water Resources
http://www.water.ca.gov/

CA Dept. of Water Resources CIMIS Program
http://wwwcimis.water.ca.gov/cimis/welcome.jsp

CA State Water Resources Control Board
http://www.swrcb.ca.gov/

CA Universities:

University of CA Cooperative Extension - LAWR at UCDavis
http://lawr.ucdavis.edu/coopextn/

University of CA Agriculture and Natural Resources (ANR)
http://ucanr.org/

University of CA ANR Communications Services
http://anrcs.ucdavis.edu

Cal Poly, SLO Irrigation Training and Research Center
http://www.itrc.org

Fresno State University Center for Irrigation Technology
http://cati.csufresno.edu/cit/

UC IPM - Statewide Integrated Pest Management Program
http://ucipm.ucdavis.edu/