California Department of Toxic Substances Control (DTSC) Brownfield page
http://www.dtsc.ca.gov/SiteCleanup/Brownfields/

California Environmental Protection Agency Brownfields page
http://www.calepa.ca.gov/Brownfields/

U.S. Environmental Protection Agency Brownfields page
http://www.epa.gov/region09/waste/brown/

State Water Resource Control Board Brownfields page
http://www.swrcb.ca.gov/