From the California Integrated Waste Management Board http://www.ciwmb.ca.gov/
I have compiled a kml file containing all 2500 sites in their solid waste information system database. The description contains a link to more information in the SWIS database.

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The Solid Waste Information System (SWIS) database contains information on solid waste facilities, operations, and disposal sites throughout the State of California. The types of facilities found in this database include landfills, transfer stations, material recovery facilities, composting sites, transformation facilities, waste tire sites, and closed disposal sites.

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