United States Environmental Protection Agency’s (U.S. EPA) Data and Mapping

   Envirofacts is "...a single point of access to select U.S. EPA environmental data. This website provides access to several EPA databases to provide you with information about environmental activities that may affect air, water, and land anywhere in the United States. With Envirofacts, you can learn more about these environmental activities in your area or you can generate maps of environmental information."  U.S. Environmental Protection Agency
http://www.epa.gov/enviro/html/ef_overview.html

  Window to My Environment (WME) "...is a powerful U.S. EPA web-based tool that provides a wide range of federal, state, and local information about environmental conditions and features in an area of your choice. This application is provided by U.S. EPA in partnership with federal, state and local government and other organizations."  U.S. Environmental Protection Agency
http://www.epa.gov/enviro/wme/

  EnviroMapper gives you "...access to a wealth of environmental information on your desktop. EnviroMapper is a powerful tool used to map various types of environmental information, including air releases, drinking water, toxic releases, hazardous wastes, water discharge permits, and Superfund sites. Select a geographic area within EnviroMapper and view the different facilities that are present within that area. Create maps at the national, state, and county levels, and link them to environmental text reports."  U.S. Environmental Protection Agency
http://www.epa.gov/enviro/html/em/