- Andrew W. Breidenbach Environmental Research Center (AWBERC) - Library located in Cincinnati, Ohio.
- Atmospheric Sciences Modeling Division Library - Provides information about the Library's collection, services, and policies. Located in Research Triangle Park, NC.
- Environmental Protection Agency - RTP Library - The EPA-RTP library offers access to the online catalog, the technology transfer network, EPA testing methods, and EPA publications.
- Environmental Science Center Library - Ft. Meade, MD - Includes descriptions of library contents by category. Library is the environmental reference source for the Environmental Science Center and the following states in Region 3: DE, Washington DC, MD, PA, VA, and WV.
- Environmental Sciences Division - Technical Research Center, Las Vegas, Nevada.
- Gulf Ecology Division Library - Gulf Breeze, Florida.
- Legislative Reference Library - Washington, DC. Includes copies or summaries of the legislation that created EPA and the statutes it enforces, Congressional Record summaries, and information on pending legislation.
- OPPTS Chemical Library - Office of Pollution Prevention and Toxics. Washington, DC.
- Region 8 Environmental Information Service Center - Serving Colorado, Montana, North Dakota, South Dakota, Utah and Wyoming. In Denver, Colorado.
- Region 1 Library - Serving Connecticut, Massachusetts, Maine, New Hampshire, Rhode Island and Vermont. In Boston, Massachusetts.
- Region 10 Library - Serving Alaska, Idaho, Oregon, the Puget Sound, and the state of Washington. In Seattle, Washington.
- Region 2 Library - Serving New York, New Jersey, Puerto Rico, and the US Virgin Islands. In New York, New York.
- Region 3 Library - Serving Maryland, Pennsylvania, Rhode Island, Virginia, and West Virginia. In Fort Meade, Maryland.
- Region 4 Library - Serving Alabama, Florida, Georgia, Kentucky, Mississippi, North Carolina, South Carolina and Tennessee. In Atlanta, Georgia.
- Region 5 Library - Serving Illinois, Indiana, Michigan, Minnesota, Ohio, and Wisconsin. In Chicago, Illinois.
- Region 6 Library - Serving the states of Arkansas, Louisiana, New Mexico, Oklahoma and Texas. In Dallas, Texas.
- Region 7 Library - Iowa, Kansas, Missouri, and Nebraska. In Kansas City, Kansas.
- Region 9 Library - Serving Arizona, California, Hawaii, Nevada, the Pacific Islands subject to U.S. law, and approximately 140 Tribal Nations. In San Francisco, California.
- Region 8 Technical Library - Serving Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming. In Denver, Colorado.
- Research Library for RCRA - Established by Region 1 as part of the Resource Conservation and Recovery Act (RCRA) Program. In Boston, Massachusetts.
- U.S. EPA Headquarters Information Resources Center - The EPA Headquarters Information Resources Center provides reference assistance to the public and EPA staff.
- U.S. EPA National Enforcement Investigations Center Library - This website contains information about the National Enforcement Investigation Center (NEIC) and its activities related to environmental enforcment. It also has information regarding the NEIC organization, highlights, library information sources and publications.
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