Illinois Environmental Health Association
- A state-wide, non-profit organization promoting environmental health through the mutual exchange of knowledge and experience through various disciplines.
- http://ieha.us

The Critical Trends Assessment Program
- Reports, protocols, and other information about and from an ongoing effort to access Illinois' major sources of standardized quantitative biological data on inventory and monitoring of forests, wetlands, grasslands, and streams.
- http://ctap.inhs.uiuc.edu

Keep Illinois Beautiful
- Works to improve the environment through education, public awareness, and community involvement.
- http://www.keepillinoisbeautiful.org/

Illinois Clean Coal Institute (ICCI)
- Research and development program with emphasis on continued utilization, environmentally clean burning, and new markets for Illinois Basin coals. News and events, research, and staff listing.
- http://www.icci.org/

The Conservation Foundation
- Non-profit land and watershed protection organization. Includes news, list of projects, and membership information.
- http://www.theconservationfoundation.org/

Illinois Society for Microbiology
- Promotes scientific knowledge in microbiology and supports the work of the American Society for Microbiology since 1935. Includes an events calendar, meeting locations, officers and committees, news, and membership levels.
- http://www.asm.org/branch/bril/page1.htm

ILCF - Illinois Conservation Foundation
- Preserves and enhances precious natural resources by supporting and fostering ecological, educational, and recreational programs. Includes program overviews, special events, donation forms, links, and contacts.
- http://www.ilcf.org/

Nature of Illinois, The
- Non-profit corporation that supports the state's scientific surveys (geological, natural history, and water) and the Waste Management & Research Center. Information on its quarterly publication, programs, and contacts.
- http://www.natureillinois.org/

Illinois Nature Preserves Commission
- Preserving, protecting, and defending the resources of Illinois for the benefit of the public. Also, offers support and resources for private landowners.
- http://dnr.state.il.us/inpc/

Illinois Mycological Association
- Promotes mycology, the study of fungi, through its member programs, services and events. Includes glossary, calendar, and photos.
- http://www.ilmyco.gen.chicago.il.us/

Illinois Environmental Protection Agency
- Information about permit application forms, vehicle emissions testing station locations, annual reports on the state's environmental conditions, the history and organizational structure of the Illinois EPA, and contact information.
- http://www.epa.state.il.us/

Illinois Drycleaner Environmental Response Trust Fund
- Established in response to requests by operators of retail drycleaning facilities to have financial resources available to pay for the cleanup of spills and/or leaks from their drycleaning machines and solvent storage units. Features details on its licens
- http://www.cleanupfund.org/

Flora and Fauna of Illinois
- State government information resources.
- http://dnr.state.il.us/conservation/naturalheritage/florafauna/

State Microscopical Society of Illinois
- Organization of amateur and professional microscopists. Information about monthly meetings, workshops, and other events, and how to join.
- http://www.smsi.org/

Illinois Environmental Compliance
- Periodical providing an independent source of environmental regulation, policy and enforcement data.
- http://www.compliancepublishers.com/iec/

Illinois Natural History Survey
- Extensive information on state flora and fauna, wetlands, ecological research, and related topics.
- http://www.inhs.uiuc.edu/

Illinois Solar Energy Association
- Seeks to provide education and resources through monthly meetings, sponsored events, expositions, and competitions. Site features educational articles, newsletter, rebate program information and links.
- http://www.iseanetwork.org/

Illinois State Geological Survey
- ISGS provides objective scientific information to government, business, and the public. Our research and service programs encompass geologic mapping, water and mineral resources, environmental and engineering geology, geochemistry, and education.
- http://www.isgs.uiuc.edu/

Illinois Environmental Council
- Promotes sound environmental policy and protections for land, air, water, wildlife, and human health in the State of Illinois. Provides programs of education, policy study, publication, and outreach for groups and individual members.
- http://www.ilenviro.org

Illinois Department of Natural Resources
- Find out what's new at the Department, learn its history, follow legislation, download applications for licenses or permits, purchase conservation merchandise, or just learn more about the world. Publications, museums, kids and education featured.
- http://dnr.state.il.us/