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This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »
U.S. EPA's work in Illinois is managed from our Region 5 office in Chicago. Learn more about EPA Region 5.
From the latest drinking water safety study to sole source designations, learn more about the latest updates in your state.
Environmental information on air, water, land, and other subjects important to Illinoisans.
All the information you need about events and public notices in your state.
