615 ILCS 5/18i
Nothing in this amendatory Act of the 96th General Assembly shall be construed to diminish or conflict with the authority and the obligation of local governments to adopt and enforce local ordinances and regulations necessary to maintain eligibility to participate fully in the National Flood Insurance Program and for property owners to purchase federal flood insurance. If a local government located in an area that (i) is protected by a federal levee and (ii) located in a flood prevention district established in accordance with the Flood Prevention District Act chooses to participate in the National Flood Insurance Program, it must adopt and maintain ordinances and floodplain management regulations that meet the requirements of 44 C.F.R. 60.3, 60.4, and 60.5, and it must submit copies of those documents to the Federal Emergency Management Agency as required by federal law.
615 ILCS 5/18i