625 ILCS 45/8-1
The provisions of this Act, and of other applicable laws of this State shall govern the operation, equipment, numbering and all other matters relating thereto whenever any vessel shall be operated on the waters of this State, or when any activity regulated by this Act shall take place thereon; but nothing in this Act shall be construed to prevent the adoption of any ordinance or local law by any political subdivision of the State relating to operation and equipment of vessels the provisions of which are not inconsistent with the provisions of this Act, amendments thereto or regulations issued thereunder: Provided, that such ordinances or local laws shall be operative only so long as and to the extent that they continue to be not inconsistent with the provisions of this Act, amendments thereto or regulations issued thereunder.
625 ILCS 45/8-1