225 ILCS 305/39

It is declared to be the public policy of this State, pursuant to paragraph (h) of Section 6 of Article VII of the Illinois Constitution of 1970, that any power or function set forth in this Act to be exercised by the State is an exclusive State power or function. Such power or function shall not be exercised concurrently, either directly or indirectly, by any unit of local government, including home rule units, except as otherwise provided in this Act. This is a limitation of home rule powers.