220 ILCS 50/14
The regulation of underground utility facilities and CATS facilities damage prevention, as provided for in this Act, is an exclusive power and function of the State. A home rule unit may not regulate underground utility facilities and CATS facilities damage prevention, as provided for in this Act. All units of local government, including home rule units that are not municipalities of more than 1,000,000 persons, must comply with the provisions of this Act. To this extent, this Section is a denial and limitation of home rule powers and functions under subsection (h) of Section 6 of Article VII of the Illinois Constitution. A home rule municipality of more than 1,000,000 persons may regulate underground utility facilities and CATS facilities damage prevention.
220 ILCS 50/14