70 ILCS 1205/8-11
In addition to the other powers and authority now possessed by it, every park district shall have the power to grant licenses, easements, and right of ways to municipalities, corporations or persons for the construction, operation and maintenance of facilities upon, under or across any property of such district for water, sewer, telephone, electric, gas or other public service, subject to such terms and conditions as may be determined by the district.
To all municipalities lying within the limits of any park district is hereby expressly reserved the right to lay and repair water and sewer pipe under the surface of any boulevard or park therein in the same manner and to the same extent it could have been done before the organization of such park district; provided, said property shall be restored to original condition by said municipality on completion thereof.
70 ILCS 1205/8-11