65 ILCS 5/11-136-6
Whenever such commission shall pass an ordinance for the construction or acquisition of any waterworks properties or sewer properties or improvements or extensions or mains, pumping stations, reservoirs or other appurtenances thereto, which such commission is authorized to make, the making of which will require that private property be taken or damaged, such commission may cause compensation therefor to be ascertained and may condemn and acquire possession thereof in the same manner as nearly as may be, as provided for the exercise of the right of eminent domain under the Eminent Domain Act . However, proceedings to ascertain the compensation to be paid for taking or damaging private property shall in all cases be instituted in the county where the property sought to be taken or damaged is situated.
65 ILCS 5/11-136-6