55 ILCS 5/5-15009
The county board shall have the power to acquire land for any and all of the purposes herein specified by this Division, and adopt and enforce ordinances for the necessary protection of sources of water supply and shall also have power to build dams and reservoirs for the storage of water, sink wells, establish intakes and water gathering stations, build water purification works, pumping stations, conduits, pipe lines, regulating works and all appurtenances required for the production, development and delivery of adequate, pure and wholesome water supplies into the distribution systems of incorporated cities and villages and corporations and individuals in unincorporated areas and is further empowered to build, operate and maintain such works when and where necessary and to sell water to said incorporated cities and villages and said corporations and individuals not in incorporated cities and villages, by meter measurements and at rates that will at least defray all fixed, maintenance and operating charges. Profits may be used for the extension and improvements of the water works system but not for any other function enumerated herein.
For the purpose of acquiring, constructing, extending or improving any waterworks system, sewerage system or combined waterworks and sewerage system, or for waste management, under this Division, or any property necessary or appropriate therefor, any county has the right of eminent domain within such county as provided by the Eminent Domain Act .
55 ILCS 5/5-15009