70 ILCS 2405/7.1

Any sanitary district is authorized to acquire, by purchase or contract, sanitary facilities, including but not limited to drains, ditches, sewers, outlets and sewerage treatment plants, owned by any city, village or incorporated town within the limits of the sanitary district, upon such terms and conditions as may be agreed to with the corporate authorities of the city, village or incorporated town, and to thereafter maintain, operate, enlarge, reconstruct and repair any sanitary facilities so acquired.