Amends the Illinois Municipal Code. Provides that, before the sale of a water system or sewer system owned by a municipality to a private entity, a referendum shall be submitted to the electors of the municipality. Provides that a majority vote authorizing the sale of the water system or sewer system shall be required from the electors of the municipality before the sale or purchase can occur. Amends the Public Utilities Act. In provisions concerning valuation of water and sewer utilities, provides that "water or sewer utility" means any of the following: (1) a public utility that regularly provides water or sewer service to 6,000 or fewer customer connections; (2) a water district, including, but not limited to, a public water district, water service district, or surface water protection district, or a sewer district of any kind established as a special district under the laws of the State that regularly provides water or sewer service to 6,000 or fewer customer connections; (3) a waterworks system or sewerage system established under the Township Code that regularly provides water or sewer service to 6,000 or fewer customer connections; (4) a water system or sewer system owned by a municipality that regularly provides water or sewer service to 6,000 or fewer customer connections; or (5) any other entity that is not a public utility that regularly provides water or sewer service to 6,000 or fewer customer connections. Provides that the provisions are repealed on June 1, 2026 (rather than June 1, 2028). Effective immediately.