Synopsis As Introduced Amends the Illinois Municipal Code. Provides that a municipal waterworks system, water supply system, or combined waterworks and sewerage system may not charge consumers for the provision of water service in an amount that is determined by a court to be unconscionably extreme or represents a gross disparity between the cost to the municipality of providing the water service and the cost charged to the consumer. Limits home rule powers. Amends the State Mandates Act requiring implementation without reimbursement. Effective immediately.