IL HB4221

Extends existing municipal waterworks and sewerage billing requirements to home rule municipalities, which were previously exempt from these state regulations

Requires municipalities to bill residential customers within 12 months of service and non-residential customers within 24 months of service

Prohibits intentional delay of billing beyond normal billing cycles and requires previously unbilled amounts to be clearly labeled with the accrual period dates

Mandates payment arrangements for makeup bills, allowing customers to pay previously unbilled amounts over time equal to the billing delay period, without interest or late fees

Explicitly limits home rule powers under the Illinois Constitution, preventing home rule municipalities from billing utility customers in a manner inconsistent with these requirements