(70 ILCS 3710/5.3)
    Sec. 5.3. Billing for services.
    (a) On or after the effective date of this amendatory Act of the 100th General Assembly, a water service district:
        (1) shall bill for any utility service, including
    
previously unbilled service: (A) within 12 months after the provision of that service to the customer if the service is supplied to a residential customer; or (B) within 24 months after the provision of that service to that customer if the service is supplied to a non-residential customer; however, the water service district may bill for unpaid amounts that were billed to a customer or if the customer was notified that there is an unpaid amount before the effective date of this amendatory Act of the 100th General Assembly for service that was supplied to the customer before January 1, 2016;
        (2) shall not intentionally delay billing beyond the
    
normal billing cycle;
        (3) shall label any amount attributed to previously
    
unbilled service as such on the customer's bill and include the beginning and ending dates for the period during which the previously unbilled amount accrued;
        (4) shall issue the makeup billing amount calculated
    
on a prorated basis to reflect the varying rates for previously unbilled service accrued over a period of time when the rates for service have varied; and
        (5) shall provide the customer with the option of a
    
payment arrangement to retire the makeup bill for previously unbilled service by periodic payments, without interest or late fees, over a time equal to the amount of time the billing was delayed.
    (b) The time limit of paragraph (1) of subsection (a) shall not apply to previously unbilled service attributed to tampering, theft of service, fraud, or the customer preventing the utility's recorded efforts to obtain an accurate reading of the meter.
(Source: P.A. 100-178, eff. 8-18-17.)