(A) Any prepayment or overpayment of charges may be retained by the city and applied on subsequent monthly charges.
(B) If a monthly service charge is not paid when due, then a penalty of 10% shall be added thereto.
(C) In the event a user fails to pay his or her water user fee within a reasonable time following discontinuance of service (a time period not to exceed 90 days), the fee shall be certified by the City Manager and assessed against the property on which the charges have incurred, and forwarded to the County Auditor for collection.