1. The user charge ordinance, as adopted, shall be reviewed annually to determine the wastewater contribution of various classes of users, the total costs of operation and maintenance of the treatment works, and its approved user charge system, and annually revise the user charge rates for various classes of users in order to accomplish the following:

    a. Maintenance proportional distribution of operation and maintenance costs among users or user classes, and generate sufficient revenue to pay the total operation and maintenance costs necessary for the proper operation and maintenance (including replacement) of the treatment works;

    b. Apply any excess revenues collected from a class of users to the costs of operation and maintenance attributable to that class for the next year and adjust the rate accordingly.

    2. Each user shall be notified, at least annually, in a regular bill, of the rate and that portion of the user charge which is attributable to the costs of operation, maintenance, and replacements of the treatment works.  Annually, the city shall meet with the outside municipalities at least thirty days in advance of the implementation of the user charge ordinance.  (Ord. S-39109, 1979).