On or before September 1 of each year, the City Engineer shall review the rules, regulations, charges, and fees set forth in this chapter. If changes, revisions, or modifications are necessary, the City Engineer shall submit to the City Manager the proposed revisions. If approved by the City Manager, the changes, revisions, and modifications shall be submitted to the first City Commission meeting in October for ratification by ordinance. The charge system contained in Section 933.25 shall be in accordance with the regulations of EPA, which now require:
(a) The user charges shall result in the distribution of operation, maintenance, and replacement costs of the treatment works within the jurisdiction of the city to each user class in proportion to the user's contribution of the total wastewater loading of the treatment works. Factors such as strength, volume, and delivery flow rate characteristics shall be included to ensure a proportional distribution of the costs.
(b) The charges shall be reviewed annually and revised periodically as required.
(c) The user charges shall derive revenue sufficient to meet all costs of operation, maintenance, and replacement of the system. (1980 Code 50.30)