Over and above the charges established by Section 941.03, there may be established in special instances, and upon special agreement between the City and the owner of any lot, parcel of land, or premises served by the system, additional charges for industrial wastes of unusual strength of composition which are accepted by the City for treatment as may be determined to be fair and equitable. Each special agreement and the charges established thereby shall not become effective until ratified by ordinance duly passed by the Council of the City.
(1979 Code 53.04)