Where, in the judgment of the City Council, special conditions surrounding the use of City water to the extent that the application of the service charges, rates or rentals as specified herein would be inequitable and unfair to the City, the Council may establish a special rate applying to such contributors. Such special rates, when adopted by ordinance of the Council, shall apply to all contributors to the sanitary utilities of the City under like circumstances. Special rates may include, among others, the following cases:
A. Where the nature of the use of City water is such that the resulting sewage or industrial waste discharged into the sanitary sewer system of the City has characteristics making it more difficult to treat than ordinary domestic waste.
B. Where privately produced water supplies are discharged directly or indirectly into the sanitary sewer system of the City, the service charges, rates or rentals shall be on an equal basis as possible with the rates which are applied to an equal quantity and character of waste originating through the use of City water. (1975 Code § 7-2-10)