Every residential inhabitant within the corporate limits of the city, and every commercial or business entity or enterprise who may practically do so shall secure all of its potable water requirements from the water system owned by the city, connect to the sanitary sewer system owned by the city, and not otherwise dispose of sewage, unless it is impossible or not feasible to do so, and utilize the solid waste collection and disposal system offered by the city. (1991 Code § 16-2)