Any person or firm using Provo City culinary water, a part of which does not go into Provo City sewer system, may, at their own expense, and under the supervision of the Director, install a meter on their sewer line or design and construct their water system in such a way that a complete separation is made between the part of the system that empties into the sewer and that which does not go into the sewer, and install separate water meters on each part of the water system. Such users shall be charged for sewer service as set forth in this Title.