The city may refuse to serve two or more users that are served through one meter. If more than one user is connected to a single meter, each user shall be charged the monthly minimum charge for the size of meter installed, provided, however, any month when the number of gallons of water shall exceed four thousand five hundred (4,500) gallons, the monthly charge for such excess as provided in Section 13.04.270 shall be divided equally among the users connected to the single meter. (Prior code § 3.710)