The council shall regulate and change the monthly service charges as necessary to meet the obligations of the city for the city wastewater system. The service charge may vary based on the city wastewater disposal system to which connection has been made. Any increase in monthly wastewater service charges shall follow the procedure set forth in A.R.S. Section 9-511.01, as amended from time to time. Service charges shall begin at the time of connection to the system. Users shall be billed monthly thereafter, whether or not the building is occupied. [Code 2006 § 13-6-1. Ord. 2009-04, 4-14-2009; Ord. 2014-06 § 1, 5-27-2014; Res. 2014-10 Exh. A, 5-27-2014].