The wastewater system of the City consists of sanitary sewers, pumping stations, force mains and a wastewater treatment plant, the locations of which are shown upon plans and drawings filed in the office of the Administrator of the Water/Sewer Department, and all other appurtenances which are used in whole or in part in connection with the collection, treatment and disposal of wastewater; and all other extensions, additions and improvements which may be made to such system. Its purpose is to provide for the collection and treatment of domestic wastewater and such industrial wastewaters as are permitted by this chapter and in coordination with Chapter 929, in order to protect the health, safety and general welfare of the residents of the City. The purpose of this chapter is to protect the wastewater collection and treatment facilities by controlling the quantity, quality and manner of discharge of wastewater into the wastewater system; and to satisfy existing requirements of the State and Federal Environmental Protection Agencies. The chapter shall apply to the City and to persons outside the City within the service area who are, by contract or agreement with the City, users of the City wastewater system.