The following terms have the meanings indicated. Terms Defined. “Approving authority” means the local, county, or city health department. “Controlling authority” means a governmental body empowered by the county or municipality to provide for management, operation, and continuous preventive and corrective maintenance of a shared facility. “Shared facility” means a water or sewerage system which serves more than one lot of land or more than one user on a single lot of land with water or sewerage systems located on the individual lots or on parcels owned in common by the users or the controlling authority. “Users” means a single family residence, multi-residential unit, commercial unit, or equivalent of them, which is served by the shared facility.