common internal sewerage piping

"common internal sewerage piping" means the pipes, private connection pipes, channels, conduits or similar structure, fixtures and other apparatus for the conveyance of sewage within or from more than one premises but under the common management and maintenance of owners or occupiers or a management corporation of the premises serviced by the internal sewerage piping up to the point of connection to a sewer, sewage treatment works or a septic tank or up to such other point of connection as may be determined by the Commission, but does not include the sanitary system in a building;
ACT 655 - WATER SERVICES INDUSTRY ACT 2006
2. Interpretation.