An ON-SITE WASTEWATER SYSTEM is defined as "Any system, which is domestic, commercial, private or public, that holds or /and treats or/and disposes of wastewater generated from activity on any property that is not connected to Council's reticulated services. This includes wastewater holding tanks and on-site wastewater treatment and application systems." It is more commonly referred to as a septic tank.
Septic tanks are subject to Porirua City bylaws. All septic tanks must be licensed and be subject to regular maintenance checks. Porirua City Council website has information on consent requirements Onsite Wastewater Systems
In response to a request from the Pauatahanui Residents Association, Council officers provided an update in response to queries about the licensing and maintenance requirements.
The booklet "The Story of Your Septic Tank" provides some valuable information.