Drainage inspections
To ensure that below ground sanitary drainage work meets the relevant regulations, standards and codes, we conduct random inspections of plumbing work conducted on below ground sanitary drains. Each year a minimum of five per cent of all below ground drainage inspections booked with us, are randomly chosen for inspection.
What work requires a below ground sanitary drainage inspection?
You, the licensed plumbing practitioner, must book an inspection for all below ground drainage work, regardless of the cost, for the construction, installation or alteration of any below ground drain or associated gully.
Below ground drainage work includes:
- Connections of previously on-site sewerage treatment systems (mostly septic tanks) to reticulated sewerage systems
- New below ground sanitary drainage connections to the relevant sewerage authority's sewer connection point
- Sewerage connections on redeveloped sites to the relevant sewerage authority's sewer connection point
- All pre-slab drainage work and alterations on both new and renovation work
- Alterations to existing below ground sanitary drains
- Cut and seals of disused below ground sanitary drains or branches
- Urgent repairs to existing below ground sanitary drains (either where drain sections are replaced or where below ground sanitary drains are opened up for maintenance, other than the removal of a PVC inspection opening cap or cast iron inspection opening insert).
There are a number of requirements you must follow when booking a below ground sanitary drainage inspection.
What work does not require a below ground sanitary drainage inspection?
A below ground sanitary drain inspection does not need to be booked for:
- Installation of a septic tank and associated drains
- Below ground stormwater drainage work.

