Boundary traps and inspection shafts

We have specific requirements for connection to our sewer system which may require the installation of a boundary trap connection and inspection shaft.

Boundary traps

Are required when:

  • Connections to sewer mains are greater than or equal to 300mm.
  • Properties connected to a sewer main directly affected by a pumping or rising main, must include a boundary trap and a minimum of 100mm in-duct vent.
  • Within historical boundary trap areas.
  • Where it is a trade waste requirement to discharge to sewer via a boundary trap.
  • Where a hydraulic assessment review has directed the installation of a boundary trap.

Inspection shafts

The sewer inspection shaft is installed by the licensed plumber/drainer engaged by the property owner to carry out the works on the sanitary drainage connection of the development.

The sewer inspection shaft is part of the private sanitary drainage system and therefore providing access to the sewer inspection shaft, and all maintenance is the responsibility of the property owner.

Did you know?

When replacing a shaft in a boundary trap area the sewer shaft must consist of an approved boundary trap and induct vent. The inspection opening immediately downstream of the boundary trap is recommended to be extended to finished surface level and terminated with an air tight removable lid for maintenance purposes.

Thirsty for more advice?

If you need more advice on the installation of a boundary trap connection and inspection shaft, get your questions answered by contacting our Technical Services team.