Sewer relining

An ongoing project to renew aging wastewater pipes.

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Project goal:

Reline old wastewater pipes to protect the local wastewater system, homes and environment.


In construction

Delivery Date:


What is sewer relining?

Sewer relining is an ongoing program to renew ageing wastewater pipes. The work is carried out by our authorised contractor, Interflow, to ensure our central wastewater system continues to be safe and reliable. Where possible, pipes are relined using trenchless technology. This method has a lower impact on existing infrastructure and local community as there is no need to excavate to replace pipes. Refer to the third tab, How does it work, for the steps taken to complete sewer relining.

Current work areas

Refer to the second tab above for potential impacts to nearby residents. 

Who can I contact?

Refer to the relevant current work area link for your project team contact.

Take our survey

Have we recently relined wastewater pipes in your area?

We appreciate your feedback and would like you to help us by completing a short, 2 minute Sewer Relining survey.

Just by letting us know your thoughts, you will automatically go into a draw to win a $50 gift card.

Work activities  

Nearby residents may notice more activity in the area, noise from generators and vehicles and temporary odour. Work will be approved in advance by your local government authority.

Where required, traffic management will be in place to direct people safely around the work area. Generally, we will be in one area for no more than 6 days at a time as we progress work along the wastewater route.

Access to property 

Interflow may require access to your property and will contact you directly to discuss the work and arrange entry. We will only require access to your back or front yard and will not need to enter your home.

During the work

If you experience any odour in your bathroom, flush your toilet and pour water down the floor drain. Where possible, please close all toilet covers during this period.

If wastewater does overflow out of your toilet, notify Steve Thompson from Interflow on 0407 157 056 immediately. Interflow will attend to assess the issue and notify the Department of Health.

Sewer relining step 1

Pipes are checked via CCTV

To determine exactly what we need to do to fix them.

Pipes are cleaned

Sewer relining step 2

High pressure water is jetted through the pipes. It may cause some gurgling or splashing from your toilet. We therefore advise to keep the toilet lid down. If water does spurt out of the toilet, please contact the Interflow Manager immediately.

Sewer relining step 3

Pipes are relined

A plastic strip is wound into the old pipe by a machine to form a new pipe.

Sewer relining step 4

New pipe is connected

Lateral lines are reconnected to the new pipe and junctions are sealed to protect the new pipe. This opens the connection to provide access to the system.

Sewer relining step 5

Pipes are checked 

This ensures that the job has been done properly. If we find any issues we'll come back and fix it. We may need to return to the area to repeat the above steps.

Boundary trap investigations and installations

diagram of boundary traps near house

Boundary traps are found a the point of connection to the central wastewater system and stop gases from entering private sewers. We may need to enter the boundaries of your property to complete this work. Installation involves small-scale excavation and we will reinstate any private property we disturb during this process.


Footage of a damaged pipe being relined at Beenyup Wastewater Treatment Plant.

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