Sewer connections & junctions

Here you will find information about sewer conversions and sewer junctions, including the application process and reporting lost junctions.

Converting from septic to sewer?

To connect your property to our wastewater system you need to engage a licensed plumber. You will also need to contact your local government's environmental health section before converting from a septic tank to a wastewater connection. They will advise if you need to decommission your old septic tank and the associated requirements.

Applying for a sewer conversion or connection

Your plumber can apply to connect to our main sewer via BuilderNet by selecting 'Lodge a sewer conversion application'.  

Plumbers wanting to connect to our wastewater system must also submit the necessary documentation to the Plumbers Licensing Board prior to carrying out the work.

On completion of the work, your plumber will be required to submit a 'Plumbing diagram' to the Building Commission.

How much will it cost?

The sewer connection fee can be found on our Sewer service fees page.

Submit your application now

Sewer junctions

Generally, when a sewer main passes a property a sewer junction will exist. However, this will not always be the case and a request for a new sewer junction may be needed.

In 2 lot strata schemes we encourage separate junctions to avoid potential disputes if the shared line is damaged or there is a blockage. Additionally to reduce the chances of plumbing being impacted by building activity, property sewer lines may need to be relocated to within 600 mm of the property boundary, in which case a second sewer junction may need to be cut in.  

Typical sewer connection for strata lots 

Typical sewer connection requirements for stratas diagram

How to apply for a sewer junction

You can apply to have a sewer junction cut in  by selecting 'Lodge a sewer application' in BuilderNet.

How much will it cost?

The fee for cutting in a sewer junction is based on the size of the sewer junction. In some cases, such as built up areas, this fee may need to be quoted. For information about our fees for cutting in new sewer junctions, please refer to our Sewer services fees page. 

What if I can't find an existing sewer junction?

When locating a sewer junction you may need to excavate at least 1 metre either side of the junction position and 600 mm deeper than the depth shown on the e-plan.

If you haven't been able to locate it, please report the lost junction to us on 13 13 95. When making the report, you will need to have current approval to connect to the sewer and the name of the licensed plumber responsible for the site.

How to report a lost junction

Lost junction reports must be made by a licensed plumber, who can confirm that the above instructions have been followed prior to making the report. If a junction is subsequently located within the above limits, we may seek to recover our costs from the licensed plumber responsible for the site.

What your plumber will need to do:

  • Safely secure the excavation site, pending resolution.

  • If the site cannot be secured, the excavation area will need to be back-filled. Take photos of the site before back-filling to support your lost sewer junction report.

When the report is made, we will provide a resolution date.

How to find the sewer connection point

When we process an application for a sewer conversion, we provide copies of a plan of the sewer (called an e-plan) to help locate the sewer connection point. To prevent damage it is important that the location and depth of the sewer connection point is confirmed before starting work (in particular if the connection is long or 'in and up'). Measurements are provided on the e-plan.

Providing as constructed information for a new cut in junction

Plumbers must follow the steps below when providing as constructed information for a new sewer junction.

  • A licensed plumber excavates the sewer main, ensuring safe entry

  • Water Corporation installs an off take junction to the sewer main

  • Water Corporation measures the off take junction position, relative to the downstream access chamber or maintenance shaft. If we can't get a measurement, the off take junction will be located relative to the property boundaries.

  • Water Corporation records the measurements on a minor works as constructed - sewer work sheet.

  • If required, a licensed plumber constructs an extension or 'ins' and 'ups' and records the measurements on our As constructed sewer form. Refer to our guide on How to provide as constructed information.

  • Licensed plumber submits the completed form to Water Corporation.

More information

For further information, please contact us by one of the following options:

Email: building.services@watercorporation.com.au

Phone: 13 13 95