Infill Sewerage Program

The Infill Sewerage Program has enabled more than 95,000 households in metropolitan and regional areas of WA access to the central wastewater system.

What is the Infill Sewerage Program?

The infill sewerage program, which started in 1994, aims to reduce the potential for health and environmental issues by capturing and treating wastewater in a modern and safe way and also helps with the orderly modernisation and renewal of residential infrastructure.

The program includes projects in the following regions:

Infill Sewerage Program priorities are determined by the Minister for Water in accordance with public health, environmental and development criteria and are dependent on State Government funding.

Contact us for more information

How do infill sewerage systems and STED schemes work?

Infill sewerage is a system of buried pipes that takes wastewater away from residential properties for safe treatment and disposal. Once a property is connected to the central wastewater system, septic tanks and leach drains can be decommissioned.

Septic Tank Effluent Disposal (STED) schemes take wastewater that has already been treated in household septic tanks through a pipeline system, which is then pumped to an evaporation and infiltration disposal pond for further treatment. A STED scheme will allow existing leach drains to be decommissioned.

What will happen if it comes to my area?

We will consult with you well before any infill sewerage or STED scheme work begins in your area.

Community support is required for a STED scheme. We carry out a thorough community consultation process which includes a community information session held during the four week voting period. If more than 50 per cent of property owners in the project area object to the scheme, it cannot proceed.

Installing a wastewater system can be disruptive as it involves digging large trenches to lay the sewerage pipes. There may be some temporary inconvenience with access to your property and possible road detours. Contractors do their best to minimise noise, dust and access restrictions, but we ask for your patience and understanding while work progresses.

Should we require access to your property we will contact you prior to discuss your individual requirements.

We endeavour to carry out this work with minimal impact on the local community, and any areas impacted by our work will be reinstated to as close original condition as practically possible. 

How do I connect?

Once the central wastewater system is completed in your area you will need to arrange for a licensed plumber to connect your property to the sewer connection point.

We encourage you to connect as soon as possible and you need to connect within five years. Find a licensed Waterwise Plumber near you.

If you have a septic tank, please contact the health services section of your local council to find out about decommissioning requirements.

How much will it cost?

The cost of connecting to the wastewater system usually ranges from $1,500 to $3,500. This is subject to individual property requirements, such as depth and length of wastewater pipes and ground conditions.

Sewerage rates will be charged once the system is operational and we have notified you in writing of its availability. These rates will be charged whether or not you have connected to the system.

If you have a Pensioner Concession, State Concession, WA Senior or Commonwealth Senior Health Card, you may be eligible for rebates or concessions. Find out more about pensioner and concession discounts.