Altona Treatment Plant Diffuser Tank Project

The Altona Treatment Plant (ATP) treats close to 13 million litres of sewerage a day from more than 20,000 homes and businesses. 

Most of the wastewater captured at the plant is treated and used in manufacturing and for watering of golf courses and recreation reserves. Some of the wastewater from this process is discharged into Port Phillip Bay under strict regulatory conditions.

What is happening and when

To ensure that the plant continues to operate reliably and effectively, we are undertaking essential maintenance work on one of the three diffuser tanks.

This involves draining and cleaning the tank and replacing internal components.

Wastewater that would usually be stored in the tank will be temporarily stored within the treatment plant lagoon and treated wastewater will be discharged into Port Phillip Bay. 

If we delay the works, the treatment quality and wastewater discharged will continue to decline.

Work will commence Monday 4 October and take approximately 8-10 weeks to complete.


Project FAQs

Why this project is important?

Diffuser tanks are an essential part of the sewage treatment process – they help break down the waste. 

The membranes within each diffuser tank must be replaced when they reach end of life approximately every 10 years.  If they are not replaced, they are less effective and can result in reducing the quality of wastewater that is discharged into Port Phillip Bay.

We have carefully planned the work to reduce impacts on customers, people who live in or visit the area, and the environment.  

We’re working closely with marine and environmental experts to ensure the quality of treated water released from the plant into Port Phillip Bay continues to be within regulatory guidelines while works are underway.

Where is the location of the works?

The point where wastewater is discharged into Port Phillip Bay is 2.4km south-west of Altona Treatment Plant. 

Surrounding the discharge location are several parklands and recreational parks/ reserves, including the Cheetham Wetlands, Doug Grant Reserve and Laverton Creek.

Altona treatment map


What can you expect during the works?

We’re committed to minimising our impact on the community, businesses and the environment as we deliver our essential water and wastewater services.

During the work you may notice:

  • a small increase odour around the plant and near the discharge point. Deodorisers will be used to reduce this impact, and this poses no risk to human health.
  • increased construction activity at the plant.

These impacts will be carefully monitored by the project team, environmental specialists and consultants.

Coronavirus (COVID-19) and our works

To ensure the safety of our workers and the community, all active construction and maintenance sites operate in line with COVID Safe plans. We are continuing to closely monitor current information and advice about coronavirus in our community.

Visit Coronavirus (COVID-19) for more information on how we are responding to coronavirus.

More information

For more information about the project or to provide feedback please contact us using any of the following methods:

Project Manager
03 9313 7720
Email Aaron.

Community Engagement
03 9313 8439
Email Aimee.

13 44 99 (24/7)

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