Producing recycled water

We produce high-quality Class A recycled water at our Eastern and Western treatment plants, following strict regulatory guidelines.

Key facts

  • our advanced treatment technologies remove more than 99.999% of pathogens from wastewater
  • we use a quality control process which is common throughout the food industry, called Hazard Analysis and Critical Control Points (HACCP)

Standards and guidelines

We follow several guidelines for producing recycled water, including those set by:

These have different approaches to regulating quality. Some, like EPA Victoria’s, specify classes of recycled water based on microbiological quality. Others, like the federal government’s Australian Guidelines for Water Recycling, require us to treat it to a standard that makes it safe for its intended use.

Production process

Each of our two treatment plants uses processes specially designed to suit the characteristics of the plant and the incoming wastewater.

Eastern Treatment Plant

The Eastern Treatment Plant is one of the few plants in the world that can treat all incoming wastewater to a standard suitable for reusing, rather than only a small percentage.

In 2012, it was upgraded to include an advanced tertiary treatment process, involving filters, ozone, ultraviolet light and chlorine.

Western Treatment Plant

The Western Treatment Plant was the first plant in Victoria to produce Class A recycled water. This process makes use of use of our existing lagoon system, which produces Class C water in 30 to 35 days.

To reach Class A standard, ultraviolet light and chlorine are used to further disinfect the water. Some of this is used to water crops, parks and gardens, whilst some is further processed to reduce its salt before it can be supplied to homes.


We frequently work with the water industry on projects investigating alternative water supplies, including new ways to produce and use recycled water. Examples include:

  • trialling ceramic membranes, which could produce water at lower cost
  • using field test kits to detect blue-green algae, which helps us quickly decide if recycled water can be safely supplied
Last updated:
30 October 2017