Dora Creek


Dora Creek_upgrade

The Dora Creek Wastewater Treatment Works (WWTW) serves the communities of:

  • Morisset
  • Bonnells Bay
  • Yarrawonga Park
  • Silver Water
  • Sunshine
  • Brightwaters
  • Morisset Park

It currently treats 3.1 megalitres of effluent per day and can handle wastewater from a population equivalent to 48,000 people.

Plant Operation

The Dora Creek WWTW provides secondary treatment of wastewater. The works is designed to remove nutrients (nitrogen), solids and pathogens.

Secondary treatment is provided utilising:

  • The sewage receives screening with an automatic mechanical screen, odour treatment with a soil bed filter and flow measurement at the inlet works.
  • Biological treatment is achieved in two extended aeration tanks with an intermittently decanted extended aeration (IDEA) process.
  • The decanted effluent flows into a large effluent balance dam.
  • The large retention time within the dam exposes the effluent to ultra violet light that results in a certain level of disinfection within the dam.

Biosolids are treated in two sludge lagoons.

Recycling & Reuse

All biosolids produced at the Dora Creek WWTW are beneficially used for mine site rehabilitation.

Screenings are dewatered and stored in industrial bins for removal off-site.

All treated effluent is reused at Eraring Power Station. The power station further treats the effluent using membrane technologies before using the recycled water as feedwater to its high pressure boilers.

Hunter Water recycles approximately 5091 megalitres per year. Learn more about our recycling and reuse initiatives.


The plant was built in 1994 to cater for an equivalent population of 24,000 people with all treated effluent pumped to Eraring Power Station for reuse.

By late 2008, the WWTW was fast approaching its capacity and needed an upgrade to ensure it continues to operate reliably and in the future and can cater for projected population growth within the Dora Creek WWTW catchment.

Improvement work began in late November 2008 and was completed in September 2010, finishing on time and on budget at a total cost of $32.4 million.

The work involved a combination of upgrades to existing process units, the construction of new ones and an extension of the existing effluent main from Eraring to the Toronto wastewater system.

As a result of the upgrade the recycled water capacity of the plant has been increased for Eraring Power Station.

The extension of the effluent main means that excess effluent that cannot be used by Eraring can now be transferred to Belmont Ocean Outfall as further growth occurs.

Dora Creek WWTW now caters for an equivalent population of 48,000 people, which will allow us to meet the future needs of the local community while continuing to maintain a high standard of treatment.