Dunsborough Wastewater Treatment Plant, Anniebrook, Western Australia

The Dunsborough wastewater treatment plant is located in Anniebrook, within the City of Busselton, Western Australia. It serves a population of approximately 6,858 people, placing it in the small to medium agglomeration category. The plant is operational and plays a key role in managing municipal wastewater for the Dunsborough area. As an Australian facility, the plant operates under state and national environmental regulations, including the Western Australian Environmental Protection Act and the National Water Quality Management Strategy. For a plant of this scale, secondary treatment is typically required, with additional nutrient removal if discharging to sensitive environments. The treated effluent is discharged into the local watershed, which ultimately drains to the Indian Ocean via the Geographe Bay area. The region supports diverse marine life and is an important area for tourism and recreation. Proper treatment helps protect coastal water quality and the ecological health of the bay.

The plant discharges into the local watershed that flows into Geographe Bay, part of the Indian Ocean. This coastal environment supports seagrass meadows and diverse marine species, including migratory fish and crustaceans. Maintaining low nutrient levels in the discharge is critical to prevent algal blooms and protect the bay's ecological balance.