Mount Crosby Westbank Wastewater Treatment Plant, Chuwar, City of Brisbane

Mount Crosby Westbank is an operational wastewater treatment plant located at Allawah Road, Chuwar, in the City of Brisbane, Queensland, Australia. The plant serves a population of around 7,982 people, placing it in the small to medium agglomeration category for Australian wastewater infrastructure. As an Australian facility, the plant operates under the regulatory framework of the Queensland Department of Environment and Science, which issues Environmental Authorities (EAs) for wastewater discharges. Treatment standards are guided by the National Water Quality Management Strategy and the Queensland Water Quality Guidelines. For plants of this scale, secondary treatment is typical, with additional nutrient removal where required to protect sensitive receiving environments. The plant's treated effluent is discharged into the Brisbane River catchment, which flows into Moreton Bay and ultimately the Coral Sea. The Brisbane River is a major waterway in southeast Queensland, supporting diverse aquatic ecosystems and providing water for agricultural, industrial, and recreational uses. The plant plays a key role in protecting water quality in this urbanized catchment.

Mount Crosby Westbank discharges into the Brisbane River catchment, which flows into Moreton Bay and then the Coral Sea. The Brisbane River is a vital waterway for southeast Queensland, supporting fish populations, migratory birds, and estuarine habitats. Downstream Moreton Bay is a ecologically significant area with seagrass beds and mangrove forests that provide nursery grounds for marine species. The plant's operations help maintain water quality in this sensitive coastal environment.