Overview
Onkaparinga wastewater treatment plant serves 10,758 people in Willunga, Adelaide, South Australia. It is an operational facility located within 50 km of the coast.
The Onkaparinga wastewater treatment plant is located in Willunga, a suburb of Adelaide in South Australia, Australia. It serves a population of 10,758 and is part of the municipal wastewater infrastructure managed by the local authority. As a plant serving a medium agglomeration, it operates under Australia's national regulatory framework, which includes the National Water Quality Management Strategy and state-level Environment Protection Authority (EPA) guidelines. These regulations require appropriate treatment to protect receiving environments, typically secondary treatment for inland plants and enhanced treatment for coastal discharges. The plant's treated effluent is discharged into the local watershed, which ultimately drains to the Gulf St Vincent via the Onkaparinga River. The receiving waters support diverse aquatic life and are important for recreational and ecological values in the region.
Environmental context
The plant discharges into the Onkaparinga River catchment, which flows into Gulf St Vincent, a marine embayment of the Southern Ocean. The river and estuary provide habitat for migratory birds and fish species, and the coastal waters support seagrass meadows and reef ecosystems. The region's Mediterranean climate means seasonal flows influence dilution and assimilation capacity.
Frequently asked questions
The plant is located on Victor Harbor Road in Willunga, a suburb of Adelaide, South Australia, within the City of Onkaparinga council area.
The plant serves a population of 10,758 people in the Willunga area and surrounding parts of the City of Onkaparinga.
The treated effluent is discharged into the Onkaparinga River catchment, which flows into Gulf St Vincent. The plant operates under state EPA regulations to ensure the discharge meets water quality standards.
The plant operates under Australia's National Water Quality Management Strategy and South Australia's Environment Protection Act, with oversight from the EPA. These regulations set discharge limits to protect the receiving environment.
For medium agglomerations of this size, Australian standards typically require secondary treatment as a minimum, with additional nutrient removal if discharging to sensitive waters. The specific process depends on the plant's design and local EPA requirements.
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