Derby Wastewater Treatment Plant - Advanced Treatment in Western Australia

Derby Wastewater Treatment Plant is located on Conway Street in Derby, a town in the Shire of Derby-West Kimberley, Western Australia. The plant serves a population of approximately 3,518 and operates with advanced treatment processes, ensuring high-quality effluent before discharge. The plant's advanced treatment level exceeds the secondary treatment standard typically required for inland or coastal facilities. As a coastal plant within 10 km of the ocean, it likely incorporates nutrient removal to protect marine ecosystems. The facility is operational and discharges an average of 910.22 megaliters per year. Treated effluent from the plant enters the local drainage system, which ultimately flows into the Indian Ocean via King Sound. The receiving environment supports diverse marine life, including mangroves and seagrass beds, making advanced treatment critical for ecological protection.

The plant discharges into the King Sound, a large tidal estuary that connects to the Indian Ocean. This area supports mangrove forests, seagrass meadows, and migratory shorebirds. Advanced treatment helps minimize nutrient loading and protects the sensitive coastal ecosystem from eutrophication.