El Caballo Resort Wastewater Treatment Plant, Wundowie, Western Australia

El Caballo Resort wastewater treatment plant is located in Wundowie, a town in the Shire of Northam, Western Australia. The facility serves a population of approximately 3,455 and operates with advanced treatment processes, ensuring high-quality effluent before discharge. As an advanced treatment plant, El Caballo Resort meets stringent Australian water quality standards. The plant discharges 893.87 megaliters of treated wastewater annually. Australian regulations for wastewater treatment are governed by state and national guidelines, with the Western Australian Department of Water and Environmental Regulation overseeing compliance. The treated effluent from the plant is discharged into the local environment, contributing to the region's water cycle. The plant's operations help protect downstream ecosystems, including the Avon River system, which flows into the Swan River and eventually the Indian Ocean. Advanced treatment reduces nutrient loads, supporting aquatic life and water quality in the catchment.

The plant discharges into the Avon River catchment, part of the Swan-Avon River system that flows through Western Australia's Wheatbelt region. This river system is ecologically significant, supporting diverse aquatic species and providing habitat for migratory birds. The treated effluent contributes to base flows in the river, which is important during dry periods. Downstream, the Swan River estuary meets the Indian Ocean at Fremantle, a sensitive coastal environment.