South Boulder Wastewater Treatment Plant, Kalgoorlie, Western Australia

South Boulder wastewater treatment plant is located on Goldfields Highway in South Boulder, near Kalgoorlie, Western Australia. It serves a small community of 167 people and operates under secondary treatment, a standard level for small inland plants in Australia. The plant is part of the City of Kalgoorlie-Boulder's municipal infrastructure, providing essential wastewater services to this remote mining region. As a secondary treatment facility, South Boulder uses biological processes to reduce organic matter and suspended solids before discharge. Australian wastewater treatment plants serving small populations typically follow state environmental protection regulations, which require adequate treatment to protect local water resources. The plant's annual discharge volume of 43.20 megalitres reflects its small service area. The treated effluent from South Boulder is discharged into the local environment, likely into a dry creek bed or evaporation basin, as the region is arid with no permanent rivers nearby. The plant's inland location, over 50 km from the coast, means its discharge does not directly impact marine ecosystems. Instead, it contributes to the management of water resources in the Goldfields region, where water conservation is critical.

South Boulder plant discharges into the arid Goldfields region of Western Australia, where surface water is scarce and ephemeral. The treated effluent may flow into local drainage systems that eventually reach Lake Carey or other salt lakes in the internal drainage basin. This area supports unique arid-zone aquatic life adapted to intermittent flows and high salinity. The plant's secondary treatment helps protect these sensitive ecosystems from nutrient pollution.