Coleraine Wastewater Treatment Plant, Victoria | Secondary Treatment for Rural Community

The Coleraine wastewater treatment plant is located in the town of Coleraine, Victoria, Australia, within the Shire of Southern Grampians. It serves a small population of around 1,170 residents, reflecting its role as a rural community facility. The plant is situated inland, approximately 50 km from the coast, and operates under the regulatory framework of the Victorian Environment Protection Authority (EPA). As a secondary treatment facility, the plant provides biological treatment to reduce organic matter and suspended solids before discharge. The plant's discharge volume of approximately 303 megalitres per year indicates its operational scale. For small agglomerations in Australia, secondary treatment is standard, with compliance monitored through state-based discharge licenses. The treated effluent is discharged into the local catchment, which ultimately drains into the Glenelg River system. The Glenelg River flows through western Victoria and into the Southern Ocean near Nelson. The river supports diverse aquatic life, including native fish species, and is an important waterway for the region's agriculture and ecosystems.

The plant discharges into the Glenelg River catchment, which flows through the Glenelg Hopkins region and empties into the Southern Ocean. The river supports a range of native fish, including the endangered Glenelg freshwater spiny crayfish, and provides habitat for waterbirds. The surrounding area is primarily agricultural, so nutrient management from wastewater is important to prevent algal blooms and maintain water quality downstream.