COLOMBIER Wastewater Treatment Plant, Colombier (VD), Vaud, Switzerland

The COLOMBIER wastewater treatment plant is located in Colombier (VD), a village in the district of Morges, Vaud, Switzerland. It serves a population of 1,122 and operates with advanced treatment technology, ensuring high-quality effluent. The plant has a designed capacity of 1,875.00 m³/day and currently discharges 509.30 m³/day of treated wastewater. As a Swiss facility, the plant operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates strict effluent standards. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive water bodies. The plant's capacity utilization is moderate, indicating room for future growth. The treated effluent is discharged into the local watershed, which ultimately drains into Lake Geneva (Lac Léman), one of the largest freshwater lakes in Western Europe. Lake Geneva is a vital ecological and recreational resource, supporting diverse aquatic life and serving as a drinking water source for the region. The plant's advanced treatment helps minimize nutrient loading and protect the lake's water quality.

The plant discharges into the local watershed that flows into the Morges River and then into Lake Geneva (Lac Léman). Lake Geneva is a deep, oligotrophic lake that supports a diverse ecosystem, including endemic fish species and migratory birds. The lake is also a critical drinking water reservoir for the region. Advanced treatment at the plant helps reduce phosphorus and nitrogen inputs, mitigating eutrophication risks and preserving the lake's ecological balance.