YVORNE Wastewater Treatment Plant, Roche (VD), Vaud, Switzerland

YVORNE is a wastewater treatment plant located in Roche (VD), in the canton of Vaud, Switzerland. It serves a population of approximately 7,225 people, classifying it as a small to medium agglomeration under Swiss and EU regulatory frameworks. The plant is situated near the eastern shore of Lake Geneva, a major Alpine lake that drains into the Rhone River. Under the Swiss Water Protection Act (Gewässerschutzgesetz), wastewater treatment plants of this scale are required to meet stringent standards, typically including mechanical and biological treatment with nutrient removal to protect sensitive water bodies. Swiss regulations mandate that plants serving over 2,000 population equivalents achieve at least secondary treatment with phosphorus removal. The treated effluent from YVORNE likely discharges into a local watercourse that flows into Lake Geneva (Lac Léman), one of the largest freshwater lakes in Western Europe. Lake Geneva is a critical ecological resource, supporting diverse aquatic life and providing drinking water for millions. The lake drains via the Rhone River into the Mediterranean Sea, making the plant's operations important for downstream water quality in both the lake and the Rhone basin.

YVORNE discharges into the Lake Geneva watershed, which feeds the Rhone River and ultimately the Mediterranean Sea. Lake Geneva is a deep, oligotrophic lake that supports a unique ecosystem including endemic fish species and migratory birds. The plant's nutrient removal is crucial to prevent eutrophication in the lake, which is a sensitive water body under Swiss regulations.