PRANGINS Wastewater Treatment Plant, Prangins, Vaud, Switzerland

The PRANGINS wastewater treatment plant serves the municipality of Prangins in the canton of Vaud, Switzerland. Located near the shores of Lake Geneva, this facility provides advanced treatment for a population equivalent of 2,155, with a designed capacity of 3,600 m³/day and an average daily discharge of 978.20 m³/day. As an advanced treatment plant, PRANGINS goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is critical for protecting the sensitive ecosystem of Lake Geneva. Swiss wastewater treatment plants are regulated under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates stringent effluent standards for all plants discharging into lakes and rivers. The treated effluent from PRANGINS is discharged into Lake Geneva (Lac Léman), one of the largest freshwater lakes in Western Europe. The lake drains via the Rhône River into the Mediterranean Sea. The plant's advanced treatment helps prevent eutrophication and maintains water quality for drinking water, recreation, and aquatic life in the lake.

PRANGINS discharges into Lake Geneva, a large alpine lake that flows into the Rhône River and ultimately the Mediterranean Sea. The lake supports diverse aquatic life, including the endemic Lake Geneva whitefish, and is a critical drinking water source for the region. Advanced treatment at this plant helps control nutrient loading, reducing the risk of algal blooms and preserving the lake's ecological balance.