ROPRAZ Wastewater Treatment Plant, Ropraz, Vaud, Switzerland

ROPRAZ is an advanced wastewater treatment plant located in Ropraz, a municipality in the Vaud canton of Switzerland. The plant serves a small population of 406 residents and has a designed capacity of 950 cubic meters per day, with an actual discharge volume of 184.29 cubic meters per day. As an advanced treatment facility, ROPRAZ goes beyond secondary treatment to remove nutrients and other pollutants, ensuring high-quality effluent. Swiss wastewater treatment plants are regulated under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates strict standards for effluent quality to protect water bodies. The plant discharges into local waterways that eventually drain into the Broye River and then into Lake Geneva (Lac Léman), a major freshwater lake in Western Europe. The advanced treatment helps safeguard the lake's water quality, which supports diverse aquatic life and serves as a drinking water source for the region.

The plant discharges into the local watershed that flows into the Broye River, a tributary of Lake Geneva (Lac Léman). Lake Geneva is a large, deep lake that supports a rich ecosystem, including fish species like Arctic char and whitefish, and is an important migratory corridor for birds. The advanced treatment at ROPRAZ helps minimize nutrient loading and protects the lake from eutrophication.