BEVAIX Wastewater Treatment Plant, La Grande-Béroche, Neuchâtel, Switzerland

The BEVAIX wastewater treatment plant is located in Bevaix, part of the municipality of La Grande-Béroche in the canton of Neuchâtel, Switzerland. It serves a population of approximately 4,492 residents, placing it in the small agglomeration category under Swiss wastewater management standards. As a Swiss plant, BEVAIX operates under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates appropriate treatment levels to protect water bodies. Plants of this scale typically employ mechanical-biological treatment with nutrient removal to meet stringent Swiss effluent standards. The plant discharges treated wastewater into the local hydrological network, which ultimately drains into Lake Neuchâtel, the largest lake entirely within Switzerland. This lake is a key ecological resource, supporting diverse aquatic life and serving as a recreational area. The plant's operation helps maintain water quality in the lake and downstream into the Aare River system.

The BEVAIX plant discharges into the local watershed that flows into Lake Neuchâtel, a large perialpine lake in western Switzerland. The lake is ecologically sensitive, supporting fish species such as whitefish and perch, and serves as an important stopover for migratory birds. Downstream, the lake drains via the Zihl Canal into the Aare River, which flows into the Rhine, ultimately reaching the North Sea. Protecting water quality in this chain is critical for both local biodiversity and downstream ecosystems.