OGENS Wastewater Treatment Plant, Ogens, Vaud, Switzerland

OGENS is a municipal wastewater treatment plant located in the village of Ogens, within the District du Gros-de-Vaud in the canton of Vaud, Switzerland. The facility serves a small population of approximately 164 residents, reflecting its role in a rural community. As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant has a designed capacity of 383 m³/day and currently treats an average daily flow of 74.44 m³/day, indicating ample reserve capacity. Under Swiss water protection legislation (Gewässerschutzgesetz), small plants like OGENS are required to meet national standards for effluent quality, which align with the EU Urban Waste Water Treatment Directive for agglomerations under 2,000 population equivalent. The treated effluent is discharged into local streams that flow into the Broye river, a tributary of the Zihlkanal, which ultimately drains into Lake Neuchâtel. This water body is part of the Rhine basin, contributing to the larger hydrological network of Western Europe. The plant plays a key role in protecting the local aquatic environment from nutrient pollution.

The plant discharges into small watercourses that feed the Broye river, which flows into the Zihlkanal and then Lake Neuchâtel, one of the largest lakes in Switzerland. This lake is part of the Rhine basin and supports diverse aquatic life, including fish species such as perch and pike. The surrounding region is agricultural, so the plant helps prevent nutrient enrichment that could lead to algal blooms in downstream waters.