Combremont Le Petit Wastewater Treatment Plant, Valbroye, Vaud, Switzerland

Combremont Le Petit is an advanced wastewater treatment plant located in the municipality of Valbroye, in the Vaud canton of Switzerland. It serves a small population of 599 residents, reflecting the rural character of the area within the Broye-Vully district. The plant is situated inland, more than 10 km from the coast, and operates under Swiss federal water protection regulations. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants, ensuring high-quality effluent. With a designed capacity of 1000 m³/day and an actual discharge volume of 271.9 m³/day, the plant operates well below its capacity, indicating room for future growth. Swiss regulations, aligned with the EU Urban Waste Water Treatment Directive, require advanced treatment for sensitive areas, which is consistent with the plant's configuration. The treated effluent is discharged into local watercourses that drain into the Broye River, a tributary of the Rhone basin. The Rhone ultimately flows into Lake Geneva and then the Mediterranean Sea. The plant plays a crucial role in protecting the Broye River and downstream aquatic ecosystems from nutrient pollution, supporting biodiversity and water quality in the region.

The plant's effluent enters local streams that feed into the Broye River, part of the Rhone basin. The Broye River flows through agricultural and rural landscapes before joining the Rhone, which empties into Lake Geneva and eventually the Mediterranean. The advanced treatment helps protect sensitive downstream waters from eutrophication, supporting diverse aquatic life and maintaining ecological balance in the region.