CHATEAU D OEX_L ETIVAZ Wastewater Treatment Plant, Château-d'Oex, Vaud, Switzerland

CHATEAU D OEX_L ETIVAZ is a wastewater treatment plant located in the alpine village of L'Etivaz, part of the municipality of Château-d'Oex in the canton of Vaud, Switzerland. The plant serves a small population of 135 residents and is situated in the scenic Pays-d'Enhaut region, known for its mountainous terrain and tourism. It operates under Swiss federal water protection regulations, which require appropriate treatment for all discharges into sensitive alpine watersheds. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. With a designed capacity of 317 m³/day and an actual discharge volume of 61.28 m³/day, the facility operates well below its capacity, indicating ample headroom for current demand. Swiss regulations for small agglomerations typically mandate secondary treatment, and the plant's performance aligns with these standards. The treated effluent is discharged into local streams that feed into the Sarine River, a tributary of the Aare River, which ultimately flows into the Rhine River and the North Sea. The alpine watershed is ecologically sensitive, supporting diverse aquatic life and providing critical habitat for species adapted to cold, oxygen-rich waters. The plant's secondary treatment helps protect downstream water quality in this pristine environment.

The plant discharges into local streams that drain into the Sarine River, a major tributary of the Aare River within the Rhine basin. The Rhine flows through several countries before reaching the North Sea. The alpine watershed is ecologically sensitive, supporting cold-water fish species such as brown trout and providing important habitat for aquatic invertebrates. The region's steep terrain and rapid runoff make water quality protection crucial for maintaining the ecological integrity of downstream rivers and lakes.