ALLONZIER LA CAILLE Wastewater Treatment Plant, Allonzier-la-Caille, France

The ALLONZIER LA CAILLE wastewater treatment plant is located in Allonzier-la-Caille, a commune in the Haute-Savoie department of the Auvergne-Rhône-Alpes region in southeastern France. The plant serves a population of approximately 17,518, classifying it as a medium-sized agglomeration under EU regulations. As a French facility, the plant operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are designated as sensitive areas. The plant's designed capacity is 1.00 (likely in thousands of cubic meters per day), indicating it is sized to handle the local population's wastewater. The plant discharges treated effluent into local watercourses that ultimately drain into the Rhône River basin. The Rhône flows southward through France into the Mediterranean Sea, supporting diverse aquatic ecosystems along its course. The plant plays a key role in protecting downstream water quality in the region.

The plant's treated effluent enters local streams that feed into the Rhône River basin. The Rhône is one of Europe's major rivers, flowing through the Lake Geneva region and eventually into the Mediterranean Sea. This watershed supports diverse aquatic life, including fish species such as trout and grayling, and provides water for agriculture and recreation. The plant's operation helps maintain water quality in this ecologically sensitive alpine region.