ST PIERRE D ALBIGNY Wastewater Treatment Plant, Saint-Jean-de-la-Porte, France

ST PIERRE D ALBIGNY is a wastewater treatment plant located in Saint-Jean-de-la-Porte, within the Savoie department of the Auvergne-Rhône-Alpes region in France. The plant serves a population of approximately 5,866 people, classifying it as a small to medium agglomeration under European Union classification. It is situated in the Alpine foothills, an area characterized by mountainous terrain and numerous rivers. As a French plant serving fewer than 10,000 people, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires appropriate treatment based on the sensitivity of the receiving environment. For agglomerations of this size, secondary treatment is typically mandated unless the discharge is into a less sensitive area. It is expected to comply with national regulations derived from the directive. The plant discharges treated wastewater into the local watershed, which ultimately drains into the Rhône River basin. The Rhône is one of Europe's major rivers, flowing from the Alps to the Mediterranean Sea. The downstream environment includes ecologically sensitive areas that support diverse aquatic life, and the plant's operations contribute to protecting water quality in this important river system.

The plant's treated effluent enters the local hydrographic network, which flows into the Isère River, a major tributary of the Rhône. The Rhône River then continues to the Mediterranean Sea, passing through ecologically significant wetlands and deltas. The Alpine watershed is known for its high biodiversity, including fish species such as brown trout and grayling. Proper wastewater treatment is essential to prevent nutrient enrichment and maintain the ecological balance of these sensitive aquatic habitats.