PRAZ sur ARLY MEGEVE Wastewater Treatment Plant, Praz-sur-Arly, France

PRAZ sur ARLY MEGEVE is a wastewater treatment plant located in Praz-sur-Arly, a commune in the Haute-Savoie department of the Auvergne-Rhône-Alpes region, France. The plant serves a population of around 29,383, placing it in the medium agglomeration category under EU classification. As a French plant, it 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 discharge enters a sensitive area, such as a lake or river used for drinking water abstraction. The plant's treated effluent is discharged into the local watershed, likely the Arly River, which flows into the Arve River and eventually the Rhône River. The Rhône drains into the Mediterranean Sea, making the plant's performance important for downstream water quality in both the river system and the coastal environment.

The plant discharges into the Arly River, a tributary of the Arve River, which joins the Rhône River near Geneva. The Rhône flows through southeastern France into the Mediterranean Sea. The watershed supports diverse aquatic life and is used for recreation and agriculture. The region's alpine terrain means the river system is sensitive to nutrient loading, which can affect downstream ecosystems.