ST LAURENT SUR SEVRE La PArie Wastewater Treatment Plant, Saint-Laurent-sur-Sèvre, France

ST LAURENT SUR SEVRE La PArie is an advanced wastewater treatment plant located in Saint-Laurent-sur-Sèvre, in the Pays de la Loire region of France. The plant serves a population of 3,400 and has a designed capacity of 6,500 m³/day, with a current discharge volume of 606.55 m³/day. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. As a French facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment levels based on the sensitivity of receiving waters and population size. For a plant of this scale, advanced treatment is typically mandated in sensitive areas to protect water quality. The treated effluent is discharged into the local watershed, which ultimately drains into the Sèvre Nantaise river and then the Loire River, flowing into the Atlantic Ocean. The plant plays a key role in protecting downstream aquatic ecosystems and supporting the region's water quality objectives.

The plant discharges into the Sèvre Nantaise river basin, which flows into the Loire River and eventually the Atlantic Ocean. The Loire estuary is an ecologically significant area that supports diverse aquatic life, including migratory fish species. Advanced treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in downstream waters.