Overview
Saint-Pourçain-sur-Sioule wastewater treatment plant serves 6,500 people in Auvergne-Rhône-Alpes, France. It operates under the EU Urban Waste Water Treatment Directive, which mandates secondary treatment for agglomerations of this size.
The Saint-Pourçain-sur-Sioule wastewater treatment plant is located in the commune of Saint-Pourçain-sur-Sioule in the Allier department of Auvergne-Rhône-Alpes, France. It serves a population of approximately 6,500 residents, classifying it as a small to medium agglomeration under French and EU regulations. As a plant serving between 2,000 and 10,000 population equivalents, it falls under the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment (biological treatment) for discharges into freshwater. The plant is situated inland, and its treated effluent is discharged into the Sioule River, a tributary of the Allier River, which flows into the Loire River and ultimately reaches the Atlantic Ocean. The plant plays a key role in protecting the water quality of the Sioule River and downstream ecosystems. The Allier River is known for its diverse aquatic life and is part of the Loire basin, one of Europe's last wild river systems. Proper treatment helps prevent eutrophication and maintains ecological balance in this sensitive freshwater environment.
Environmental context
The plant discharges treated wastewater into the Sioule River, which flows into the Allier River, a major tributary of the Loire River. The Loire basin is ecologically significant, supporting diverse fish species and migratory birds. The Allier is known for its gravel-bed dynamics and hosts populations of Atlantic salmon and European otter. Effective wastewater treatment is essential to prevent nutrient loading and preserve the river's natural habitat.
Frequently asked questions
The plant is located on Route de Saulcet in Saint-Pourçain-sur-Sioule, in the Allier department of Auvergne-Rhône-Alpes, France.
The plant serves approximately 6,500 residents, classifying it as a small to medium agglomeration under EU regulations.
The treated effluent is discharged into the Sioule River, which flows into the Allier River and then the Loire River, eventually reaching the Atlantic Ocean.
As a French plant serving over 2,000 population equivalents, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for freshwater discharges.
For agglomerations of this size, the EU directive mandates secondary treatment (biological treatment) to reduce organic matter and suspended solids, ensuring compliance with national water quality standards.
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