PLESSIS BELLEVILLE LAGNY LE SEC Wastewater Treatment Plant, Ève, Hauts-de-France

PLESSIS BELLEVILLE LAGNY LE SEC is a wastewater treatment plant located in Ève, a commune in the Oise department of Hauts-de-France, France. The plant serves a population of around 13,867, placing it in the medium agglomeration category under French and EU regulations. It is situated inland, away from coastal areas, and its operations are integrated into the regional water management framework. As a French wastewater treatment 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 discharge enters sensitive areas. The plant's treatment processes and capacity are designed to meet these regulatory standards, ensuring compliance with national and European environmental norms. The treated effluent from the plant is discharged into local watercourses that ultimately drain into the Seine River basin, which flows into the English Channel. This downstream pathway highlights the plant's role in protecting the ecological health of the Seine watershed and the marine environment. The plant contributes to reducing nutrient loads and pollutants, supporting biodiversity in the region's rivers and coastal zones.

The plant discharges into the Seine River basin, which flows through northern France and empties into the English Channel. This watershed supports diverse aquatic life and is an important ecological corridor for migratory fish species. The plant's treatment helps mitigate eutrophication risks in the downstream estuary and coastal waters.