NANTEUIL LE HAUDOUIN Wastewater Treatment Plant, Hauts-de-France, France

The NANTEUIL LE HAUDOUIN wastewater treatment plant is located in Nanteuil-le-Haudouin, a commune in the Oise department of Hauts-de-France, France. The plant serves a population of 4,631 and has a designed capacity of 9,500 cubic meters per day, with an average discharge volume of 826.16 cubic meters per day. As an advanced treatment facility, the plant goes beyond secondary treatment to remove nutrients and other pollutants, meeting stringent French and European standards. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size are required to provide secondary treatment, but the plant's advanced level reflects local environmental sensitivities or regulatory requirements. The treated effluent is discharged into local watercourses that eventually drain into the Seine River basin and ultimately the English Channel. The plant plays a key role in protecting the region's water quality and supporting aquatic ecosystems in the downstream environment.

The plant discharges into local streams that are part of the Seine River basin, which flows through Paris and into the English Channel. This watershed supports diverse aquatic life and is important for migratory fish species. Advanced treatment helps reduce nutrient loading, protecting downstream water bodies from eutrophication.