Marquette-en-Ostrevant Wastewater Treatment Plant | Hauts-de-France, France

The Marquette-en-Ostrevant wastewater treatment plant is located in the Hauts-de-France region of northern France, serving the commune of Marquette-en-Ostrevant near Valenciennes. This facility provides advanced treatment for a population of approximately 4,250 residents, reflecting its role in managing municipal wastewater for this small agglomeration. As an advanced treatment plant, it goes beyond secondary treatment to remove nutrients and other pollutants, meeting stringent French and European standards. The plant has a designed capacity of 2,250 m³/day and currently treats an average daily flow of 758.19 m³. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), agglomerations of this size (under 10,000 population equivalent) require appropriate treatment, and advanced treatment aligns with sensitive area requirements. The plant discharges treated effluent into local watercourses that ultimately drain into the Scheldt River basin, flowing through northern France and Belgium toward the North Sea. By providing advanced treatment, the facility helps protect downstream aquatic ecosystems and supports water quality in the region's dense river network.

The plant discharges into the Scheldt River basin, which flows through the Hauts-de-France region and into Belgium before reaching the North Sea near Antwerp. This basin supports diverse freshwater habitats and is an important migratory corridor for fish. Advanced treatment reduces nutrient loading, helping to prevent eutrophication in downstream waters and the coastal zone.