POIX DU NORD SE Wastewater Treatment Plant, Poix-du-Nord, Hauts-de-France

POIX DU NORD SE is a municipal wastewater treatment plant located in Poix-du-Nord, a commune in the Nord department of the Hauts-de-France region, northern France. The plant serves a population of approximately 2,935, classifying it as a small agglomeration under French and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. With a designed capacity of 6,000 m³/day and an actual discharge volume of 523.60 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the Scheldt River basin, flowing through the region towards the North Sea. The plant plays a key role in protecting the water quality of the surrounding rivers and the downstream estuarine and marine environment.

The plant discharges into the Scheldt River basin, which flows through northern France and Belgium before reaching the North Sea via the Western Scheldt estuary. This basin supports diverse aquatic life and is an important migratory corridor for fish. The secondary treatment provided helps reduce organic pollution and nutrient loads, protecting the ecological health of the river and the downstream coastal zone.