LONGPERRIER Wastewater Treatment Plant, Longperrier, Île-de-France

The LONGPERRIER wastewater treatment plant is located in Longperrier, a commune in the Seine-et-Marne department of Île-de-France, France. It serves a population of approximately 5,050 people and is part of the region's municipal wastewater infrastructure. The plant is situated near Meaux and operates within the densely populated Paris metropolitan area. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 10,000 m³/day and a current discharge volume of 900.91 m³/day, the facility has significant spare capacity. Advanced treatment typically includes nutrient removal to protect sensitive receiving waters. The treated effluent is discharged into local water bodies that ultimately drain into the Seine River basin. The Seine flows through Paris and into the English Channel, supporting diverse aquatic ecosystems. The plant's advanced treatment helps reduce nutrient loads and protect downstream water quality in this ecologically important region.

The plant discharges into the Seine River basin, which flows through Île-de-France and eventually reaches the English Channel. The Seine supports a variety of fish species and is an important migratory corridor for eels and salmon. Advanced treatment at this plant helps minimize nutrient pollution, which is critical for preventing eutrophication in the river and coastal waters.