Compans Wastewater Treatment Plant, Compans, Seine-et-Marne, France

The Compans wastewater treatment plant is located in Compans, Seine-et-Marne, in the Île-de-France region of France. It serves a population of about 2,100, classifying it as a small agglomeration under French and EU regulations. The plant is situated at Rue du Moulin de l'Ouacre, near the Moulin d'Ouacre. The facility 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. Its designed capacity is 3,000 m³/day, with an average daily discharge of 374.81 m³/day. As a French plant, it operates under national regulations transposing the EU directive, with permits issued by the local water agency. The treated effluent is discharged into local watercourses that eventually drain into the Seine River basin, which flows through Paris and into the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor in northern France. The advanced treatment helps protect downstream water quality in this densely populated region.

The plant discharges into the Seine River basin, which flows through Paris and ultimately reaches the English Channel. The Seine supports a variety of fish species and is a crucial migratory route for eels and salmon. The advanced treatment reduces nutrient loads, helping to prevent eutrophication in the downstream estuary and coastal waters.