CRECY SUR SERRE Wastewater Treatment Plant, Crécy-sur-Serre, Hauts-de-France

The CRECY SUR SERRE wastewater treatment plant is located in Crécy-sur-Serre, a commune in the Aisne department of Hauts-de-France, France. The plant serves a population of approximately 1,980 residents and operates with advanced treatment processes, ensuring high-quality effluent before discharge. As an advanced treatment facility, the plant goes beyond secondary treatment to remove nutrients and other pollutants, meeting stringent French and EU standards. The plant's designed capacity is 2,200 m³/day, with an average daily flow of 353.23 m³/day, indicating ample capacity for current and future needs. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations of this size are required to provide secondary treatment, but this facility exceeds that requirement with advanced treatment. The treated effluent is discharged into the local watershed, which ultimately drains into the Serre River, a tributary of the Oise River, and then into the Seine River before reaching the English Channel. The plant plays a key role in protecting the water quality of the Serre River and downstream ecosystems, including the Seine estuary.

The plant discharges into the Serre River, which flows into the Oise River, a major tributary of the Seine River. The Seine River drains into the English Channel, supporting diverse aquatic life and important fisheries. The advanced treatment at this plant helps reduce nutrient loading, protecting the Serre and downstream waters from eutrophication and maintaining ecological balance in the Seine basin.