SERQUIGNY Wastewater Treatment Plant, Serquigny, Normandie

The SERQUIGNY wastewater treatment plant is located in Serquigny, a commune in the Eure department of Normandie, France. It serves a population of approximately 2,035 residents, placing it in the small agglomeration category under French regulations. The plant is situated inland, away from coastal areas, and treats wastewater from the local community. 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. With a designed capacity of 3,000 m³ per day and an average discharge volume of 363 m³ per day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into the local watershed, which ultimately drains into the Seine River basin. The Seine flows through Normandie and into the English Channel, supporting diverse aquatic life and providing water for agriculture and recreation. The advanced treatment helps protect downstream water quality and the sensitive estuarine environment of the Seine Bay.

The plant discharges into the local water system that feeds into the Risle River, a tributary of the Seine. The Seine River flows through Normandie and empties into the English Channel, forming a large estuary that supports migratory fish species and diverse bird populations. The advanced treatment at SERQUIGNY helps reduce nutrient loading and protects the ecological health of the downstream river and coastal waters.