LONGNY AU PERCHE Wastewater Treatment Plant, Longny les Villages, Normandy, France

The LONGNY AU PERCHE wastewater treatment plant is located in Longny les Villages, within the Normandy region of France. It serves a population of approximately 1,502 people, classifying it as a small agglomeration under French and EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the local municipal infrastructure. 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 2,050 m³/day and a current discharge volume of 267.95 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. The plant is likely subject to French national regulations that implement the EU directive, ensuring high environmental standards. The treated effluent from the plant is discharged into local water bodies that eventually drain into the Seine River basin and ultimately the English Channel. The advanced treatment level helps protect the downstream aquatic environment, including sensitive ecosystems in the Normandy region. The plant plays a key role in maintaining water quality in the local watershed, supporting both ecological health and human uses of water resources.

The plant discharges into local streams that are part of the Seine River basin, which flows northward to the English Channel. The watershed supports diverse aquatic life and is important for regional biodiversity. Advanced treatment helps minimize nutrient and pollutant loads, protecting downstream water quality in both freshwater and coastal environments.