Étrépagny Wastewater Treatment Plant, Normandie, France

The Étrépagny wastewater treatment plant is located in the commune of Étrépagny in the Eure department of Normandie, France. It serves a population of approximately 5,090, classifying it as a small to medium agglomeration under French and EU regulations. The plant is situated inland, away from coastal areas, and its operations are part of the regional water management infrastructure. The facility employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 5,000 m³/day and an actual discharge volume of about 908 m³/day, the plant operates well within its capacity, ensuring effective treatment of incoming wastewater. The advanced treatment level indicates that the plant likely includes nutrient removal or other tertiary processes to protect sensitive receiving environments. The treated effluent is discharged into local water bodies that eventually drain into the Seine River basin and ultimately the English Channel. The plant plays a key role in maintaining water quality in the region, supporting both ecological health and downstream uses such as agriculture and recreation. Its inland location reduces direct marine impact, but its discharge contributes to the overall health of the Seine estuary ecosystem.

The plant discharges into local streams that are part of the Seine River basin, which flows through Normandy into the English Channel. The Seine estuary is an ecologically sensitive area supporting diverse aquatic life, including migratory fish species. The advanced treatment helps reduce nutrient loading, which is critical for preventing eutrophication in downstream coastal waters.