Courcelles-Chaussy Wastewater Treatment Plant, Grand Est, France

The Courcelles-Chaussy wastewater treatment plant is located in the commune of Courcelles-Chaussy in the Moselle department of Grand Est, France. It serves a population of approximately 3,250 residents, classifying it as a small agglomeration under French and EU regulations. 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. The facility has a designed capacity of 4,800 m³/day and currently treats an average daily flow of 579.79 m³/day, indicating significant available capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Nied River, a tributary of the Saar River, and then into the Moselle River and the Rhine. This discharge supports the ecological health of the regional water bodies, which are part of the Rhine basin, a major European river system.

The plant discharges into the Nied River, which flows into the Saar River, then the Moselle River, and finally the Rhine River. The Rhine basin is a highly regulated and ecologically sensitive area, supporting diverse aquatic life and serving as a critical migratory corridor for fish species. Advanced treatment helps protect downstream water quality in this transboundary river system.