Hottviller Wastewater Treatment Plant - Grand Est, France

The Hottviller wastewater treatment plant is located in the commune of Hottviller, in the Moselle department of the Grand Est region, France. It serves a population of approximately 2,300 residents, 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 regional water management infrastructure. The plant 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. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The designed capacity of 7,583 m³/day indicates the plant is sized to handle peak flows, while the actual discharge volume of 410.32 m³/day suggests a utilization rate well below capacity, reflecting the small population served. The treated effluent is discharged into local watercourses that ultimately drain into the Rhine River basin. The Grand Est region is part of the larger Rhine-Meuse hydrological system, which flows through Germany and the Netherlands into the North Sea. The advanced treatment helps protect downstream aquatic ecosystems, including the Rhine, which supports diverse fish species and is an important migratory corridor for salmon and eels.

The plant discharges into local streams that feed into the Rhine River basin, a major European waterway flowing through Germany and the Netherlands to the North Sea. The Rhine supports diverse aquatic life, including salmon and eels, and is an important ecological corridor. Advanced treatment at Hottviller helps reduce nutrient loads, protecting downstream water quality in this sensitive transboundary basin.