GRENTZINGEN Wastewater Treatment Plant, Illtal, Grand Est, France

GRENTZINGEN is a wastewater treatment plant located in Illtal, in the Grand Est region of France. It serves a population of approximately 1,400 people and is situated in the Haut-Rhin department near the Swiss border. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive for agglomerations of this size. With a designed capacity of 9,800 m³/day and a current discharge volume of 249.76 m³/day, the facility operates well below its capacity, indicating room for future growth. The treated effluent is discharged into local waterways that ultimately drain into the Rhine River basin. The plant plays a key role in protecting the region's water quality, supporting both local ecosystems and downstream communities that rely on the Rhine for drinking water and recreation.

The plant discharges into the local watershed, which is part of the Rhine River basin. The Rhine flows through Germany and the Netherlands before reaching the North Sea. This region supports diverse aquatic life, including migratory fish species, and the plant's advanced treatment helps maintain water quality in this ecologically sensitive transboundary river system.