Haguenau Wastewater Treatment Plant - Serving 64,000 in Grand Est, France

The Haguenau wastewater treatment plant is located in Haguenau, a commune in the Bas-Rhin department of the Grand Est region in northeastern France. The plant serves a population of approximately 64,000, classifying it as a medium-to-large agglomeration under EU regulations. Its location near the Moder River places it within the Rhine basin, a major European watershed. As a French facility serving over 10,000 population equivalents, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC). This directive requires secondary treatment for all discharges from agglomerations of this size, with more stringent tertiary treatment if the receiving waters are designated as sensitive areas. The regulatory framework ensures compliance with European standards for organic matter and nutrient removal. The plant's treated effluent is discharged into the Moder River, a tributary of the Rhine. The Rhine basin is one of Europe's most important river systems, supporting diverse aquatic life and providing water for millions of people. Downstream, the Rhine flows through Germany and the Netherlands before reaching the North Sea, making the plant's performance critical for transboundary water quality and the ecological health of the Rhine delta.

The Haguenau plant discharges into the Moder River, which flows into the Rhine River near Strasbourg. The Rhine is a major European waterway that ultimately drains into the North Sea, supporting a rich ecosystem including migratory fish species such as salmon and eel. The plant's location in the Upper Rhine valley, a region with significant agricultural and industrial activity, underscores the importance of effective wastewater treatment to prevent nutrient pollution and protect downstream water quality.