Hattmatt Wastewater Treatment Plant | Grand Est, France

The Hattmatt wastewater treatment plant is located in the commune of Hattmatt, in the Bas-Rhin department of the Grand Est region, France. It serves a population of approximately 3,200 people, classifying it as a small agglomeration under EU classifications. The plant is situated along the D 116 road, near the Zorn river valley. 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. Its designed capacity is 3,500 m³/day, with an average daily discharge of 571 m³, indicating significant spare capacity. The facility operates under the French regulatory framework, which implements the EU directive through national legislation, and is subject to permits issued by the local water agency (Agence de l'Eau Rhin-Meuse). Treated effluent from the plant is discharged into the local watercourse, which flows into the Zorn river, a tributary of the Moder. The Moder eventually joins the Rhine river, which drains into the North Sea. The plant plays a key role in protecting the sensitive Rhine-Meuse basin, supporting aquatic ecosystems and water quality in this agriculturally intensive region.

The plant discharges into a local stream that feeds the Zorn river, a tributary of the Moder, which flows into the Rhine river. The Rhine is a major European waterway that ultimately drains into the North Sea. The surrounding watershed supports diverse aquatic life and is part of the Rhine-Meuse basin, an ecologically significant area. The advanced treatment helps reduce nutrient loads, protecting downstream water quality in this region characterized by intensive agriculture and sensitive groundwater resources.