Tussenhausen Wastewater Treatment Plant, Mattsies, Bavaria

The Tussenhausen wastewater treatment plant is located in the Mattsies district of Tussenhausen, in the Unterallgäu district of Bavaria, Germany. It serves a population of 2,620, classifying it as a small agglomeration under German 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. With a designed capacity of 4,500 m³/day and an average daily discharge of 571.03 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that eventually drain into the Danube River basin. The plant plays a key role in protecting the region's groundwater and surface water quality, supporting the ecological health of the surrounding agricultural and natural landscapes.

The plant discharges into small streams that feed into the Wertach River, a tributary of the Lech, which flows into the Danube. The Danube ultimately reaches the Black Sea. The region is characterized by sensitive aquatic ecosystems that rely on high water quality to support diverse flora and fauna, including fish species and macroinvertebrates. Advanced treatment helps minimize nutrient loading and protect downstream habitats.