SKA Wittigbachtal AZV Wastewater Treatment Plant, Unterwittighausen, Germany

SKA Wittigbachtal AZV is a municipal wastewater treatment plant located in Unterwittighausen, a village in the Main-Tauber-Kreis district of Baden-Württemberg, Germany. The plant serves a population equivalent of around 2,400 residents, classifying it as a small agglomeration under EU regulations. As a German plant serving fewer than 10,000 people, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment based on the sensitivity of the receiving waters. For small agglomerations, secondary treatment is typically mandated unless the discharge is into a less sensitive area. The treated effluent from the plant is discharged into the Wittigbach stream, a tributary of the Tauber River, which flows into the Main River and ultimately the Rhine. The Rhine basin supports diverse aquatic life and is an important ecological corridor in central Europe.

The plant discharges into the Wittigbach, a small stream that flows into the Tauber River, a tributary of the Main River. The Main joins the Rhine near Mainz, and the Rhine ultimately drains into the North Sea. The local watershed is part of the Rhine basin, which supports diverse aquatic ecosystems and is a critical migratory route for fish species. The area is characterized by agricultural land use and small settlements, making nutrient management important to prevent eutrophication in downstream waters.