ZV Fussen Sitz Fussen Wastewater Treatment Plant, Waltenhofen, Bavaria

ZV Fussen Sitz Fussen is a municipal wastewater treatment plant located in Waltenhofen, near Fussen in the Bavarian district of Ostallgau, Germany. The plant serves a population of approximately 34,000, classifying it as a medium agglomeration under EU regulations. As a German plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for discharges into freshwater bodies. For agglomerations between 10,000 and 150,000 population equivalents, the directive sets standards for biological oxygen demand and suspended solids removal. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Lech River, a tributary of the Danube. The Danube then flows into the Black Sea. The region is ecologically sensitive, supporting diverse aquatic life in the Alpine foothills and contributing to the water quality of downstream ecosystems.

The plant discharges into the Lech River basin, which flows through the Bavarian Alps before joining the Danube River. The Danube carries water across Central and Eastern Europe to the Black Sea. The local watershed supports diverse aquatic habitats, including fish species such as grayling and brown trout, and is part of a region known for its ecological sensitivity due to Alpine runoff and tourism pressures.