Valley Wastewater Treatment Plant, Unterdarching, Bayern, Germany

Valley wastewater treatment plant is located in Unterdarching, a district of the municipality of Valley in the Landkreis Miesbach, Bayern, Germany. The plant serves a population of 2,163 and operates with advanced treatment technology, ensuring high-quality effluent. The plant has a designed capacity of 5,000 m³/day and currently treats an average daily flow of 398.18 m³/day, indicating significant spare capacity. As a German facility, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for sensitive areas. The plant's advanced treatment level meets the highest standards for nutrient removal. The treated effluent is discharged into local water bodies that eventually drain into the Mangfall River, a tributary of the Inn River, which flows into the Danube and ultimately the Black Sea. The plant plays a key role in protecting the local watershed and downstream ecosystems from nutrient pollution.

The plant discharges into the Mangfall River catchment, which flows into the Inn River, a major tributary of the Danube. The Danube drains into the Black Sea, making this plant part of a transboundary basin. The region is ecologically sensitive, supporting diverse aquatic life and serving as a migratory corridor for fish species. Advanced treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in downstream waters.