Oberndorf a Lech Wastewater Treatment Plant, Bavaria, Germany

The Oberndorf a Lech wastewater treatment plant is located in the municipality of Oberndorf am Lech, within the Donau-Ries district of Bavaria, Germany. This facility serves a population of approximately 2,500 residents, making it a small-scale municipal treatment plant typical of rural communities in southern Germany. The plant provides secondary treatment, which is the standard biological treatment stage required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent between 2,000 and 10,000. The designed capacity of 3,167 m³/day indicates the plant is sized to handle current and modest future loads. The actual discharge volume of 775.36 m³/day suggests the plant operates well below its capacity. Treated effluent from the plant is discharged into the local water environment, ultimately contributing to the Danube River basin. The plant plays a key role in protecting the water quality of the Lech River and downstream ecosystems, including the Danube, by reducing organic pollutants and nutrients before discharge.

The plant discharges into the Lech River, a tributary of the Danube. The Lech flows through the Bavarian Alps and into the Danube, which drains into the Black Sea. The downstream environment supports diverse aquatic life and is an important corridor for migratory fish. The plant's secondary treatment helps reduce nutrient loads that could otherwise contribute to eutrophication in the Danube and Black Sea.