Ohlstadt Wastewater Treatment Plant: Advanced Treatment in Bavaria, Germany

The Ohlstadt wastewater treatment plant is located in the municipality of Ohlstadt, in the district of Garmisch-Partenkirchen, Bavaria, Germany. It serves a population of approximately 4,500 people, making it a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. With a designed capacity of 6,000 m³/day and an average discharge volume of 854.98 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local water bodies that drain into the Loisach River, a tributary of the Isar, which ultimately flows into the Danube River and then the Black Sea. The plant's advanced treatment helps protect the sensitive Alpine foothills ecosystem and downstream water quality.

The plant discharges into the Loisach River catchment, part of the Danube basin that flows into the Black Sea. The region is ecologically sensitive, supporting diverse aquatic life and serving as a corridor for migratory fish. Advanced treatment ensures minimal nutrient and pollutant loading, protecting the downstream Isar River and Danube Delta ecosystems.