Wolfersdorf Wastewater Treatment Plant, Berghaselbach, Bavaria

Wolfersdorf wastewater treatment plant is located in Berghaselbach, a district of Wolfersdorf in the Bavarian district of Freising, Germany. The plant serves a population of approximately 2,400 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant provides secondary treatment, which is the minimum required by the EU UWWTD for freshwater discharges from agglomerations of this size. With a designed capacity of 3,000 m³/day and an average daily discharge of 448.72 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal fluctuations. The treated effluent is discharged into local watercourses that ultimately drain into the Isar River, a major tributary of the Danube. The Danube flows into the Black Sea, making this plant part of a large transboundary river basin. The plant's operation helps protect the local aquatic ecosystem and downstream water quality.

The plant discharges into small streams that feed into the Isar River, which flows through Munich and joins the Danube near Deggendorf. The Danube then travels through several countries before reaching the Black Sea. The Isar and Danube support diverse aquatic life, including fish species such as grayling and Danube salmon. The plant's secondary treatment reduces organic pollutants and suspended solids, helping to maintain the ecological health of these rivers.