Sulzemoos OT Wiedenzhausen Wastewater Treatment Plant, Bavaria

Sulzemoos OT Wiedenzhausen is a municipal wastewater treatment plant located in the village of Wiedenzhausen, part of Sulzemoos in the district of Dachau, Bavaria, Germany. The plant serves a population of approximately 2,060 and is classified as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant provides secondary treatment, which is the minimum standard required by the EU UWWTD for freshwater discharges from agglomerations of this size. With a designed capacity of 2,030 m³/day and an average discharge volume of 609.46 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local receiving waters that ultimately drain into the Danube River basin via the Amper and Isar rivers. This region supports diverse aquatic life and is part of a larger network of rivers flowing into the Black Sea. The plant plays a key role in protecting local water quality and downstream ecosystems.

The plant discharges into small streams that feed into the Amper River, a tributary of the Isar, which joins the Danube near Deggendorf. The Danube then flows into the Black Sea. The watershed supports sensitive aquatic habitats, including spawning grounds for fish and diverse macroinvertebrate communities. Secondary treatment helps reduce organic pollution and nutrient loads, safeguarding these ecosystems.