Stephansposching Wastewater Treatment Plant, Uttenhofen, Bayern

The Stephansposching wastewater treatment plant is located in Uttenhofen, a district of Stephansposching in the Landkreis Deggendorf, Bayern, Germany. It served a population of 1,505 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is now closed, but during its operation it provided secondary treatment, which is the minimum required by the UWWTD for freshwater discharges from agglomerations of this size. As a secondary treatment facility, the plant employed biological processes to remove organic matter and suspended solids. Its designed capacity was 4,000 m³/day, and the actual discharge volume was 380.88 m³/day, indicating a low utilization rate. The plant operated under the German water management framework, which implements the EU UWWTD through the Wasserhaushaltsgesetz (WHG) and state-level regulations. Permits for such plants are typically issued by the local water authority (Wasserwirtschaftsamt). The treated effluent was discharged into a local water body, likely a tributary of the Danube River, as the region drains into the Danube basin. The Danube flows eastward through Central and Eastern Europe before emptying into the Black Sea. The plant's operation contributed to protecting the local aquatic ecosystem and downstream water quality in the Danube catchment.

The plant discharged into a small watercourse within the Danube River basin, which ultimately flows into the Black Sea. The region is characterized by agricultural land use and small settlements, making the protection of local streams important for maintaining biodiversity and preventing nutrient enrichment. The Danube basin supports diverse aquatic life, including fish species such as sturgeon and migratory birds.