Kopfing Wastewater Treatment Plant, Kopfingerdorf, Oberösterreich

Kopfing wastewater treatment plant is located in Kopfingerdorf, a locality in the municipality of Diersbach, Bezirk Schärding, Oberösterreich, Austria. The plant serves a population of approximately 1,366 people, reflecting a small agglomeration scale typical of rural communities in the region. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Its designed capacity is 2,500 m³/day, with an actual discharge volume of 324.28 m³/day, indicating ample reserve capacity for future growth or seasonal peaks. The treated effluent is discharged into local watercourses that ultimately drain into the Danube River basin, contributing to the Black Sea watershed. The plant's advanced treatment helps protect downstream aquatic ecosystems, including sensitive areas in the Danube delta, by reducing nutrient loads and organic pollutants.

The plant discharges into small streams in the Innviertel region, which flow into the Inn River and then the Danube River, eventually reaching the Black Sea. The Danube basin supports diverse aquatic life and is an important migratory corridor for fish species. Advanced treatment at this plant helps minimize eutrophication risks in downstream lakes and the Danube delta.