Koflach Gradnerbachtal Wastewater Treatment Plant, Rosental an der Kainach, Austria

The Koflach Gradnerbachtal wastewater treatment plant is located in Rosental an der Kainach, a municipality in the Bezirk Voitsberg district of Steiermark, Austria. The plant serves a population of approximately 21,718 people, placing it in the medium agglomeration category under Austrian and EU regulations. As an Austrian plant, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The plant is situated inland, away from coastal areas, and its treated effluent is discharged into local watercourses that eventually drain into the Mur River system. The receiving water body is the Gradnerbach stream, a tributary of the Kainach River, which flows into the Mur River and ultimately reaches the Danube River basin. The plant plays a key role in protecting the local aquatic environment and downstream ecosystems in the Mur-Danube watershed.

The plant discharges into the Gradnerbach, a small stream that joins the Kainach River. The Kainach flows into the Mur River, a major tributary of the Danube. The Mur-Danube system supports diverse aquatic life and is an important ecological corridor in Central Europe. The plant's treatment helps maintain water quality in this sensitive watershed.