ARA GAV Ruprechtshofen St Leonhard Wastewater Treatment Plant, Sankt Leonhard am Forst

ARA GAV Ruprechtshofen St Leonhard is a wastewater treatment plant located in Sankt Leonhard am Forst, in the state of Niederösterreich, Austria. The plant serves a population of about 3,288 people, classifying it as a small agglomeration under Austrian and EU regulations. As a plant in Austria, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive aims to protect the environment from the adverse effects of untreated wastewater. The plant discharges treated effluent into local watercourses that eventually drain into the Danube River basin. The Danube is a major European river that flows into the Black Sea, supporting diverse aquatic ecosystems and providing water for millions of people.

The plant's treated effluent enters local streams that are part of the Danube River basin. The Danube is one of Europe's most important waterways, supporting a wide range of aquatic life and serving as a migratory corridor for fish species. Downstream, the river flows through several countries before reaching the Danube Delta and the Black Sea, a region of significant ecological importance.