ARA GAV Raum Hohe Wand Steinfeld 1 WB Wastewater Treatment Plant, Bad Fischau-Brunn, Austria

ARA GAV Raum Hohe Wand Steinfeld 1 WB is a municipal wastewater treatment plant located in Bad Fischau-Brunn, in the state of Niederösterreich, Austria. The plant serves a population of approximately 12,067, placing it in the medium agglomeration category under Austrian and EU regulations. As a plant of this scale 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 also mandates more advanced treatment if the receiving waters are designated as sensitive areas. It is expected to meet the regulatory standards for its population tier. The plant discharges treated effluent into the local watershed, which ultimately drains into the Danube River basin. The Danube is a major European waterway that flows into the Black Sea, supporting diverse aquatic ecosystems and providing water for millions of people. The plant plays a key role in protecting the water quality of this important river system.

The plant's treated effluent enters the local tributaries of the Danube River, which flows through eastern Austria and eventually into the Black Sea. The Danube basin is ecologically significant, supporting diverse fish populations, migratory birds, and riparian habitats. The plant helps maintain water quality in this sensitive watershed, reducing nutrient loads and preventing eutrophication downstream.