Gars_Inn Wastewater Treatment Plant, Gars-Bahnhof, Bavaria, Germany

Gars_Inn is an advanced wastewater treatment plant located in Gars-Bahnhof, a locality in the municipality of Gars am Inn, Bavaria, Germany. The plant serves a population of 4,627 and has a designed capacity of 5,600 cubic meters per day, with a current discharge volume of 621.27 cubic meters per day. It is situated inland, away from coastal areas, and treats wastewater from the local community. As an advanced treatment facility, Gars_Inn goes beyond secondary treatment to remove nutrients such as nitrogen and phosphorus, which is typical for plants in sensitive catchment areas under the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size (under 10,000 population equivalent), the directive requires appropriate treatment, and Germany's national regulations often mandate advanced treatment to protect water quality in rivers like the Inn. The plant discharges treated effluent into the Inn River, a major tributary of the Danube. The Inn flows through the Alps and the Bavarian region before joining the Danube at Passau. The Danube then drains into the Black Sea, making this plant part of a vast international river basin. The advanced treatment helps protect downstream ecosystems, including fish spawning grounds and migratory corridors in the Danube delta.

Gars_Inn discharges into the Inn River, which flows into the Danube and ultimately reaches the Black Sea. The Inn River supports diverse aquatic life, including fish species such as grayling and trout, and its water quality is critical for downstream habitats. The advanced treatment at this plant reduces nutrient loads, helping to prevent eutrophication in the Danube and Black Sea. The surrounding region is characterized by agricultural land and small settlements, making the plant's role in maintaining local water quality important for both ecology and human use.