Dorsbachtal GKA Wastewater Treatment Plant, Ergeshausen, Rhineland-Palatinate

Dorsbachtal GKA is a municipal wastewater treatment plant located in Ergeshausen, a village in the Rhein-Lahn-Kreis district of Rhineland-Palatinate, Germany. The plant serves a population of approximately 8,655 people, placing it in the small-to-medium agglomeration category under EU classification. As a German plant, Dorsbachtal GKA is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. German regulations typically mandate biological treatment with nutrient removal for sensitive areas. The plant discharges treated wastewater into local watercourses that eventually drain into the Rhine River basin. The Rhine is a major European waterway supporting diverse aquatic ecosystems and providing drinking water for millions. The plant's operations contribute to protecting the water quality of the Rhine catchment.

The treated effluent from Dorsbachtal GKA flows into small streams in the Aar-Einrich region, which are tributaries of the Lahn River. The Lahn joins the Rhine near Koblenz, a major European river that drains into the North Sea. The Rhine basin supports a rich diversity of fish, invertebrates, and migratory birds, and is an important corridor for aquatic life. The plant's discharge must meet strict German and EU standards to prevent eutrophication and protect downstream habitats.