Dornburg _ Thalheim Wastewater Treatment Plant, Thalheim, Hessen, Germany

The Dornburg _ Thalheim wastewater treatment plant is located in the Thalheim district of Dornburg, in the Landkreis Limburg-Weilburg region of Hessen, Germany. The facility serves a population of around 2,929 residents, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). As a German plant serving fewer than 10,000 people, it is subject to national regulations implementing the EU UWWTD, which requires appropriate treatment based on the sensitivity of the receiving waters. For small agglomerations, secondary treatment is typically mandated unless the discharge is into a less sensitive area, where primary treatment may suffice. The treated effluent is discharged into local watercourses that ultimately drain into the Lahn River, a tributary of the Rhine. The Rhine basin is a major European watershed supporting diverse aquatic life and providing drinking water for millions. The plant's operations contribute to protecting the water quality of these downstream ecosystems.

The plant discharges into small streams that feed into the Lahn River, which flows into the Rhine. The Rhine basin is ecologically significant, supporting migratory fish species and diverse aquatic habitats. The region's mixed agricultural and urban land use means nutrient management is important to prevent eutrophication in downstream waters.