Oberhoppen GKA Wastewater Treatment Plant, Rhineland-Palatinate, Germany

Oberhoppen GKA is a wastewater treatment plant located in Oberhoppen, a locality within the municipality of Neustadt (Wied) in the district of Neuwied, Rhineland-Palatinate, Germany. The plant serves a population of approximately 15,909, classifying it as a medium-sized agglomeration under EU regulations. As a German facility, Oberhoppen GKA is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations with a population equivalent (PE) between 2,000 and 15,000, and more stringent treatment if discharging into sensitive areas. For this population tier, secondary biological treatment is the standard expectation, ensuring effective removal of organic matter and suspended solids. The plant's treated effluent is discharged into local watercourses that eventually drain into the Rhine River basin. The Rhine is a major European waterway supporting diverse aquatic life and providing drinking water for millions. The plant plays a key role in protecting downstream water quality in the Rhine catchment, contributing to the ecological health of the river and its tributaries.

Oberhoppen GKA discharges into local streams that flow into the Wied River, a tributary of the Rhine. The Rhine basin is a densely populated and ecologically significant region, supporting migratory fish species such as salmon and eel. The plant's treatment helps maintain water quality in the Wied and Rhine, reducing nutrient loads that could otherwise contribute to eutrophication in downstream lakes and the North Sea.