Mehrbachtal GKA Wastewater Treatment Plant, Maulsbach, Rheinland-Pfalz

Mehrbachtal GKA is a municipal wastewater treatment plant located in Maulsbach, within the Altenkirchen district of Rheinland-Pfalz, Germany. The plant serves a population of approximately 2,381 residents and is part of the region's wastewater infrastructure. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 2,500 m³/day and an average discharge volume of 479.91 m³/day, the plant operates well within its capacity. As a German facility, it complies with the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for sensitive areas. The treated effluent is discharged into local watercourses that eventually drain into the Rhine River basin. The plant plays a key role in protecting the region's water quality and supporting the ecological health of downstream aquatic environments.

The plant discharges into small streams in the Westerwald region, which flow into the Sieg River, a tributary of the Rhine. The Rhine basin is ecologically significant, supporting diverse aquatic life and serving as a major migratory corridor for fish. Advanced treatment helps reduce nutrient loads, protecting downstream water bodies from eutrophication.