Oberaula _ Wahlshausen Wastewater Treatment Plant, Hessen, Germany

The Oberaula _ Wahlshausen wastewater treatment plant is located in the village of Wahlshausen, part of the Oberaula municipality in the Schwalm-Eder-Kreis district of Hessen, Germany. The plant serves a population of around 4,600 residents, classifying it as a small to medium agglomeration under EU regulations. As a German wastewater facility, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. German facilities typically employ biological treatment stages to meet national effluent standards. The treated wastewater is discharged into local watercourses that drain into the Schwalm River, a tributary of the Eder River, which eventually flows into the Fulda River and then the Weser River system. The plant plays a key role in protecting the local aquatic environment and downstream water quality in the Weser basin.

The plant discharges into small streams that feed the Schwalm River, which flows into the Eder River, a major tributary of the Fulda River. The Fulda joins the Werra to form the Weser River, which drains into the North Sea. The local watershed supports diverse aquatic life and is part of a region with agricultural and natural landscapes. The plant's treatment helps maintain water quality in this connected river system.