Brilon Petersborn Gudenhagen Wastewater Treatment Plant, Brilon, Germany

Brilon Petersborn Gudenhagen is a wastewater treatment plant located in Brilon, within the Hochsauerlandkreis district of Nordrhein-Westfalen, Germany. The plant served a small agglomeration of 1,654 people and had a designed capacity of 4,500 cubic meters per day. It is currently closed. As an advanced treatment facility, it likely employed processes beyond secondary treatment, such as nutrient removal or disinfection, to meet German and EU standards. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving agglomerations of this size are required to provide appropriate treatment, with advanced treatment mandated in sensitive areas. The plant's discharge volume was 418.59 m³/day. The region drains into the Rhine basin via the Möhne and Ruhr rivers.

The plant is located in the Sauerland region, a low mountain range with numerous small rivers. The nearest major river is the Möhne, a tributary of the Ruhr, which flows into the Rhine and ultimately the North Sea. The area supports diverse aquatic life, including salmonid fish, and is part of a sensitive watershed that benefits from advanced treatment to reduce nutrient loads and protect downstream ecosystems.