Gunzenhausen Wastewater Treatment Plant: Serving Bavaria, Germany under EU Directive

The Gunzenhausen wastewater treatment plant is located in the town of Gunzenhausen, in the Bavarian district of Weißenburg-Gunzenhausen, Germany. Serving a population of around 30,400, the plant is classified as a medium agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC). This directive requires secondary treatment for all discharges from agglomerations of this scale, ensuring a high standard of effluent quality before release into the environment. As a German facility, the plant is subject to the national Wasserhaushaltsgesetz (Water Resources Act) and the Abwasserverordnung (Wastewater Ordinance), which implement the EU directive. These regulations set strict limits on pollutants such as biochemical oxygen demand, chemical oxygen demand, and suspended solids. The treated effluent from the Gunzenhausen plant is discharged into the local water system, which ultimately drains into the Danube River basin. The Danube flows southeast through several countries before reaching the Black Sea. This makes the plant's performance important for the ecological health of both local streams and the broader Danube watershed, which supports diverse aquatic life and is a vital water resource for the region.

The Gunzenhausen plant discharges into the Altmühl River, a tributary of the Danube. The Altmühl flows through the Altmühltal Nature Park, an ecologically sensitive area known for its diverse flora and fauna. The Danube then carries the water through multiple countries to the Black Sea. The plant's treatment standards help protect the Altmühl's water quality, which supports fish populations and migratory birds in this important natural corridor.