Krummennaab Wastewater Treatment Plant, Bavaria | Germany

The Krummennaab wastewater treatment plant is located in the municipality of Krummennaab, in the district of Tirschenreuth, Bavaria, Germany. It serves a population of about 3,900 people, classifying it as a small agglomeration under EU regulations. As a German plant serving fewer than 10,000 people, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment before discharge. The plant discharges treated wastewater into local watercourses that ultimately drain into the Waldnaab River, a tributary of the Naab, which flows into the Danube River and eventually reaches the Black Sea. This connection to the Danube basin highlights the plant's role in protecting downstream aquatic ecosystems.

The plant's treated effluent enters local streams that feed into the Waldnaab River, part of the Danube River basin. The Danube flows through multiple countries before reaching the Black Sea, making water quality management critical for transboundary ecological health. The region supports diverse aquatic life, including fish species dependent on clean water, and the plant helps prevent nutrient pollution that could cause eutrophication in downstream waters.