Stadtwerke Lohr a Main Wastewater Treatment Plant, Lohr am Main, Bavaria

Stadtwerke Lohr a Main is a municipal wastewater treatment plant located in Lohr am Main, a town in the Main-Spessart district of Bavaria, Germany. The plant serves a population of about 33,900, placing it in the medium agglomeration category under EU classification. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving between 10,000 and 100,000 population equivalents are required to provide secondary treatment, with tertiary treatment mandated if the receiving waters are designated as sensitive areas. It is expected to comply with German water quality standards. The plant discharges treated wastewater into the Main River, a major tributary of the Rhine. The Rhine basin is one of Europe's most important waterways, supporting diverse aquatic life and providing drinking water for millions. The plant's operations contribute to protecting the water quality of the Main and downstream ecosystems.

The plant discharges into the Main River, which flows into the Rhine and ultimately the North Sea. The Main-Rhine corridor is a critical habitat for fish species such as salmon and eel, and supports migratory bird populations. The region's water quality is managed under the EU Water Framework Directive, aiming for good ecological status.