Oberach Wastewater Treatment Plant, Pattigham, Oberösterreich

The Oberach wastewater treatment plant is located in Pattigham, a municipality in the Bezirk Ried district of Oberösterreich, Austria. It serves a population of approximately 2,350 people, placing it in the small agglomeration category under Austrian and EU regulations. The plant employs advanced treatment processes, which go beyond the EU Urban Waste Water Treatment Directive's minimum secondary treatment requirement for inland plants. With a designed capacity of 3,000 m³/day and a reported discharge volume of 999.58 m³/day, the facility operates well within its capacity, indicating efficient treatment. The treated effluent is discharged into local waterways that ultimately drain into the Danube River basin, contributing to the protection of the Black Sea ecosystem. Advanced treatment helps reduce nutrient loads, supporting water quality in downstream rivers and lakes.

The plant discharges into small streams in the Innviertel region, which flow into the Inn River and then the Danube. The Danube is a major European waterway that drains into the Black Sea. Advanced treatment at this plant helps reduce nutrient pollution, protecting aquatic life in the Danube basin and the ecologically sensitive Black Sea coastal zone.