Untergriesbach Wastewater Treatment Plant, Eck, Bavaria

Untergriesbach wastewater treatment plant is located in Eck, a locality within the municipality of Untergriesbach in the Passau district of Bavaria, Germany. The plant serves a population of 4,216 and operates under the regulatory framework of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The plant provides secondary treatment, meeting the standard required for inland discharges under the EU directive. With a designed capacity of 4,000 m³/day and an actual discharge volume of 753.20 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into a local watercourse that eventually drains into the Danube River basin. The Danube is a major European river that flows into the Black Sea, supporting diverse aquatic ecosystems and providing water for agriculture and industry along its course.

The plant discharges into a tributary of the Danube River, which flows through eastern Europe before reaching the Black Sea. The Danube basin is ecologically significant, supporting diverse fish species and migratory birds. The plant's secondary treatment helps protect downstream water quality in this important international watershed.