Parkstein Wastewater Treatment Plant, Hammerles, Bavaria, Germany

The Parkstein wastewater treatment plant is located in Hammerles, a district of Parkstein in the Bavarian region of Germany. It serves a population of approximately 3,887 people, classifying it as a small agglomeration under the EU Urban Waste Water Treatment Directive (UWWTD). The plant is situated inland, far from coastal waters, and operates within the regulatory framework of the German Water Resources Act (Wasserhaushaltsgesetz). The plant employs advanced treatment processes, which go beyond the secondary treatment standard required by the EU UWWTD for agglomerations of this size. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) to protect sensitive receiving waters. The plant has a designed capacity of 3,000 m³/day and currently discharges 605.68 m³/day of treated wastewater, indicating ample reserve capacity for future growth. The treated effluent is discharged into local watercourses that eventually drain into the Waldnaab River, a tributary of the Naab River, which flows into the Danube River system. The Danube ultimately reaches the Black Sea. The plant's advanced treatment helps protect the ecological health of these downstream waters, supporting aquatic life and water quality in the region.

The plant discharges into local streams that feed the Waldnaab River, part of the Danube basin. The Danube flows through multiple countries before reaching the Black Sea, making nutrient control critical to prevent eutrophication in the Black Sea's northwestern shelf. The region's aquatic ecosystems support diverse fish and invertebrate communities, and advanced treatment helps maintain water quality standards.