Nowa Slupia Wastewater Treatment Plant, Stara Słupia, Poland

Nowa Slupia is a municipal wastewater treatment plant located in Stara Słupia, within the gmina of Nowa Słupia in the świętokrzyskie province of Poland. The facility serves a population of approximately 1,906 people, placing it in the small agglomeration category under Polish and EU regulations. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland freshwater discharges from agglomerations of this size. The plant's designed capacity is 2,117 m³/day, and current discharge volume is 271.77 m³/day, indicating ample reserve capacity. The treated effluent is discharged into a local watercourse that ultimately drains into the Vistula River basin, which flows northward to the Baltic Sea. The plant plays a key role in protecting local streams and groundwater from untreated sewage, supporting the ecological health of the region's aquatic ecosystems.

The plant discharges into a small watercourse within the Vistula River basin. The Vistula is Poland's largest river, flowing into the Baltic Sea via the Gdańsk Bay. The downstream environment includes diverse aquatic habitats that support fish, macroinvertebrates, and migratory bird species. Secondary treatment reduces organic load and suspended solids, helping to prevent eutrophication in the Baltic Sea, which is sensitive to nutrient pollution.