OSK W Ogrodzieńcu Wastewater Treatment Plant, Ogrodzieniec, Silesia

OSK W Ogrodzieńcu is a municipal wastewater treatment plant located in Ogrodzieniec, a town in the Silesian Voivodeship of southern Poland. The facility serves a population of approximately 2,330 residents, 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 discharges into freshwater bodies from agglomerations of this size. With a designed capacity of 8,333 m³/day and an actual discharge volume of 332.22 m³/day, the plant operates well below its capacity, indicating potential for future growth or seasonal variability. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward to the Baltic Sea. The plant plays a key role in protecting the region's surface water quality, particularly in the context of the EU Water Framework Directive's goals for good ecological status.

The plant discharges into the Vistula River basin, which drains into the Baltic Sea. The local watershed includes small streams and rivers that support diverse aquatic life and are part of the region's ecological network. Protecting these water bodies from nutrient pollution is critical, as the Baltic Sea is sensitive to eutrophication from nitrogen and phosphorus loads.