Swiecie nad Osa Wastewater Treatment Plant, Świecie nad Osą, Poland

The Swiecie nad Osa wastewater treatment plant is located in Świecie nad Osą, a town in the kujawsko-pomorskie province of Poland. It serves a population of 1,733, classifying it as a small agglomeration under Polish and EU regulations. The plant is situated inland, away from coastal areas. The facility provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant has a designed capacity of 3,520 m³/day and currently discharges 247.10 m³/day of treated wastewater, indicating ample reserve capacity. The treated effluent is discharged into local watercourses that eventually drain into the Vistula River basin, which flows into the Baltic Sea. The plant plays a key role in protecting the local aquatic environment from untreated sewage, supporting water quality in the region's rivers and downstream ecosystems.

The plant discharges into the Osa River, a tributary of the Vistula River, which ultimately flows into the Baltic Sea. The Vistula basin supports diverse aquatic life and is an important migratory corridor for fish species. The secondary treatment provided helps reduce nutrient loads, mitigating eutrophication risks in the Baltic Sea, a sensitive marine environment.