Lasin Wastewater Treatment Plant, Jakubkowo, Poland

The Lasin wastewater treatment plant is located in Jakubkowo, within the gmina of Łasin in the kujawsko-pomorskie province of Poland. It serves a population of 1,752, classifying it as a small agglomeration under Polish and EU regulations. The plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for settlements of this size discharging into freshwater. The facility provides secondary treatment, meeting the standard required by the directive for inland areas. With a designed capacity of 1,191.00 m³/day and an actual discharge volume of 249.81 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. 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 region's surface waters from nutrient pollution, supporting aquatic ecosystems and downstream water quality in the Baltic Sea catchment area.

The plant discharges into the Vistula River basin, which flows northward through Poland and empties into the Baltic Sea via the Vistula Lagoon. This watershed supports diverse aquatic life and is an important migratory corridor for fish. The Baltic Sea is sensitive to nutrient enrichment, making effective wastewater treatment crucial for reducing eutrophication risks in the region.