Sawin Wastewater Treatment Plant, Kozia Góra, Poland

The Sawin wastewater treatment plant is located in Kozia Góra, a village in the Lublin Voivodeship of eastern Poland. It serves a small population of 895 residents, reflecting its role in a rural community. The plant is part of Poland's municipal wastewater infrastructure, which is regulated under the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant provides secondary treatment, which is the minimum standard required under the EU directive for agglomerations of this size. It has a designed capacity of 2,100 m³/day and currently discharges an average of 127.61 m³/day, indicating significant spare capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local water body, which eventually drains into the Bug River basin and then to the Vistula River, ultimately reaching the Baltic Sea. The plant plays a key role in protecting local water quality and the downstream aquatic environment from untreated sewage.

The plant discharges into a local watercourse that is part of the Bug River basin, a tributary of the Vistula River. The Vistula flows into the Baltic Sea, a semi-enclosed sea sensitive to nutrient pollution. The surrounding area is predominantly agricultural, so the plant helps reduce nutrient loads that could contribute to eutrophication in downstream waters. The local watershed supports diverse aquatic life and is an important ecological corridor.