Szerzyny Nadole Wastewater Treatment Plant - Szerzyny, Poland

The Szerzyny Nadole wastewater treatment plant is located in the village of Szerzyny, within the gmina of Szerzyny, powiat tarnowski, in the małopolskie province of Poland. This facility serves a population of approximately 2,538 residents, classifying it as a small agglomeration 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 and estuaries from agglomerations of this size. The plant has a designed capacity of 4,489 m³/day and currently treats an average daily flow of 361.88 m³/day, indicating significant reserve capacity. 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 waters from nutrient pollution, supporting aquatic life and downstream water quality in this rural, agricultural area of southern Poland.

The plant discharges into small streams that are part of the Vistula River basin, which drains into the Baltic Sea. The local watershed includes the Ropa River, a tributary of the Dunajec, which flows into the Vistula. This region supports diverse aquatic ecosystems and is important for migratory fish species. The secondary treatment helps reduce organic load and nutrients, mitigating eutrophication risks in downstream waters.