Roznow Wastewater Treatment Plant, Rożnów, Lesser Poland Voivodeship

The Roznow wastewater treatment plant is located in Rożnów, a village in the Lesser Poland Voivodeship (województwo małopolskie), southern Poland. It serves a population of 855, placing it in the small agglomeration category under Polish and EU regulations. The plant employs advanced treatment processes, which go beyond the EU Urban Waste Water Treatment Directive's minimum requirement of secondary treatment for agglomerations under 10,000 population equivalent. Its designed capacity is 3000 m³/day, with an actual discharge volume of 121.91 m³/day, indicating significant spare capacity. The treated effluent is discharged into the local watershed, which ultimately drains into the Dunajec River, a tributary of the Vistula River. The Vistula flows northward through Poland to the Baltic Sea. The plant's advanced treatment helps protect the Dunajec and Vistula rivers from nutrient pollution, supporting aquatic life and downstream ecosystems.

The Roznow plant discharges into the Dunajec River basin, part of the larger Vistula River system that drains into the Baltic Sea. The Dunajec is a submontane river with diverse aquatic habitats, supporting fish species such as brown trout and grayling. Advanced treatment at this facility reduces nutrient loading, helping to prevent eutrophication in the Vistula estuary and Baltic Sea.