Swieta Katarzyna Wastewater Treatment Plant, Święta Katarzyna, Poland

Swieta Katarzyna wastewater treatment plant is located in the village of Święta Katarzyna, within the gmina Bodzentyn in województwo świętokrzyskie, Poland. The plant serves a small population of 1,452 and operates with secondary treatment, which is the standard level required under Polish regulations for agglomerations of this size. The plant's designed capacity is 848.00 m³/day, and it currently discharges 207.03 m³/day of treated wastewater. As a secondary treatment facility, it meets the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for all inland agglomerations with a population equivalent above 2,000. Although the plant serves fewer than 2,000 people, it still provides secondary treatment, ensuring environmental protection. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward into the Baltic Sea. The plant plays a key role in protecting the local watershed and downstream ecosystems from untreated wastewater pollution.

The plant discharges into the local catchment of the Vistula River basin, which flows through central Poland and empties into the Baltic Sea via the Gulf of Gdańsk. The surrounding region is part of the Świętokrzyskie Mountains, an area with diverse aquatic habitats. The secondary treatment provided by the plant helps reduce nutrient loads and organic pollution, supporting the ecological health of downstream rivers and the sensitive Baltic Sea environment.