Stary Dzików Wastewater Treatment Plant, Tryńcza, Poland

Stary Dzików is a wastewater treatment plant located in Tryńcza, within the Podkarpackie Voivodeship of southeastern Poland. The facility serves a small population of 637 residents, reflecting its role in a rural community. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids from municipal wastewater. The plant operates under Poland's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations with a population equivalent (PE) between 2,000 and 10,000 discharging into freshwater. With a population served of 637, this plant falls below the threshold for mandatory secondary treatment under the directive, but it nonetheless provides secondary treatment. The designed capacity of 4905 m³/day indicates the plant is sized for potential future growth or seasonal variations. The treated effluent is discharged into a local watercourse, likely a tributary of the San River, which flows into the Vistula River and eventually reaches the Baltic Sea. The plant's operation helps protect the local aquatic environment from nutrient pollution and organic loading, supporting the ecological health of the downstream river system.

The plant discharges into a small watercourse that is part of the San River basin, a tributary of the Vistula River. The Vistula flows northward through Poland to the Baltic Sea. The local watershed supports diverse aquatic life and is important for maintaining water quality in the region. The plant's secondary treatment reduces organic pollutants and nutrients, helping to prevent eutrophication in downstream waters.