Obarzym Wastewater Treatment Plant, Niewistka, Podkarpackie, Poland

Obarzym is a wastewater treatment plant located in Niewistka, within the gmina Dydnia, powiat brzozowski, in the Podkarpackie Voivodeship of southeastern Poland. The plant provides secondary treatment for a population of 1,153, reflecting its role in serving a small rural community. Its designed capacity of 4,400 m³/day indicates infrastructure scaled to accommodate future growth or seasonal variations. As a secondary treatment facility, Obarzym meets the minimum requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for populations between 2,000 and 10,000, and while Obarzym serves fewer than 2,000, the plant's secondary treatment level aligns with best practices for protecting local water quality. The plant's discharge volume of 164.40 m³/day is well below its designed capacity, suggesting efficient operation. The treated effluent from Obarzym is discharged into a local watercourse that ultimately drains into the San River basin, a tributary of the Vistula River, which flows into the Baltic Sea. The plant's inland location, more than 50 km from the coast, reduces direct marine impact, but its discharge contributes to the overall nutrient load in the Vistula catchment, which is subject to Baltic Sea eutrophication concerns.

Obarzym discharges into a small stream within the San River basin, which flows into the Vistula River and eventually reaches the Baltic Sea. The region is characterized by rural landscapes and forested areas, with the plant's effluent contributing to local water quality. The plant's location in the Carpathian foothills means the receiving waters support diverse aquatic life, including fish species such as brown trout.