Plonica Wastewater Treatment Plant, Płonica, Lower Silesia, Poland

Plonica wastewater treatment plant is located in the village of Płonica, within the gmina of Złoty Stok in the Lower Silesian Voivodeship of southwestern Poland. The facility serves a small population of 721 residents, providing essential wastewater treatment for this rural community. As a secondary treatment plant, it meets the standard requirements for smaller agglomerations under Polish and EU regulations. The plant has a designed capacity of 6,250 cubic meters per day, with a current discharge volume of 102.80 cubic meters, indicating low utilization relative to capacity. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), plants serving populations under 2,000 are typically subject to less stringent requirements, but secondary treatment is still expected to protect receiving waters. The plant's operation is part of Poland's national wastewater infrastructure, which aligns with EU directives for water quality. The treated effluent from Plonica is discharged into local streams that eventually drain into the Oder River basin, which flows northward to the Baltic Sea. The plant plays a role in protecting the local watershed from nutrient pollution, supporting aquatic life and downstream water quality in this region of the Sudetes foothills.

The plant discharges into small watercourses within the Oder River basin, which ultimately drains into the Baltic Sea. The local watershed supports diverse aquatic habitats in the Sudetes region, and the plant's secondary treatment helps reduce organic load and nutrient inputs, protecting downstream ecosystems from eutrophication. The area is ecologically sensitive due to its proximity to forested hills and agricultural lands.