Oklesna Wastewater Treatment Plant, Okleśna, Poland

The Oklesna wastewater treatment plant is located in Okleśna, a village in the Małopolskie Voivodeship of southern Poland. It serves a small population of 675 residents, reflecting its role in a rural community. The plant is situated inland, away from coastal areas, and operates under Polish regulations that transpose the EU Urban Waste Water Treatment Directive. The plant provides primary treatment, which involves physical processes to remove settleable solids. With a designed capacity of 167.00 m³/day and an actual discharge volume of 96.24 m³/day, the facility operates below its capacity. Under the EU Urban Waste Water Treatment Directive, agglomerations with a population equivalent (PE) of less than 2,000 are subject to appropriate treatment requirements, and primary treatment may be considered adequate depending on the receiving water body's sensitivity. The treated effluent is discharged into local watercourses that eventually drain into the Vistula River basin, which flows northward to the Baltic Sea. The plant's operation helps protect the local aquatic environment from untreated sewage, supporting water quality in the region's rivers and streams.

The Oklesna plant discharges into the Vistula River basin, which flows through southern and central Poland before emptying into the Baltic Sea. The local watershed includes small streams and rivers that support diverse aquatic life. The plant's primary treatment reduces suspended solids and organic load, helping to maintain water quality in this ecologically sensitive region.