Poludnie Wastewater Treatment Plant, Wólka Górska, Mazowieckie, Poland

Poludnie is a wastewater treatment plant located in Wólka Górska, a village in the Legionowo County of województwo mazowieckie, Poland. Serving a population equivalent of 35,269, the plant is part of the municipal infrastructure for the Warsaw metropolitan area. The facility is situated near the Vistula River, which is the primary watercourse in the region. As a medium-sized agglomeration under the EU Urban Waste Water Treatment Directive (91/271/EEC), the plant is required to provide secondary treatment as a minimum. For sensitive areas, such as those draining into the Baltic Sea, tertiary treatment may be mandated to reduce nutrient loads. Regulatory compliance ensures appropriate treatment standards. The treated effluent from Poludnie is discharged into the Vistula River basin, which flows northward through Poland and into the Baltic Sea via the Gdańsk Bay. The Vistula is the longest river in Poland and supports diverse aquatic ecosystems, including fish spawning grounds and migratory bird habitats. The plant's operations contribute to protecting the water quality of this major European waterway.

Poludnie discharges into the Vistula River basin, which drains into the Baltic Sea via the Gdańsk Bay. The Vistula is a critical ecological corridor for migratory fish species such as salmon and sturgeon, and its delta supports important wetland habitats. Nutrient loading from wastewater can contribute to eutrophication in the Baltic Sea, making effective treatment essential for regional marine health.