Dobre Wastewater Treatment Plant, Wielgolas Duchnowski, Poland

The Dobre wastewater treatment plant is located in Wielgolas Duchnowski, within the miński district of the Mazowieckie voivodeship in Poland. It serves a small community of 1,227 residents, reflecting its role as a local municipal facility in a rural-urban fringe area near Warsaw. The plant provides secondary treatment, which is the standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent below 10,000. With a designed capacity of 1,591 m³/day and an actual discharge volume of 174.95 m³/day, the plant operates well below its capacity, indicating room for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the Vistula River basin, which flows northward into the Baltic Sea. The plant's operation helps protect the local aquatic environment and downstream ecosystems from nutrient pollution and organic load.

The plant discharges into the Mienia River, a tributary of the Świder River, which flows into the Vistula River. The Vistula is the longest river in Poland and drains into the Baltic Sea via the Gdańsk Bay. The local watershed supports diverse aquatic life and is part of a region with mixed agricultural and urban land use, making nutrient management important for preventing eutrophication in downstream waters.