Dolna Grupa Wastewater Treatment Plant, Michale, Poland

Dolna Grupa is a secondary-level wastewater treatment plant located in Michale, within the kujawsko-pomorskie province of Poland. The facility serves a population of 2,160 and is part of the municipal infrastructure for the local community. The plant operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. With a designed capacity of 10,000 m³/day and an actual discharge volume of 307.98 m³/day, the plant operates well below its capacity, indicating potential for future growth. The treated effluent is discharged into a local watercourse that eventually drains into the Vistula River basin, which flows into the Baltic Sea. The plant plays a key role in protecting downstream water quality and supporting the ecological health of the region's waterways.

The plant's discharge contributes to the Vistula River basin, which is the largest river system in Poland and drains into the Baltic Sea. The downstream environment includes sensitive aquatic habitats that support diverse fish populations and migratory bird species. Effective wastewater treatment is crucial to prevent nutrient loading and maintain water quality in this ecologically important watershed.