SIA Vilanu namsaimnieks Wastewater Treatment Plant, Viļānu pagasts, Latvia

SIA Vilanu namsaimnieks is a municipal wastewater treatment facility located in Viļānu pagasts, Rēzeknes novads, Latvia. The plant serves a population of 1,161, classifying it as a small agglomeration under EU regulations. It is situated inland, away from coastal areas, and its operations are part of Latvia's national wastewater management infrastructure. The plant provides secondary treatment, which is the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. The designed capacity is 1,860 cubic meters per day, with an average discharge volume of 182.41 cubic meters per day, indicating ample reserve capacity for future growth or seasonal variations. The treated effluent is discharged into local watercourses that ultimately drain into the Daugava River basin, which flows into the Baltic Sea. The plant plays a key role in protecting the region's surface water quality and supporting the ecological health of downstream aquatic habitats.

The plant discharges into local streams that are part of the Daugava River basin, which flows through Latvia and into the Baltic Sea. The Baltic Sea is a brackish, semi-enclosed sea with limited water exchange, making it sensitive to nutrient pollution. Secondary treatment reduces organic load and suspended solids, helping to mitigate eutrophication risks in downstream waters.