Radviliskio aglomeracija Wastewater Treatment Plant, Birjočiai, Lithuania

Radviliskio aglomeracija is a wastewater treatment plant located in Birjočiai, a settlement in the Radviliškis district of Šiaulių apskritis, Lithuania. The plant serves a population of approximately 8,800 people, classifying it as a medium-sized agglomeration under EU regulations. As a plant in Lithuania, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the receiving waters are sensitive to eutrophication or nitrate pollution. The plant discharges treated wastewater into local watercourses that eventually drain into the Nemunas River basin and the Baltic Sea. Proper treatment helps protect downstream ecosystems and supports water quality in the region's rivers and coastal areas.

The treated effluent from Radviliskio aglomeracija flows into local streams that are part of the Nemunas River basin, which ultimately drains into the Curonian Lagoon and the Baltic Sea. This watershed supports diverse aquatic life and is ecologically sensitive to nutrient pollution, making effective wastewater treatment crucial for maintaining water quality and preventing eutrophication in downstream environments.