UWWTP Pirdop - Advanced Wastewater Treatment Plant in Pirdop, Bulgaria

UWWTP Pirdop is an advanced wastewater treatment facility located in Pirdop, Sofia Province, Bulgaria. The plant serves a population of approximately 15,571 and has a designed capacity of 19,650 m³ per day, with an average discharge volume of 822.15 m³/day. As an advanced treatment plant, UWWTP Pirdop goes beyond secondary treatment to remove nutrients and other pollutants, meeting stringent standards under Bulgarian and EU regulations. Bulgaria, as an EU member state, implements the Urban Waste Water Treatment Directive (91/271/EEC), which requires advanced treatment for sensitive areas and agglomerations over 10,000 population equivalent. The plant discharges treated effluent into local watercourses that eventually drain into the Maritsa River basin, which flows through the Balkan region and into the Aegean Sea. The advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the region.

UWWTP Pirdop discharges into local streams that are part of the Maritsa River basin. The Maritsa River flows through Bulgaria and Turkey before reaching the Aegean Sea. The region's watershed supports diverse aquatic life and is important for agriculture and biodiversity. Advanced treatment at the plant helps reduce nutrient loading, protecting downstream water bodies from eutrophication.