Wapnica Wastewater Treatment Plant - Coastal Poland, Secondary Treatment

The Wapnica wastewater treatment plant is located in the village of Wapnica, within gmina Międzyzdroje, in the województwo zachodniopomorskie region of northwestern Poland. This facility serves a small population of 1,108 residents, reflecting its role in a rural coastal community. The plant is situated close to the Baltic Sea, within 10 km of the coastline, which influences its environmental management priorities. As a secondary treatment facility, the plant provides biological treatment to reduce organic matter and suspended solids before discharge. The plant has a designed capacity of 2,500 m³/day, with an actual discharge volume of 157.98 m³/day, indicating it operates well below its capacity. Under Polish and EU regulations, secondary treatment is the minimum standard for wastewater plants serving agglomerations of this size, as required by the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant discharges treated wastewater into the local watershed, which ultimately drains into the Baltic Sea. The Baltic Sea is a sensitive marine environment with limited water exchange, making nutrient removal important to prevent eutrophication. The plant's coastal location means its discharge contributes to the overall nutrient load in the region, and its performance is critical for protecting coastal water quality and marine ecosystems.

The plant discharges into local watercourses that flow into the Baltic Sea, a semi-enclosed sea with high ecological sensitivity to nutrient pollution. The Baltic Sea suffers from eutrophication due to nitrogen and phosphorus inputs from surrounding countries. The coastal location of the plant means its treated effluent directly influences the water quality of nearby beaches and marine habitats, including spawning grounds for fish and migratory bird stopover sites along the Pomeranian coast.