Spala Wastewater Treatment Plant, Spała, województwo łódzkie, Poland

The Spala wastewater treatment plant is located in Spała, a town in the gmina of Inowłódz, powiat tomaszowski, województwo łódzkie, Poland. The facility serves a population of approximately 300 people, classifying it as a very small agglomeration under Polish and EU regulations. As a primary treatment plant, Spala provides basic mechanical treatment such as screening and sedimentation. Under the EU Urban Waste Water Treatment Directive (91/271/EEC), small agglomerations with a population equivalent below 2,000 are generally required to provide appropriate treatment, which may include primary treatment if the receiving waters are not sensitive. The plant's designed capacity is 1,183 m³/day, with a current discharge volume of 42.78 m³/day, indicating low utilization. The plant discharges treated wastewater into a local watercourse that ultimately drains into the Pilica River, a tributary of the Vistula River, which flows into the Baltic Sea. The Pilica River supports diverse aquatic life and is an important ecological corridor in central Poland. The plant's primary treatment level means that nutrient removal is limited, which could impact downstream water quality if not managed properly.

The Spala plant discharges into a local stream that feeds into the Pilica River, a major tributary of the Vistula River. The Vistula flows northward into the Baltic Sea, making the plant part of a large transboundary watershed. The Pilica River valley hosts diverse ecosystems, including riparian forests and wetlands that support birdlife and fish species. The plant's primary treatment level means that only basic solids removal occurs, with limited reduction of organic matter and nutrients, which could contribute to eutrophication in downstream waters if not adequately diluted.