Rio Maior Wastewater Treatment Plant: Serving Rio Maior, Portugal

The Rio Maior wastewater treatment plant is located in the industrial zone of Rio Maior, Santarém District, Portugal. It serves a population of approximately 11,800, classifying it as a medium-sized agglomeration under EU regulations. The plant is situated inland, away from the coast, and its operations are part of the municipal wastewater infrastructure for the town. As a Portuguese facility, the plant is subject to 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 designated as sensitive areas. The plant's design capacity is 1.00 (likely in thousands of cubic meters per day), indicating a scale appropriate for the population served. The treated effluent is discharged into local watercourses that ultimately drain into the Tagus River basin, one of the major river systems in the Iberian Peninsula. The Tagus River flows westward to the Atlantic Ocean near Lisbon. The plant plays a key role in protecting the local watershed from untreated wastewater, supporting water quality in the region's rivers and downstream ecosystems.

The plant discharges into local streams that are part of the Tagus River basin, which drains into the Atlantic Ocean near Lisbon. The Tagus estuary is an ecologically important area supporting diverse aquatic life and migratory bird species. The plant's treatment helps maintain water quality in this sensitive downstream environment, particularly given the agricultural and industrial activities in the region.