S Pedro Wastewater Treatment Plant, Montemor-o-Novo, Portugal

S Pedro is a wastewater treatment plant located in Montemor-o-Novo, Évora, Portugal, serving a population of around 8,000 people. The facility is situated inland, away from coastal areas, and plays a key role in managing municipal wastewater for the region. As a plant serving a medium-sized agglomeration, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for populations between 2,000 and 10,000 in normal areas. The plant's treatment processes are designed to meet these standards, ensuring compliance with Portuguese and European regulations. The treated effluent is discharged into local watercourses that eventually drain into the Tagus River basin, which flows into the Atlantic Ocean near Lisbon. The plant's operation helps protect downstream water quality and supports the ecological health of the region's rivers and estuaries.

The plant discharges into local streams that are part of the Tagus River basin, one of the Iberian Peninsula's major river systems. The Tagus flows westward through Portugal and empties into the Atlantic Ocean at the Tagus Estuary, a vital habitat for migratory birds and aquatic species. The plant's treatment helps reduce nutrient and pollutant loads, safeguarding water quality in this ecologically important watershed.