Seica Wastewater Treatment Plant, Tomar, Portugal

Seica is a wastewater treatment plant located in the Cassinheira area of Sabacheira, Tomar, in the Santarém district of Portugal. The facility serves a population of around 15,400, placing it in the medium agglomeration category under EU classification. The plant is situated inland, away from coastal areas, and contributes to the region's sanitation infrastructure. As a Portuguese treatment plant, Seica operates under 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 sensitive. The plant is expected to meet these regulatory standards to protect local water quality. The treated effluent from Seica is discharged into the local watershed, which ultimately drains into the Tagus River basin, one of the Iberian Peninsula's major river systems. The Tagus flows westward through Portugal and into the Atlantic Ocean near Lisbon. The plant plays a key role in safeguarding the ecological health of this important river system and its downstream environments.

Seica discharges into the Tagus River basin, which flows through central Portugal and empties into the Atlantic Ocean. The Tagus supports diverse aquatic life and provides water for agriculture and urban use. The plant's operations help reduce nutrient and pollutant loads, protecting downstream ecosystems and maintaining water quality in this ecologically significant watershed.