Grande Covilha Wastewater Treatment Plant, Covilhã, Portugal

Grande Covilha is a wastewater treatment plant located in Boidobra, Covilhã, in the Castelo Branco district of Portugal. It serves a population equivalent of 63,800, classifying it as a medium-to-large agglomeration under EU regulations. The plant is situated inland, approximately 50 km from the coast, and discharges into the local watershed. As a Portuguese facility, Grande Covilha operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations with a population equivalent above 15,000. For sensitive areas, tertiary treatment may be mandated. The regulatory framework ensures compliance with discharge standards to protect receiving water bodies. The plant's treated effluent likely enters the Zêzere River, a tributary of the Tagus River, which flows westward to the Atlantic Ocean near Lisbon. The Tagus basin supports diverse aquatic life and is an important water resource for central Portugal and Spain. The plant's operation contributes to maintaining water quality in this ecologically significant river system.

Grande Covilha discharges into the Zêzere River, a tributary of the Tagus River, which ultimately flows into the Atlantic Ocean near Lisbon. The Tagus basin is a major hydrological system supporting diverse aquatic ecosystems, including migratory fish species such as the European eel and lamprey. The plant's treatment performance is critical to preventing nutrient enrichment and maintaining water quality in this ecologically sensitive watershed.