Overview
CORIA wastewater treatment plant serves the city of Coria in Extremadura, Spain. It handles a population of approximately 16,700 and discharges into the Alagón River, a tributary of the Tagus.
The CORIA wastewater treatment plant is located in Coria, a municipality in the province of Cáceres, Extremadura, Spain. The plant serves a population of around 16,700, classifying it as a medium-sized agglomeration under Spanish and EU regulations. It is situated inland, away from coastal areas, and its operations are subject to national and European water quality standards. As a plant serving a population between 10,000 and 100,000, it falls under the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment as a minimum. The plant is expected to comply with these standards to protect receiving water bodies. The facility is part of Spain's broader wastewater infrastructure, managed by regional authorities in Extremadura. The treated effluent from CORIA is discharged into the Alagón River, which flows into the Tagus River (Tajo), one of the longest rivers in the Iberian Peninsula. The Tagus ultimately reaches the Atlantic Ocean near Lisbon. The plant plays a key role in maintaining water quality in the Alagón basin, supporting local ecosystems and downstream water uses including agriculture and biodiversity.
Environmental context
The CORIA plant discharges into the Alagón River, a tributary of the Tagus River, which flows westward through Spain and Portugal to the Atlantic Ocean. The Alagón basin supports diverse aquatic life and is important for regional agriculture. The Tagus River is a major ecological corridor, and maintaining water quality in its tributaries is critical for the health of the entire watershed, including downstream wetlands and estuaries.
Frequently asked questions
The CORIA plant is located on Camino del Tamujal in Coria, province of Cáceres, Extremadura, Spain.
The plant serves approximately 16,700 people, classifying it as a medium-sized agglomeration under EU regulations.
The treated wastewater is discharged into the Alagón River, a tributary of the Tagus River.
As a plant serving over 10,000 people, it is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment and, in sensitive areas, tertiary treatment.
In Spain, plants of this scale typically employ secondary biological treatment, such as activated sludge or trickling filters, to meet EU standards for organic matter and suspended solids removal.
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