OLIAS Wastewater Treatment Plant, Magán, Castilla-La Mancha, Spain

OLIAS is a wastewater treatment plant located in Magán, a town in the province of Toledo, within the autonomous community of Castilla-La Mancha, Spain. The plant serves a population of 2,182 and operates under Spain's national water regulations, which align with the European Union's Urban Waste Water Treatment Directive (91/271/EEC). As a small agglomeration, it is required to provide appropriate treatment to protect the receiving environment. The plant provides secondary treatment, which involves biological processes to reduce organic matter and suspended solids. The daily discharge volume is 395.48 cubic meters. The plant's scale is consistent with small municipal systems common in rural areas of central Spain. The treated effluent is discharged into a local watercourse that eventually drains into the Tagus River basin, one of the Iberian Peninsula's major river systems. The Tagus River flows westward through Spain and Portugal, emptying into the Atlantic Ocean near Lisbon. The plant's operations help protect downstream water quality and aquatic ecosystems in the Tagus basin.

The plant discharges into a tributary of the Tagus River, which flows through central Spain and Portugal to the Atlantic Ocean. The Tagus basin supports diverse aquatic life and is an important water resource for agriculture and urban supply. The plant's secondary treatment reduces organic pollution, helping to maintain the ecological health of the downstream river system.