Mestanza Wastewater Treatment Plant | Castilla-La Mancha, Spain

The Mestanza wastewater treatment plant is located in the town of Mestanza, in the province of Ciudad Real, within the autonomous community of Castilla-La Mancha, Spain. It serves a population of approximately 2,460 residents, making it a small-scale municipal facility. The plant is situated inland, away from coastal areas, and its operations are part of the regional water management infrastructure. The plant operates with secondary treatment, which is the standard biological treatment required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local watercourse, which ultimately drains into the Guadiana River basin, one of the major river systems in the Iberian Peninsula. The Guadiana River flows westward, forming part of the border between Spain and Portugal, before emptying into the Gulf of Cádiz (Atlantic Ocean). The plant's operations contribute to protecting the water quality of this important basin, supporting both ecological health and downstream water uses.

The plant discharges into a tributary of the Guadiana River basin, which is a major hydrological system in southwestern Europe. The Guadiana River supports diverse aquatic ecosystems and is an important migratory corridor for fish species. The basin also provides water for agriculture and human consumption. The plant's secondary treatment helps reduce organic pollution and nutrient loads, protecting the ecological integrity of the receiving waters and the downstream Atlantic coastal environment.