TALES SUERAS Wastewater Treatment Plant, Onda, Comunitat Valenciana, Spain

TALES SUERAS is a wastewater treatment plant located in Onda, within the Comunitat Valenciana region of Spain. The plant serves a population equivalent of 1,111 and is part of the municipal wastewater infrastructure for the area. It is situated inland, more than 10 km from the coast, and discharges treated water into local watercourses. The plant provides 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. The designed capacity is 5,550 m³/day, with an average daily discharge volume of 217.92 m³/day, indicating a utilization rate well below capacity. The plant operates under Spain's national regulations implementing the EU directive. The treated effluent likely flows into the Mijares River basin, which drains into the Mediterranean Sea near Castellón de la Plana. The receiving water body supports diverse aquatic life and is important for regional agriculture and tourism. Proper treatment helps protect downstream ecosystems and coastal water quality.

The plant discharges into the Mijares River basin, which flows into the Mediterranean Sea at the Gulf of Valencia. The river supports a variety of freshwater species and is used for irrigation in the surrounding agricultural areas. Downstream, the coastal zone includes ecologically sensitive habitats such as seagrass meadows and wetlands that rely on good water quality. Effective wastewater treatment is essential to prevent nutrient enrichment and protect marine biodiversity.