LES Wastewater Treatment Plant, Les, Val d'Aran, Catalunya

The LES wastewater treatment plant is located in Les, a town in the Val d'Aran region of Catalunya, Spain. It serves a population of 1,030 and operates as a secondary treatment facility, managing an average daily flow of 943.63 cubic meters. The plant is situated inland, away from coastal areas, and its operations are part of the regional wastewater infrastructure. As a secondary treatment plant, LES meets the standard requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary biological treatment for agglomerations of this size. The plant's designed capacity of 2,812 cubic meters per day indicates it has room for future growth or peak flows. The facility is operated as part of the municipal wastewater system in the Val d'Aran region. The treated effluent from LES is discharged into local watercourses that ultimately drain into the Garona River (Garonne), which flows north into France and eventually reaches the Atlantic Ocean via the Gironde estuary. The plant plays a key role in protecting the water quality of the Garona basin, which supports diverse aquatic life and is an important ecological corridor in the Pyrenees.

The LES plant discharges into the Garona River basin, which originates in the Val d'Aran and flows through the Pyrenees into France. The river supports a variety of fish species, including trout, and its riparian habitats are ecologically sensitive. Downstream, the Garona joins the Dordogne to form the Gironde estuary, a major Atlantic coastal ecosystem. The plant's secondary treatment helps reduce organic pollution and protect these downstream environments.