ARAGNOUET Eget Wastewater Treatment Plant, Aragnouet, Occitanie

ARAGNOUET Eget is an advanced wastewater treatment facility located in the commune of Aragnouet, within the Hautes-Pyrénées department of Occitanie, France. Situated in the Pyrenees mountain range near the ski resort of Piau-Engaly, the plant serves a population equivalent of about 2,500, primarily supporting local residents and seasonal tourism infrastructure. The plant employs advanced treatment processes, which go beyond the secondary treatment required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. With a designed capacity of 6,000 cubic meters per day and a current discharge volume of 446 cubic meters per day, the facility operates well within its capacity, ensuring effective treatment of wastewater even during peak tourist seasons. The treated effluent is discharged into local watercourses that drain into the Neste d'Aure river, a tributary of the Garonne River system. This river network ultimately flows into the Atlantic Ocean via the Gironde estuary. The advanced treatment helps protect the sensitive mountain aquatic ecosystems and downstream water quality in the Garonne basin.

The plant discharges into the Neste d'Aure river, which flows into the Garonne River and eventually reaches the Atlantic Ocean via the Gironde estuary. The Pyrenean watershed supports diverse aquatic life, including migratory fish species such as salmon and trout. Advanced treatment at this facility helps minimize nutrient loading and protects the ecological integrity of these high-altitude streams and downstream habitats.