MONTPON MENESTEROL Wastewater Treatment Plant, Montpon-Ménestérol, France

The MONTPON MENESTEROL wastewater treatment plant is located in Montpon-Ménestérol, a commune in the Dordogne department of Nouvelle-Aquitaine, southwestern France. The facility serves a population of approximately 2,990 residents and has a designed capacity of 7,000 m³ per day, with an actual discharge volume of 533.41 m³ per day, indicating it operates well below its capacity. As an advanced treatment plant, it goes beyond secondary treatment to remove nutrients and other pollutants, aligning with the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for sensitive areas. For agglomerations of this size (under 10,000 population equivalent), the directive mandates appropriate treatment, and the advanced level here suggests the receiving environment may be sensitive or the plant is designed for high effluent quality. The plant discharges treated wastewater into a local watercourse that ultimately drains into the Isle River, a tributary of the Dordogne River, which flows into the Gironde estuary and the Atlantic Ocean. The advanced treatment helps protect the aquatic ecosystem of the Isle and Dordogne rivers, which support diverse fish populations and are important for regional biodiversity.

The treated effluent from MONTPON MENESTEROL enters a local stream that flows into the Isle River, a major tributary of the Dordogne River. The Dordogne River system is ecologically significant, supporting species such as Atlantic salmon and European eel. The advanced treatment level reduces nutrient loading, helping to prevent eutrophication in the downstream Gironde estuary, a critical habitat for migratory birds and marine life.