Saint-Germain-du-Puch Wastewater Treatment Plant, Nouvelle-Aquitaine, France

The Saint-Germain-du-Puch wastewater treatment plant is located in the commune of Saint-Germain-du-Puch, within the Gironde department of Nouvelle-Aquitaine, France. It serves a population of 1,134 residents, classifying it as a small agglomeration under French regulations. The plant provides secondary treatment, meeting the minimum standard required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland agglomerations of this size. With a designed capacity of 2,200 m³/day and an average discharge volume of 202.30 m³/day, the facility operates well below its capacity, indicating potential for future growth. Treated effluent is discharged into the local watershed, which ultimately drains into the Dordogne River and then the Gironde estuary, a major ecological and economic asset on the Atlantic coast. The plant plays a key role in protecting downstream water quality in this sensitive estuarine environment.

The plant discharges into a tributary of the Dordogne River, which flows into the Gironde estuary, the largest estuary in Western Europe. This estuary supports diverse aquatic life, including migratory fish species such as salmon and sturgeon, and is an important nursery for marine fish. The secondary treatment provided helps reduce organic pollution and nutrient loads, safeguarding the ecological balance of the downstream water bodies.