PLOUHINEC Manester Wastewater Treatment Plant, Le Magouëro, Brittany

PLOUHINEC Manester is a municipal wastewater treatment facility located in Le Magouëro, Plouhinec, within the Morbihan department of Brittany, France. The plant serves a population of 6,133, placing it in the small-to-medium agglomeration category under French and EU regulations. As a French plant, it operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. The directive also mandates more advanced treatment if the discharge enters a sensitive area. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Atlantic Ocean via the coastal waters of southern Brittany. The region's estuaries and coastal zones support diverse marine life and are important for local fisheries and tourism. Proper treatment helps protect these sensitive coastal ecosystems from nutrient pollution and pathogens.

The plant discharges into the watershed of the Ria d'Etel, a coastal estuary that flows into the Bay of Biscay (Atlantic Ocean). This estuary is ecologically sensitive, supporting diverse aquatic life including migratory fish species and serving as a nursery for marine organisms. The coastal waters of southern Brittany are known for their high biodiversity and are important for local fishing and aquaculture industries.