SAINT MICHEL CHEF CHEF La Princetiere Wastewater Treatment Plant, Saint-Michel-Chef-Chef, France

The SAINT MICHEL CHEF CHEF La Princetiere wastewater treatment plant is located in Saint-Michel-Chef-Chef, a commune in the Loire-Atlantique department of Pays de la Loire, France. The plant serves a population of 27,550, classifying it as a medium-sized agglomeration under European Union regulations. Its designed capacity is 1.00 (unit unspecified), and it lies within 50 km of the Atlantic coast, indicating potential sensitivity to coastal discharge. As a French wastewater treatment facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations of this size. For plants in sensitive areas, such as coastal zones, tertiary treatment may be mandated to reduce nutrient loads and protect marine environments. The regulatory framework ensures compliance with national and EU standards. The plant's treated effluent likely discharges into the Loire estuary or directly into the Bay of Biscay via local watercourses. The receiving water body is part of the larger Loire basin, which supports diverse aquatic life and is an important ecological corridor. The coastal proximity means the plant must manage nutrient and pathogen loads to prevent eutrophication and protect marine habitats, including shellfish beds and migratory fish populations.

The plant is situated in the Loire-Atlantique region, within the Loire River basin, which drains into the Bay of Biscay (Atlantic Ocean). The downstream environment includes the Loire estuary, a dynamic ecosystem supporting migratory fish such as Atlantic salmon and European eel. Coastal waters in the area are used for shellfish farming and recreation, making nutrient and pathogen control critical. The plant's proximity to the coast (within 50 km) increases the risk of nutrient enrichment in marine waters, potentially affecting phytoplankton blooms and benthic habitats.