Port-Brillet Wastewater Treatment Plant, Pays de la Loire, France

The Port-Brillet wastewater treatment plant is located in the commune of Port-Brillet, within the Mayenne department of Pays de la Loire, France. It serves a population of approximately 6,280 people, classifying it as a small to medium agglomeration under European Union classification. The plant is situated inland, more than 50 kilometers from the coast, and its operations are part of the regional wastewater infrastructure managed by local authorities. As a French wastewater facility, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for agglomerations with a population equivalent (PE) between 2,000 and 10,000. For plants serving around 6,280 people, secondary treatment is the minimum standard, ensuring that organic matter and suspended solids are effectively reduced before discharge. The treated effluent from the Port-Brillet plant is discharged into local watercourses that ultimately drain into the Mayenne River, a tributary of the Maine River, which flows into the Loire River and eventually reaches the Atlantic Ocean. The Loire basin is ecologically significant, supporting diverse aquatic life and providing important habitats for migratory fish species such as Atlantic salmon and European eel. The plant's compliance with EU standards helps protect the water quality of these downstream environments.

The Port-Brillet plant discharges into local streams that feed the Mayenne River, part of the larger Loire River basin. The Loire is one of Europe's last wild rivers, supporting a rich biodiversity including migratory fish like Atlantic salmon and shad. The watershed is ecologically sensitive, with wetlands and floodplains that provide critical habitat for waterbirds and amphibians. Protecting water quality through adequate treatment is essential to maintain the ecological health of this downstream river system.