Le Mont Saint Michel Wastewater Treatment Plant, Pontorson, Normandy

Le Mont Saint Michel wastewater treatment plant is located in Pontorson, in the Normandy region of France. It serves a population of approximately 4,000 people, providing secondary treatment to municipal wastewater. The plant has a designed capacity of 5,000 cubic meters per day and currently discharges an average of 713.59 cubic meters daily. As a secondary treatment facility, the plant meets the requirements of the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The directive mandates secondary treatment for populations between 2,000 and 10,000 in normal areas, and more stringent treatment if discharging into sensitive areas. The plant's proximity to the coast may influence its regulatory obligations. The plant is situated within 10 km of the coast, and its treated effluent ultimately reaches the Baie du Mont Saint-Michel, a UNESCO World Heritage site and a major tourist destination. The bay is an ecologically sensitive area supporting diverse birdlife and marine habitats. The plant plays a crucial role in protecting this unique coastal environment from nutrient pollution and pathogens.

The plant discharges into the Baie du Mont Saint-Michel, a large tidal bay on the English Channel coast of Normandy. This bay is a critical habitat for migratory birds and supports a rich ecosystem of marine life. The plant's secondary treatment helps reduce organic load and pathogens, protecting the bay's water quality and the tourism-dependent local economy.