Perthes en Gâtinais Wastewater Treatment Plant, Cély, France

Perthes en Gâtinais is a wastewater treatment plant located in Cély, within the Seine-et-Marne department of France. It serves a population of 3,950 people and is part of the municipal infrastructure for the Fontainebleau area. The plant operates with advanced treatment, ensuring high-quality effluent before discharge. With a designed capacity of 4,500 m³/day and an average daily discharge volume of 704.67 m³/day, the plant operates well below its capacity. As a French facility, it complies with national regulations transposing the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates advanced treatment for sensitive areas. The plant's advanced treatment level aligns with requirements for protecting downstream water bodies. The treated effluent is discharged into the local watershed, which ultimately drains into the Seine River basin. The Seine River flows through Paris and into the English Channel, supporting diverse aquatic life and providing water for agriculture and industry. The plant's advanced treatment helps reduce nutrient loading and protect the ecological health of the Seine estuary.

The plant discharges into the Seine River basin, which flows through the Île-de-France region and eventually reaches the English Channel. The Seine estuary is an ecologically sensitive area that supports migratory fish species and provides critical habitat for birds. Advanced treatment at this plant helps minimize nutrient pollution, protecting downstream water quality and the marine environment.