ORROUY Wastewater Treatment Plant, Orrouy, Hauts-de-France, France

The ORROUY wastewater treatment plant is located in Orrouy, a commune in the Oise department of Hauts-de-France, France. The plant serves a population of approximately 1,858 residents and operates with advanced treatment capabilities, reflecting a high standard of wastewater management for a small agglomeration. With a designed capacity of 2,500 m³/day and an average discharge volume of 331.46 m³/day, the plant operates well below its capacity, indicating potential for future growth. As a French facility, it complies with the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which mandates appropriate treatment levels based on population equivalents and receiving water sensitivity. The plant's treated effluent is discharged into the local watershed, which ultimately drains into the Oise River, a major tributary of the Seine. The Seine River flows through Paris and into the English Channel, supporting diverse aquatic life and providing water for agriculture and industry. Advanced treatment helps protect downstream ecosystems from nutrient pollution and other contaminants.

The ORROUY plant discharges into the Oise River basin, which flows into the Seine River and eventually the English Channel. The Seine estuary is an ecologically sensitive area that supports migratory fish species and diverse bird populations. Advanced treatment at this plant helps reduce nutrient loads and protect water quality in the downstream river system.