CLAIROIX Wastewater Treatment Plant, Clairoix, Hauts-de-France

The CLAIROIX wastewater treatment plant is located in Clairoix, a commune in the Oise department of Hauts-de-France, France. It serves a population of 3,233 and operates with advanced treatment processes, ensuring high-quality effluent. The plant has a designed capacity of 4,000 m³/day and currently discharges 576.76 m³/day of treated wastewater. As a French wastewater facility, CLAIROIX operates under the European Union's Urban Waste Water Treatment Directive (91/271/EEC), which sets standards for collection, treatment, and discharge. For agglomerations of this size (under 10,000 population equivalent), the directive requires appropriate treatment, and France's national regulations often mandate advanced treatment in sensitive areas. The treated effluent from CLAIROIX 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 ecosystems and providing water for agriculture and industry. The plant's advanced treatment helps protect these downstream environments from nutrient pollution and other contaminants.

The CLAIROIX plant discharges into the Oise River basin, which flows into the Seine River and eventually the English Channel. This watershed supports diverse aquatic life and is an important ecological corridor. The Seine estuary and Bay of Seine are ecologically sensitive areas, hosting migratory fish species and rich biodiversity. Advanced treatment at CLAIROIX helps reduce nutrient loads and protect these downstream ecosystems from eutrophication and pollution.