MOGNEVILLE Wastewater Treatment Plant, Laigneville, Hauts-de-France

MOGNEVILLE is a wastewater treatment plant located in Laigneville, within the Oise department of Hauts-de-France, France. It serves a population of approximately 20,900, classifying it as a medium-sized agglomeration under EU regulations. The plant is situated in an inland area, over 50 km from the coast. As a French facility, MOGNEVILLE operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this size. The directive also requires more advanced treatment if the receiving waters are sensitive to eutrophication. The regulatory framework ensures compliance with European standards. The plant discharges treated wastewater into local water bodies that eventually drain into the Oise River, a major tributary of the Seine River. The Seine flows through Paris and into the English Channel, supporting diverse aquatic life and serving as an important ecological corridor. The plant plays a key role in protecting downstream water quality and the broader Seine basin ecosystem.

The MOGNEVILLE plant discharges into local waterways that feed the Oise River, a major tributary of the Seine River. The Seine basin supports diverse aquatic ecosystems and is an important migratory corridor for fish species. The plant's operations help protect downstream water quality in the Seine River and ultimately the English Channel, reducing nutrient loads that could contribute to eutrophication in coastal waters.