Lamorlaye Wastewater Treatment Plant, Oise, Hauts-de-France

The Lamorlaye wastewater treatment plant is located in the commune of Lamorlaye, within the Oise department of the Hauts-de-France region in northern France. The facility serves a population of approximately 7,300 people, classifying it as a small to medium agglomeration under French and EU regulations. Its address is Allée Verte, ZAC de la Seigneurie, Lamorlaye. As a French wastewater treatment plant serving fewer than 10,000 population equivalents, Lamorlaye operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment for discharges into freshwater systems. The plant is subject to national regulations enforced by the French water agencies (Agences de l'eau), which set discharge standards based on the sensitivity of the receiving environment. Facilities of this scale typically employ biological treatment followed by clarification. The treated effluent from Lamorlaye is discharged into the local hydrographic network, which ultimately drains into the Oise River, a major tributary of the Seine. The Seine River flows through Paris and into the English Channel at the Seine Bay. The plant plays a role in protecting the water quality of the Oise and Seine rivers, supporting aquatic life and downstream water uses.

The Lamorlaye plant discharges into the Oise River basin, which flows into the Seine River and eventually reaches the English Channel. The Oise River supports diverse aquatic ecosystems, including fish species such as pike and perch, and provides habitat for migratory birds along its floodplains. The Seine estuary is an ecologically sensitive area that supports important fisheries and bird populations. The plant's treatment helps reduce nutrient and pollutant loads to these downstream waters.