POMMEUSE Wastewater Treatment Plant, Lavanderie, Seine-et-Marne, France

The POMMEUSE wastewater treatment plant is located in Lavanderie, a locality within the commune of Pommeuse in the Seine-et-Marne department of north-central France. The plant serves a population of approximately 7,120 people, placing it in the small-to-medium agglomeration category under EU classification. It is situated near the Grand Morin river, a tributary of the Marne River, which ultimately flows into the Seine. As a French wastewater facility serving fewer than 10,000 people, the plant is subject to the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires secondary treatment for all discharges from agglomerations above 2,000 population equivalent. French regulations transpose this directive through the Code de l'Environnement, and plants of this size are typically monitored by local water agencies (Agences de l'Eau). The regulatory framework ensures compliance with effluent standards for organic matter and suspended solids. The plant discharges treated wastewater into the local hydrological network, which drains into the Grand Morin river. This river flows into the Marne, a major tributary of the Seine, which passes through Paris before reaching the English Channel. The Seine basin supports diverse aquatic life and is an important ecological corridor in the Île-de-France region. The plant's operation contributes to protecting downstream water quality in this densely populated and agriculturally active watershed.

The POMMEUSE plant discharges into the Grand Morin river, a tributary of the Marne River, which joins the Seine River upstream of Paris. The Seine ultimately flows into the English Channel via the Seine estuary. The watershed supports a mix of agricultural land and urban areas, and the river system is ecologically sensitive, providing habitat for fish species such as pike and barbel. The plant's treatment helps maintain water quality in this important regional waterway.