Faches Thumesnil Lille CU Houplin Ancoisne Wastewater Treatment Plant, Haubourdin

Faches Thumesnil Lille CU Houplin Ancoisne is a wastewater treatment plant located in Haubourdin, within the Lille metropolitan area in the Hauts-de-France region of northern France. The plant serves a population of approximately 130,774, classifying it as a large agglomeration under EU regulations. As a facility serving over 100,000 people, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment as a minimum and tertiary treatment in sensitive areas. The plant is part of the integrated wastewater management system for the Lille urban area, managed by the local public authority. The treated effluent is discharged into the local water network that ultimately drains into the Deûle River, a tributary of the Lys River, which flows into the Scheldt estuary and the North Sea. The plant plays a key role in protecting the water quality of the Deûle and downstream ecosystems.

The plant discharges into the Deûle River, which flows through the Lille metropolitan area before joining the Lys River. The Lys then drains into the Scheldt estuary, which empties into the North Sea. This watershed supports diverse aquatic life and is an important ecological corridor in the region. The plant's treatment performance is critical to maintaining water quality in this densely populated and industrialized area.