Erpeldange_Wiltz Wastewater Treatment Plant, Wiltz, Luxembourg

Erpeldange_Wiltz is a wastewater treatment plant located in the town of Erpeldange, within the commune of Wiltz, in the Canton Wiltz of Luxembourg. The facility serves a small population of 112 residents, reflecting its role in a rural or peri-urban setting. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids, meeting the basic standards for effluent quality before discharge. The plant has a designed capacity of 300 m³/day and currently discharges approximately 75.10 m³/day, indicating it operates well below its capacity. Under Luxembourg's implementation of the EU Urban Waste Water Treatment Directive (91/271/EEC), small agglomerations like this are required to provide appropriate treatment, with secondary treatment being standard for inland freshwater discharges. It is assumed to be active given the discharge data. The treated effluent is discharged into a local watercourse, likely a tributary of the Wiltz River, which flows into the Sauer River and eventually the Moselle River, a major tributary of the Rhine. This catchment ultimately drains into the North Sea. The plant plays a key role in protecting the local aquatic ecosystem and downstream water quality in the Rhine basin.

The plant discharges into a small watercourse that feeds the Wiltz River, a tributary of the Sauer River. The Sauer joins the Moselle River, which flows into the Rhine and then the North Sea. The local watershed supports diverse aquatic life, including fish species such as brown trout and grayling, and the area is part of a broader network of rivers that are ecologically sensitive due to agricultural runoff and urban pressures. The plant's secondary treatment helps reduce nutrient loads, mitigating eutrophication risks in downstream waters.