The Uebersyren treatment plant in Luxembourg treats urban waste water from various nearby towns, as well as waste water from the airport. As the plant is at the limits of its capacity in its present state, it is to be expanded. This requires a renewal of the plant, which will include the operational buildings. The estimated construction time is eight years and is expected to be completed in 2028. Drees & Sommer is supporting the project with project control services and partial project management services.