Drees & Sommer accompanied the construction and expansion of the wastewater treatment plant in Mersch by providing support and advice on organizational project processes, planning reviews (second opinion) and cost and quality reviews. The plant was completely rebuilt in 3 renovation phases from 2012-2017 during ongoing operation. Furthermore, Drees & Sommer has been using CONTRACE since 2014 to oversee defect management until the end of the project.