In the European Union (EU) Horizon 2020 (H2020) project NextGen, 24 technologies related to circular economy in the water sector were investigated at 10 case studies distributed across Europe. The technologies are involved in water management and recovery, material recovery and energy recovery. In this context, a database containing information and data referring to those technologies was developed. The database is called technology evidence base (TEB), is open access and hosted by Water Europe as part of the Marketplace (https://mp.watereurope.eu/).