Das Projekt "Entwicklung harmonisierter Tests fuer die Anwendung im europaeischen Genehmigungsverfahren fuer Bauwerkselemente, die mit Trinkwasser in Kontakt kommen" wird vom Umweltbundesamt gefördert und von DVGW Deutscher Verein des Gas- und Wasserfaches e.V. - Technisch-wissenschaftlicher Verein - Technologiezentrum Wasser (TZW) durchgeführt. Several materials are used for the distribution of drinking water to the consumer. Compounds that were used to produce these 'construction products in contact with drinking water' (CPDW) can be released into the drinking water, drunken by the consumer and cause adverse health effects. CPDW are related to the implementation of the Construction Product Directive and the Drinking Water Directive. CPDW are subject to approval by National Schemes. This creates various approval criteria among the Member States and barriers to trade. To overcome these two problems the set up of a European Approval Scheme (EAS) for CPDW was initiated by Enterprise DG. Before the EAS can become operative the Regulators Group on CPDW defined four test methods that must be developed and harmonised (potential to promote microbial growth, cyto-/genotoxicity, screening for unsuspected compounds by GC-MS and potential to form disinfectant by-products) which is described in this proposal.