On 10 April 2015 the German Federal Environmental Agency has formalized the list of metallic materials suitable for contact with drinking water. This list, also called LU List or 4MS Common Composition List, presents a series of paragraphs which are characterized by the main elements constituting the alloy. In paragraph 2.3, for example, are the alloys containing: copper, zinc and lead and then in group B and C: CW617N and CW612N; Group C: CW614N and CW603N.
In the same paragraph listed chemical compositions which in some cases differ with respect to the composition defined in European standards of product. The official publication of the list starts the transitional period of two years and therefore with effect from 10 April 2017 may be used for drinking water only the alloys indicated in the list. The alloy CW602N, for example, must therefore be replaced by 2017 with one of the alloys shown in the list.
The list is formalizing the version of 4 September 2013 while it is already available in the version of 20 January 2015 that waits to be approved the notification of the European Commission.
UBA List or 4MS Positive List: http://www.umweltbundesamt.de/themen/wasser/trinkwasser/trinkwasser-verteilen/anerkennung-harmonisierung-4ms-initiative