Drinking water must be hygienically safe. In order to ensure this, the Drinking Water Ordinance (TrinkWV) and material-dependent assessment principles stipulate requirements including material compositions. In order to ensure hygienic harmlessness, complex verification procedures may even be required. In the area of catering equipment, these specifications must be applied to all machines/devices if they are connected to the water supply. The scope of validity includes all components up to the first safety device of the machine/device.