Drinking water supply system of a building - comprising a drinking water piping system , which comprises a main supply line having a hot water supply line and a cold water supply line , wherein a hot water line of a subordinate supply line is connected to the hot water supply line and wherein a cold water line of the subordinate supply line is connected to the cold water supply line , - comprising a plurality of drinking water tapping points (18, 20, 22, 22', 22", 170) connected to the hot water line and the cold water line , - comprising a central control device , - wherein a central feed point of a local water supplier into the drinking water supply system is provided, - wherein a plurality of sensors is provided, which sensors are configured to determine measurement values for one or different properties of the water carried in the drinking water supply system at different points in the drinking water supply system , - wherein the central control device is configured to receive and evaluate the measurement values determined by the sensors and - wherein one or more of the sensors are configured to determine measurement values for the drinking water quality of the water carried in the drinking water supply system , wherein the control device is configured to monitor the measurement values received from the sensors in regard to an exceedance of or a falling below a limit value and, in case of an exceedance or of a falling below the limit value, to output a corresponding warning notification via a user interface, wherein the limit value is determined from measurement values which have been determined at the central feed point of the local water supplier. - comprising a drinking water piping system , which comprises a main supply line having a hot water supply line and a cold water supply line , wherein a hot water line of a subordinate supply line is connected to the hot water supply line and wherein a cold water line of the subordinate supply line is connected to the cold water supply line , - comprising a plurality of drinking water tapping points (18, 20, 22, 22', 22", 170) connected to the hot water line and the cold water line , - comprising a central control device , - wherein a central feed point of a local water supplier into the drinking water supply system is provided, - wherein a plurality of sensors is provided, which sensors are configured to determine measurement values for one or different properties of the water carried in the drinking water supply system at different points in the drinking water supply system , - wherein the central control device is configured to receive and evaluate the measurement values determined by the sensors and - wherein one or more of the sensors are configured to determine measurement values for the drinking water quality of the water carried in the drinking water supply system , wherein the control device is configured to monitor the measurement values received from the sensors in regard to an exceedance of or a falling below a limit value and, in case of an exceedance or of a falling below the limit value, to output a corresponding warning notification via a user interface, wherein the limit value is determined from measurement values which have been determined at the central feed point of the local water supplier. <EOS>