Method for monitoring a domestic water installation, in particular a water treatment system, comprising - a central supply line for water with a flow meter and a closure element, - a plurality of tapping points (8a, 8b, 8c, 8d) which can each be opened or closed individually by means of valve devices (9a, 9b, 9c, 9d), wherein on at least one tapping point (8a, 8b) a sensor (10a, 10b) for detecting a state of the tapping point (8a, 8b) is arranged, - an electronic control device to which measurement signals from the flow meter and the sensor(s) (10a, 10b) are fed, wherein the electronic control device causes the closure element to close when the instantaneous flow rate or the time duration of an uninterrupted water withdrawal or the water volume tapped without interruption exceed a first limit value GW1 which is stored in the electronic control device or can be queried by the electronic control device, wherein the first limit value GW1 is replaced by a second variably predetermined limit value GW2 which is stored in the electronic control device or can be queried by the electronic control device if a sensor (10a, 10b) for detecting a state of a tapping point (8a, 8b) signals a water withdrawal, wherein the following applies to the limit values: GW2 > GW1, and wherein the second limit value GW2 is selected in dependence on the location of use of the sensor (10a, 10b) which signals a water withdrawal, characterized in that the second limit value GW2 for a tapping point (8a, 8b) is replaced by the first limit value GW1 if a sensor (10a, 10b) detects that the current state of the associated tapping point (8a, 8b) does not signal a water withdrawal, or when the valve device (9a, 9b) of the tapping point (8a, 8b) is closed. - a central supply line for water with a flow meter and a closure element, - a plurality of tapping points (8a, 8b, 8c, 8d) which can each be opened or closed individually by means of valve devices (9a, 9b, 9c, 9d), wherein on at least one tapping point (8a, 8b) a sensor (10a, 10b) for detecting a state of the tapping point (8a, 8b) is arranged, - an electronic control device to which measurement signals from the flow meter and the sensor(s) (10a, 10b) are fed, wherein the electronic control device causes the closure element to close when the instantaneous flow rate or the time duration of an uninterrupted water withdrawal or the water volume tapped without interruption exceed a first limit value GW1 which is stored in the electronic control device or can be queried by the electronic control device, wherein the first limit value GW1 is replaced by a second variably predetermined limit value GW2 which is stored in the electronic control device or can be queried by the electronic control device if a sensor (10a, 10b) for detecting a state of a tapping point (8a, 8b) signals a water withdrawal, wherein the following applies to the limit values: GW2 > GW1, and wherein the second limit value GW2 is selected in dependence on the location of use of the sensor (10a, 10b) which signals a water withdrawal, characterized in that the second limit value GW2 for a tapping point (8a, 8b) is replaced by the first limit value GW1 if a sensor (10a, 10b) detects that the current state of the associated tapping point (8a, 8b) does not signal a water withdrawal, or when the valve device (9a, 9b) of the tapping point (8a, 8b) is closed.