Abstract: The invention relates to a device for making a liquid safe, that comprises a sterilizer including an ultraviolet lamp, and a sensor for measuring the ultraviolet radiation and connected to an electronic board. An actuator is connected to the electronic board driving the opening of an electrovalve in order to dispense or stop dispensing the liquid, said electrovalve being provided upstream from the sterilizer relative to the liquid flow direction. The electronic board controls the opening of the electrovalve when the sensor measures an ultraviolet amount higher than a predetermined threshold for a given amount of liquid. The device is further fitted with a flow rate adjustment means adapted to the predetermined threshold. The invention also relates to a method for implementing said device.