Abstract: A toilet fill valve assembly for filling a toilet tank with water includes a tube assembly sized and shaped so as to be mounted in the toilet tank and to receive a supply of water. The fill valve assembly also includes a fill valve, which is connected to the tube assembly and having an open state and closed state, and a float, which is coupled to the fill valve for moving the fill valve between the open and closed states. Moreover, a first sensor is coupled to at least one of the tube assembly and the float for detecting the position of the float, while a second sensor is coupled to the tube assembly for sensing water flow through the tube assembly. A controller is also coupled to the first sensor and the second sensor for receiving signals therefrom so as to determine whether a leak condition is present in the toilet tank. The tube assembly, the fill valve, the float, the first sensor, the second sensor and the controller are integrated with one another as a single unit.