Abstract: The present invention is a water level detector or flood alarm device which will activate a warning once water has reached a pre-determined and potentially damaging or dangerous level. The present invention comprises a housing which maintains a conventional mercury activated float switch, an alarm coupled to the switch, a mounting device, and an attaching mechanism. The mounting device maintains the housing and includes a pivotal mechanism for enabling the housing to pivot and rotate. This pivoting and rotation will allow the housing to be angularly positioned, with respect to the ground, so that the float switch will be positioned horizontally and parallel with respect to the water. The attaching mechanism enables the device to be removably secured to any surface and to be maintained in a secured and installed position.