Abstract: A basement flood alarm system for use in conjunction with a basement sump pump having a crock within which water is collected includes a sound-emitting device, preferably a foghorn, that is activated whenever the water level in the crock rises above a pre-determined safe level. The level of water within the crock is detected by the use of a sensor, such as a proximity sensor or a float. Preferably the device is powered by a rechargeable battery.