Abstract: A fluid level detector and alarm apparatus for detecting a fluid level in a liquid receiving open-top vessel such as sinks, tubs and the like, comprising: a housing being connectable to the vessel so as to be positioned within the vessel. A sound emitter is positioned within the housing, the sound emitter being actuatable to emit a sound alarm. A circuit interconnects the sound emitter to the power source and has opposed ends emerging out of the housing. A floater unit has a conductive member thereon and is operatively connected to the housing so as to be displaceable with respect to the housing to a contacting position in which the conductive member contacts the opposed ends of the circuit to actuate the sound emitter, whereby the floater unit is displaced to the contacting position by buoyant forces exerted on the floater unit as a result of the fluid level in the vessel reaching the predetermined level, such that a sound alarm is emitted.