An illuminatable drain plug for use in residential or commercial water receptacles communicating with a drain pipe. The drain plug includes a base having a top, a bottom, and a cylindrical sidewall extending between the top and bottom. A circular elastomeric sealing means extends outwardly from the cylindrical sidewall of the base and adapted to fit within the drain pipe in water sealing engagement therewith. A light chimney extends upwardly from the top of the base. A light source and means for actuating the light source is located within the base. Upon actuation the light source communicates its light with the light chimney and/or base and is emitted therefrom.