Disclosed is a drain blockage responsive alarm system. The drain blockage responsive alarm system comprises a cleanout cap member, at least one drain blockage responsive element, and an alarming module. The cleanout cap member is capable of being installed at a portion of a drain pipe. Further, the at least one drain blockage responsive element is configured to the cleanout cap member adapted to sense clog deposition at the portion of the drain pipe, and to generate an output signal upon sensing the clog deposition. Furthermore, the alarming module is electrically coupled to the at least one drain blockage responsive element for generating an alarm signal upon receiving the output signal.