Abstract: According to some embodiments, sewer alarm devices and apparatus are provided for detecting the presence of liquid within a pipe. In some embodiments, the devices and apparatus include a housing including a top portion and a bottom portion, and a probe housing, extending from the bottom portion of the housing to a bottom surface area of the probe housing and sized to fit within an interior of a wye connector, the wye connector having an interior extending into an interior of the pipe. At least a first probe is disposed within the probe housing and exposed to an area between the bottom surface area of the probe housing and the interior of the pipe.