Abstract: A bathtub water level warning device for activating an audible and/or visible warning indicator when the water level in a bathtub approximately reaches a predetermined level, comprising a watertight case including a float element, a tubular stem element and a tubular pivot element. The alarm device is an independent device which floats free of the bathtub upon the bathtub reaching a filled condition, therefore allowing removal or inclusion of the device in a bathtub as desired by a user, such as during filling only. The alarm device includes a power source, a gravity switch, and an audible and/or visible warning indicator is internally mounted in the alarm device. Gravity causes the switch to close when the alarm device is in a substantially vertical orientation.