Methodologies, systems, and computer-readable media are provided for containing fluid from an overflowing toilet. An annular fluid containment basin is located near the base of a toilet and is configured to encircle the base of the toilet and collect fluid flowing down the exterior surface of the toilet. A moisture sensor is located within the annular fluid containment basin and configured to sense a spill. A drain is also located within the annular fluid containment basin to direct fluid to bypass an S-bend or trap connected to the toilet.