Abstract: A water level sensing device includes a housing having a bottom opening and a micro-switch mounted in the housing above its bottom and provided with a spring loaded horizontally projecting actuating arm. An upper support arm depends from the actuating arm and terminates in a horizontal leg and a bottom horizontal arm is vertically adjustably supported on a wall of the housing below the horizontal leg. A loop of water absorbent paper is engaged and stretched between the horizontal arm and leg and retains the switch arm in actuated position until the loop is wetted and weakened to rupture and releases the switch arm to a deactuated position.