Water-sensing alarm for water-control systems

In a water control system for admitting exterior ground water into a subterranean room, channeling it into a sump pump reservoir having a cover and containing a water level-actuated sump pump, and automatically pumping the water therefrom whenever the water level rises to the pump-activation level, the improvement which comprises an alarm which is activated whenever the water level in the sump pump reservoir rises above the pump-actuation level, said alarm comprising an open electrical circuit including a power source, an audible warning means and an elongate, removable probe member comprising an elongate housing having an upper stop member and a lower contact end containing exposed spaced contacts which, when immersed in water, close said circuit to activate said audible warning means, said probe member housing extending through an opening in said reservoir cover and being supported by engagement between said probe stop member and the upper surface of said cover, the contact end of said probe member being contained within the sump pump reservoir, supported at a predetermined alarm activation level, above said sump pump actuation-level, to provide an audible warning whenever the water level rises to said alarm-activation level.