CWARRIX, I was thinking too complicated. Sorry. A simple cheap water detector is a spring loaded clothes pin with a couple small machine screws. You put a screw through each of the parts that pinch together and use thte screws for N.O. (close to alarm) sensor contacts. Then place a pill between the heads of the screws to hold them apart. If the sensor is submerged the pill dissolves and the screws make contact.

If you wire a bicycle horn or other alarm in series with the sensor it will sound when the pill melts. Or go hi-tech and have it call our cell phone.

A number of sensors can be wired in parallel with one alarm device but you won't know which one is alarming when it trips. In your situation, that is fine as if ANY one trips the water gets turned off. You need to "invert" the logic so wire the sensors in parallel so that if any sensor trips a relay is energized. A water control solenoid that closes when energized could be powered by a set of N.O. contacts on the relay.

If you have trouble finding a water controller that shuts off when energized, use one that has to be energized to flow water (same style as in a dishwasher.) This requires the relay to be energized all the time for water to be available so select a continuous duty relay. This last approach has the addedbenefit (feature?) of turning your water off in case of electrical outage.

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