You can get moisture detector for some smart home systems/alarms, that is installed under laundry/dishwasher. Also that is why all houses at least here have to

You can get moisture detector for some smart home systems/alarms, that is installed under laundry/dishwasher. Also that is why all houses at least here have to have faucet/valve for laundry/dishwashers, and that is supposed to be kept closed when the machine is not in use. My faucet in kitchen for dishwasher actually has a simple electronic valve, that automagically closes the valve after several hours.