If anyone is considering a moisture alarm, I would go one step further and get the system which shuts off the water supply. These systems use moisture sensor discussed here that sends a signal to the shutoff valve when water is detected. It solves the problem of you not being home to do anything about a water leak situation.
And these systems support multiple sensors. So you can place sensors at other places in your home which you want monitored; such as the laundry room.
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