Yes, a residential dishwasher can occasionally develop a water leak even when the appliance is completely turned off and not running a cycle. This type of passive leak is almost always caused by a faulty water inlet valve that fails to close completely, allowing household water pressure to slowly seep past the diaphragm and fill the tub until it overflows onto the floor, or by a leaking sink drain connection backing up into the unit. You can troubleshoot passive leaks easily by checking the water supply shut-off valve. You can verify that your corrective action is successful when closing the manual water supply valve beneath your sink and observing that the dishwasher stays completely dry confirms that a faulty inlet valve is the root cause.
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