There are two general areas where you will commonly find water leaking from a dishwasher.
The first is from around the door; water will generally show up on the kitchen floor in front of the dishwasher.
The second is from some component under the tub. The most common sources are pump seals and water valves, though they really can come from just about anything else under there, such as heater mounts, float switches, dryer fans, hoses, etc.
A slow, under-tub leak may go years without being detected. Often the tile or linoleum in front of the dishwasher is slightly raised, and water does not flow uphill. A slow leak beneath the tub can rot a wooden floor or cabinetry. It can also cause odors, mildew, etc. Often the first sign you might see is water leaking under the cabinetry and into the space beneath the kitchen sink.
It pays to pull off the kickplate every six months or so and look around under there with a flashlight for any sign of a drip. Do it while the machine is running. Also, check the hot water shutoff valve beneath the sink for leaks, and exercise it; open and close it a couple of times and make sure it works so that you will be able to shut it off when you need to.
The third source of water "leakage" (though it really isn't a leak) is from the air gap.
The air gap is an anti-backflow device installed in the drain line to prevent the dishwasher from accidentally siphoning fluid from your house's sewer line back into the dishwasher tub. If this air gap or the house's drain line becomes clogged, water can run out of the air vent, and generally, it runs straight into your sink. Note, however, that this will only occur when the dishwasher is operating in the "pump out" mode, trying to drain the tub
Using the wrong detergent can cause sudsing during the wash cycle. When this happens, the suds may rise above the level or be splashed over the door sill. It usually shows up as a drip and not as suds on the floor.
To diagnose, open the door during a wash cycle and look inside. A high level of suds will be obvious to you.
The solution is to change detergents. I highly recommend powdered Cascade™ detergent. See section 2-2, preventive maintenance.
To get through the cycle you've already started without spilling too much more water, try adding a couple of tablespoons of cooking oil to the wash cycle. The oil will knock down the suds, and the dishwasher will wash it out during the rinse cycle.
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