If you have nuisance water leaks around the base of your dishwasher, you may be using a detergent that is sudsing too much. Cut back on the amount of detergent you use, and see if that makes a difference.

Water that spills through the door vent is usually caused by improperly loading dishes. Leaks from the door itself may be caused by a faulty door gasket or door tightness adjustment.

Also make sure the dishwasher is sitting level (you can adjust the front feet up or down, and many units have some type of levelers at the rear).

Water under the dishwasher may be originating from a leaky hose or loose hose connection. Remove the lower front panel, and check the hoses. The pump seal may be defective, too; replacing this is a job for an appliance repairperson. An older dishwasher may corrode at the bottom, but this is fairly uncommon. If this is the case with your dishwasher, it's time for a new one.