What should I do if water remains in the bottom of the dishwasher after the cycle?

A small amount of remaining water is normal. However, if there is more than normal, check if the cycle has completed and if the drain air gap is clogged. Some plumbing codes require a drain air gap between the undercounter dishwasher and the drain system to prevent water from backing up into the dishwasher due to a plugged drain, and it should be kept clean to ensure proper draining.