A dishwasher that leaves standing water at the bottom after a cycle often has a clogged drain hose. This hose carries wastewater from the dishwasher’s sump to the sink drain or garbage disposal. Over time, food debris, grease, glass shards, or mineral buildup can obstruct it.
Here is a comprehensive guide to diagnosing, clearing, and preventing a clogged dishwasher drain hose. How to Tell if Your Drain Hose is Clogged drain hose dishwasher clogged