Why does my dishwasher leave water in the bottom?

Water pooling in the bottom of your dishwasher is typically caused by a clogged drain, blocked garbage disposal, or faulty drain pump. This standing water can lead to odors and poor cleaning performance if not addressed promptly.

The most common culprit is food debris blocking the dishwasher's drain system. Check the bottom of your dishwasher for the cylindrical filter (usually located beneath the bottom spray arm) and remove any visible food particles, grease, or debris. Many homeowners don't realize this filter needs regular cleaning every few weeks. Also inspect the drain hose connection under your sink - if it connects to a garbage disposal, run the disposal to clear any blockages there.

Mechanical issues can also cause drainage problems. The drain pump may be failing, or the drain hose could be kinked or clogged where it connects to your home's plumbing system. In Ottawa homes, we often see drain hoses that have developed kinks behind the dishwasher or have become disconnected from the garbage disposal or sink drain.

Before calling a plumber, try these steps: clean the filter thoroughly, run your garbage disposal if connected, and check that the drain hose isn't kinked. If water still remains after these checks, you likely need professional diagnosis. The issue could be a failing drain pump ($300-500 to replace) or a more complex drainage problem requiring plumbing expertise.

Persistent standing water can damage your dishwasher and create unsanitary conditions. If basic cleaning doesn't resolve the issue, it's time for professional assessment to prevent costly water damage to your kitchen flooring.