Opening your dishwasher after a cycle and finding standing water at the bottom can be frustrating—and concerning. Many homeowners wonder: Is it normal for a dishwasher to retain some water? Or does it signal a problem? The answer depends on the amount of water, how frequently it occurs, and other signs the appliance might be giving off.
A Small Amount of Water Is Sometimes Normal
A very small puddle of water (around a tablespoon or two) left behind near the filter after a cycle can actually be normal. This is usually there to keep the pump seals moist and prevent them from drying out or cracking. If your dishes are clean, and the machine isn’t giving off any unusual odors or sounds, a small amount of residual water shouldn’t be cause for concern.When Standing Water Indicates a Problem
However, if you notice a large pool of water—especially if it covers the bottom of the tub or is deep enough to reach the lower spray arm—then something isn’t working as it should. Here are the most common culprits:1. Clogged Filter
Over time, food particles and debris can build up in the dishwasher’s filter, which is designed to trap large particles. A clogged filter can block proper drainage, leaving dirty water behind. Cleaning the filter regularly (every 1-2 months) can help prevent this issue.2. Blocked or Kinked Drain Hose
The drain hose connects the dishwasher to your sink’s plumbing. If it’s kinked, clogged, or not installed correctly, water may not drain completely. Inspect the hose for bends or clogs, and ensure it’s mounted with a proper high loop or air gap to prevent backflow.3. Garbage Disposal Connection
If your dishwasher drains into a garbage disposal, make sure the knockout plug has been removed (especially after a new disposal installation). Also, a clogged or full disposal can prevent the dishwasher from draining properly.4. Faulty Drain Pump
The drain pump actively removes water from the unit at the end of the cycle. If the pump is failing or blocked by debris, it might not remove water effectively. Listen for odd sounds during the draining phase; a humming noise may indicate a jammed or broken pump.5. Air Gap Blockage
In homes equipped with an air gap (typically found on the sink), any blockage here can lead to drainage problems. Remove the cap and check for buildup that might be restricting water flow.6. Float Switch Malfunction
The float switch monitors water levels and prevents the dishwasher from overfilling. If it’s stuck or defective, the machine might not drain at the appropriate time, leading to leftover water.Preventive Maintenance Tips
To reduce the chances of drainage problems:- Clean the filter monthly.
- Run hot water in the sink before starting the dishwasher to help improve wash and drain performance.
- Use dishwasher-safe rinse aids and avoid excess detergent.
- Occasionally run a cycle with vinegar to clear out mineral buildup and odors.
- Make sure dishes are properly scraped before loading.