Standing water at the bottom of your dishwasher is one of those problems that looks scary and usually isn't. Four components handle drainage. They fail in a predictable pattern. Check them in order and you'll know exactly what you're dealing with — and what to tell a tech if you need one.
1. The Filter (Start Here, Every Time)
The filter sits at the base of the tub, usually a twist-out cylinder. Its job is to catch food debris before it reaches the pump. When it's clogged, water has nowhere to go.
This is the cause in roughly half of all non-draining calls. It requires zero tools and five minutes.
Twist it out. Rinse it under the sink. Look for compacted food, grease buildup, or anything restricting the mesh. Reassemble. Run a short cycle. If water drains — you're done.
If it doesn't, move on.
2. The Drain Hose
The drain hose runs from the pump to either your sink drain or your garbage disposal. It can fail in two ways.
Kinked. Pull the dishwasher forward slightly and look at where the hose runs under the counter. A sharp bend cuts off flow completely. Straighten it and the problem is solved.
Clogged. Grease and debris pack into the hose over time. Disconnect it at the sink end, have a towel ready, and run water through it to check for blockage. A clear hose flows freely. Anything less — clean or replace it.
Drain hose issues account for another 20–30% of calls. Combined with the filter, you've now covered 80% of cases before touching anything mechanical.
3. The Garbage Disposal Connection
If your dishwasher drains into a garbage disposal, this one trips people up.
New disposal installed recently? There's a knockout plug in the dishwasher inlet port that must be removed during installation. If it wasn't, drainage is completely blocked — and there's nothing wrong with the dishwasher itself.
Even on older setups, the disposal inlet can accumulate grease. Run the disposal for 30 seconds before you start a dishwasher cycle. If the inlet is clogged, water backs up into the tub.
Quick check. High payoff if it applies to your setup.
4. The Drain Pump
If the first three checks come up clean, you're looking at the drain pump. This is the 20%.
The drain pump forces water out of the tub and through the hose. It fails in two ways: a physical obstruction jamming the impeller, or a motor worn out past the point of producing enough pressure.
Obstruction — sometimes fixable at home. Access the pump housing, look for debris on the impeller, clear it. A piece of glass, a small bone fragment, a chunk of label. This works more often than people expect.
Failed motor — this is a parts call. The pump assembly needs replacement. On most mainstream brands — LG, Whirlpool, Bosch, GE — the pump is a standard stocked item. One visit. On Miele or Thermador, lead time varies, so it's worth confirming before the tech arrives.
What to Tell a Tech
If you've worked through the list and suspect the pump, say so when you call. A tech who knows in advance can confirm which pump assembly fits your model number and bring it stocked. That's the difference between one visit and two.
Your model number is on a label inside the door frame. Have it ready before you call.
Standing water isn't the dishwasher giving up. It's one part doing its job wrong. Most of the time, it's a filter that needs five minutes of your attention. The rest is a hose, a disposal connection, or a pump — all fixable in a single visit.
Work the list. You'll know where you stand.