Across 2,527 real dishwasher repairs in the SF Bay Area & Peninsula ($593,025 in booked work), "it won't drain" is one of the two problems we get called for most. We've handled 532 not-draining jobs specifically the kind where you open the door after a cycle and there's a pool of dirty water sitting in the bottom that just won't go away.
The good news: standing water almost always traces back to one of a handful of parts, and most of them are a same-day fix. Below is what our techs actually find when they open these units up, what the repair usually involves, and how to tell a quick DIY unclog from a job that needs a pro.
What our customers tell us:
"The dishwasher is not draining and collects standing water. I've manually drained it, cleaned the accessible filter, and ran the disposal but it has not improved."
"It no longer drains the water after the cycle finishes. The filter is clean and has been checked, so maybe it's the pump or the drain hose?"
If that sounds like your kitchen, you're in the right place and no, you're not doing anything wrong. Once the easy stuff is ruled out, standing water is a mechanical problem, not a user error.
Common causes we actually see
When a dishwasher holds standing water, here's what our techs find in the field, roughly in order of how often it's the culprit:
- Clogged filter, sump, or check valve. Food debris, glass grit, and grease build up in the sump basin and the one-way check valve that keeps drained water from flowing back. This is the most common cause and often the cheapest fix.
- Failed or jammed drain pump. The small motor that pushes water out the drain hose. It can seize on a shard of glass, a fruit pit, or a twist-tie, or the motor simply burns out.
- Kinked, clogged, or improperly looped drain hose. The hose that runs from the dishwasher up to the disposal or air gap under the sink. A missing high loop is a classic reason water siphons back in.
- Garbage disposal knockout plug still in place. If your dishwasher was recently connected to a new disposal, a plastic plug may never have been punched out so the water has nowhere to go.
- Clogged air gap or disposal inlet. The little chrome cylinder on the countertop, or the disposal port itself, packed with sludge.
- Control or drain-valve fault. Less common, but the board or drain solenoid can fail to trigger the pump at the right point in the cycle.
Many of these show up alongside an error code (we've cleared 516 error-code jobs on dishwashers), which is your machine telling you it tried to drain and couldn't.
The usual fix
Most not-draining repairs follow the same path. Our tech will:
- Confirm and remove the standing water so the sump can be inspected.
- Pull and clean the filter, sump, and check valve clearing the obstruction outright resolves a real share of these calls.
- Test the drain pump for continuity and for physical blockage. A seized or dead pump gets replaced.
- Check the drain hose, high loop, air gap, and disposal knockout for kinks, clogs, or a plug that was never removed.
- Run a full drain cycle to verify the water leaves cleanly and doesn't siphon back.
Most of these are completed in a single visit because we stock the common drain pumps and hoses for the brands we see most (Bosch, GE, Whirlpool, Frigidaire, Samsung, KitchenAid). The dishwasher parts we replace most often across all these jobs are 631200 / 00631200 and WD15X10014, so we keep them on the truck.
Honest DIY vs. call a pro
Worth trying yourself first (10 minutes, no tools):
- Run your garbage disposal food from the disposal side can back up into a shared drain line.
- Remove and rinse the filter at the bottom of the tub, then clear any visible gunk from the sump.
- Check the drain hose under the sink for an obvious kink, and make sure the air gap on the counter isn't clogged.
- Run a short cycle and see if it drains.
Time to call a pro if:
- The filter is already clean and it still won't drain (one of the most common things our customers tell us, and it points past the easy fixes).
- You hear the pump humming, buzzing, or gurgling but no water moves usually a jammed or failing drain pump.
- Water siphons back in after you manually bail it out.
- There's a flashing error code tied to draining.
We don't recommend homeowners open the pump housing or drop the machine to reach the drain solenoid there's standing water, wiring, and glass shards involved, and it's easy to crack a seal and turn a drain problem into a leak.
What it costs in the Bay Area
Our median dishwasher repair runs about $250, parts and labor included. A simple clog clear sits at the low end; a full drain-pump replacement lands higher depending on brand and part cost. We charge a diagnostic fee that we credit toward the repair when you approve the work so the diagnosis effectively becomes free once you move forward. You get a firm quote before any parts go in, no surprises.
Book same-day dishwasher drain repair
We cover the SF Bay Area & Peninsula with same-day and next-day appointments. If you've got standing water sitting in the bottom right now, call and we'll get a tech out to diagnose it fast.
Call (888) 993-5699 or book online for same-day service.
Related pages
- Dishwasher Repair in the SF Bay Area & Peninsula our full dishwasher service hub
- Dishwasher Leaking Water From the Bottom or Front if you're seeing water on the floor, not just in the tub
- Dishwasher Won't Turn On or Start a Cycle for a unit that won't power up
- Bosch Dishwasher E24 Error (Won't Drain) the drain error we see most often
- Bosch Dishwasher Won't Drain Bosch-specific drain repair
- Dishwasher Repair in San Mateo Peninsula service area
Frequently asked questions
Why is there standing water in the bottom of my dishwasher after a cycle? The machine ran but couldn't push the wash water out. The usual causes are a clogged filter or check valve, a jammed or failed drain pump, a kinked or clogged drain hose, or a garbage-disposal knockout plug that was never removed. We find one of these on the large majority of the 532 not-draining jobs we've completed.
My filter is clean but the dishwasher still won't drain what else could it be? This is one of the most common things our customers tell us. Once the filter and sump are clear, the problem is almost always downstream: a seized or burned-out drain pump, a clogged drain hose or air gap, or a failed drain valve. These need a meter and a look inside the pump housing to confirm.
Can I fix a dishwasher that won't drain myself? Sometimes. Run the garbage disposal, clean the filter, and check the drain hose under the sink for a kink those clear the easy clogs. If it still holds water, or if the pump hums without moving water, it's time for a tech. We don't recommend opening the pump or dropping the machine yourself.
Is standing water in the dishwasher an emergency? Not usually, but don't let it sit for days standing water grows bacteria and odor, and a failing pump left running can overheat. Bail it out, leave the door cracked, and get it looked at within a day or two.
How much does it cost to fix a dishwasher that won't drain in the Bay Area? Our median dishwasher repair is about $250 including parts and labor. A simple clog clear is at the low end; a drain-pump replacement is higher depending on brand. We charge a diagnostic fee that's credited toward the repair once you approve the work, and you get a firm quote before we start.
Do you offer same-day dishwasher drain repair on the Peninsula? Yes. We serve the SF Bay Area and Peninsula with same-day and next-day appointments and stock the common drain pumps and hoses for the brands we see most. Call (888) 993-5699 to book.