Why does a dishwasher have to drain through the sink plumbing?

• <div><p>Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.</p></div>

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Verified Reviews for Dishwasher Installation pros in Galloway, OH

*The Angi rating for Dishwasher Installation companies in Galloway, OH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

*The HomeAdvisor rating for Dishwasher Installation companies in Galloway, OH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

Last update on November 14, 2025

Reviewed in November 2025
The installer did flawless work and cleaned up well. I did have to contact them several times about setting a schedule after being told I would hear within 5 business days.
Footprints Floors of Columbus
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Reviewed in September 2024
As soon as Lowe's received our dishwasher at the local store, Bennett Home Services called to arrange installation. Stephanie was very flexible in adjusting to our availability. The installer was the most professional technician I've ever had. He adjusted the machine to exactly fit the space and...
Bennett Home Services
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Reviewed in October 2023
Was contacted within minutes of requesting a quote. They had same day availability, and had a technician out in about 2 hours. The technician was fast, professional, reasonably priced, and efficient. The tech was able to diagnose and fix our dishwasher in about an hour.
Albra Services LLC
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Reviewed in June 2023
Dave was up front and honest from the initial phone call to the time spent evaluating our issue with our dishwasher. He was very knowledgeable and didn't try to sell us a repair when a replacement made more sense. We would definitely use him again!
Handy Appliance Repair
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Reviewed in November 2022
The process was good from start to finish. The installer knew his stuff.
EasyBath, Inc.
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Reviewed in June 2022
Jim installed a new dishwasher. He was very accommodating in setting up the day and time to fit my schedule. He picked up the appliance at the hardware store and arrived at my house as scheduled. The installation only took a short time and he checked to make sure it was working correctly. I...
Jim's Home Repair
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Reviewed in February 2022
They called ahead and arrived at time agreed. Identified the problems and quoted those repairs , helped find a reasonable cost replacement for this dishwasher.
In & Out Appliance Service
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Reviewed in December 2021
The installation took two days and went very well
Logan Services A/C, Heat & Plumbing
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Reviewed in December 2021
They were able to do the install the same day I called. My opener broke at 7:00 am, and the new one was installed by noon! Great customer service.
Apex Garage Door Services
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Reviewed in November 2021
Good experience except for the value delivered and billing. Bosch dishwasher was reporting an error on drain (code E:24). The unit is out of warranty. First technician came to house and diagnosed that the drain cover needed to be replaced. Part was "backordered" one week (odd for a certified...
The Applianceman Service
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Dishwasher Installation questions, answered by experts

Common issues include drainage problems, faulty doors, inconsistent cleaning performance, unresponsive controls, or unusual noises.

Your dishwasher drains through a hose that attaches to the plumbing below your sink or snakes out the back of your machine. In most cases, you can access one side of the hose from below your sink, as it usually ties into the same drainline that your sink uses. Otherwise, you may need to pull the dishwasher out of the counter to access it.

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

Repair costs vary by issue, typically from $100 to $500, depending on the parts needed and labor involved.

Only if the dishwasher isn’t made of stainless steel. The corrosive chemicals in bleach will stain stainless steel and can also cause further damage. To stay on the safe side, stick with an extra cycle of vinegar to banish any lingering odors.

The Galloway, OH homeowners’ guide to dishwasher installation services

From average costs to expert advice, get all the answers you need to get your job done.

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