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 Andover, MN

*The Angi rating for Dishwasher Installation companies in Andover, MN 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 Andover, MN 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 March 15, 2026

Reviewed in March 2026
Installed a dishwasher. One snag, but it was addressed and everything worked out great.
Lee's Remodeling
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Reviewed in August 2025
The installers communicated well, showed up on time, and did an excellent job installing a glass shower door provided by us. They also took away all the refuse left from the installation. We recommend them highly and would use them again.
BP Glass & Mirror
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Reviewed in June 2023
Installer did a good job - only took a few hours and cleaned up very well after he was done.
LeafFilter Gutter Protection
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Reviewed in December 2022
They came out do take a look at my dishwasher
Becker's Appliance Repair
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Reviewed in September 2022
They installed a new water heater for us and removed the old one. The installer was very professional, quick, and clean. Great job!
Water Heaters Now, Inc.
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Reviewed in May 2021
They removed an old stove and dishwasher in a matter of a few hours after submitting a request for my project. Very satisfied with their quick response time and getting the job done fast. Highly recommend and would hire again.
Wright & Moore Contractors
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Reviewed in January 2021
Installers did a very good job.
Empire Today - Minneapolis
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Reviewed in October 2020
I had already pulled dishwasher from enclosure so was easy to get too. After 20 minutes of trying to find leak, and after a phone call to main shop, I was informed that there was a hole in the bottom of the tub and unrepairable. I was asked how old the dishwasher was. Unfortunately, a new...
Andersons Mechanical Service LLC
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Reviewed in September 2020
I called Hansen's and the phone was immediately answered by the owner, Troy. (How refreshing to actually talk to a live person.) He was very friendly and listened to the project we were considering. He explained how the process would work and scheduled one of his employees to measure. After our...
Hansen's Custom Countertop Services Inc
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Reviewed in January 2020
Handyman Dan gave me a bid for well over 20 misc. paint spots in my house. He fixed our off center doors and the dishwasher. There is no job handyman Dan can not do. We will be using him again for many other projects.
HandyDan Handyman, LLC
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Dishwasher Installation questions, answered by experts

DIY installation or repair is possible with the right skills and tools, but if not done correctly, it can often lead to water leaks or improper connections.

A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters.

Costs depend on labor rates, replacement part prices, brand, and whether emergency service is required.

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.

Repairs typically cost between $150 and $600, depending on the issue, parts needed, and labor charges.

The Andover, MN homeowners’ guide to dishwasher installation services

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

See all articles

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