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 Osseo, MN

*The Angi rating for Dishwasher Installation companies in Osseo, 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 Osseo, 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 May 2025
He spent alot of time troubleshooting the problem. When he found it, the damaged hose was no longer in stock anywhere as the dishwasher was so old. He then spent alot of time and found a generic hose that did work. He wanted to get the project done quickly. He cleaned up qell. Price reasonable....
J. Appliance Repair
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Reviewed in April 2025
We hired him to install a new kitchen faucet and complete a couple other repairs (repair a bathroom sink stopper and a patio door latch).
Handyman Connection of Eden Prairie
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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 June 2021
Eric's company did a renovation in our kitchen and living room last year. This week we had an issue with the dishwasher that disconnected from the granite. I emailed Eric - and he came right out to fix it. I really appreciate companies that stand by their warranty and are so customer service...
Swencraft
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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 March 2021
I had already established most of the problem, that the dishwasher was not filling properly. When I talked with Sergio, he said that it was probably the intake valve. He took the dishwasher model number and looked up the valve, gave me a parts & labor estimate on the spot, and we set up an...
Appliance Repair MPLS
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Reviewed in January 2021
Installers did a very good job.
Empire Today - Minneapolis
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Reviewed in December 2020
Extremely quick response from Joe (had called a few other places, no one could come look at repair in less than three days, some out ten days). After talking to him on the phone, he confirmed what we believed the problem most likely was, a bad control panel, which is a costly repair. We're...
Hometech Appliance Repair LLC
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Dishwasher Installation questions, answered by experts

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.

Yes, vinegar is an excellent homemade solution to clean a dishwasher. Its acidity will cut through any buildup, while its natural deodorizing capabilities will take care of any nasty smells.

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

You can repair minor damage to a dishwasher drain hose with tape designed to handle moisture but it’s probably better to simply replace it. Dishwasher hoses are inexpensive items that, although they require some muscle to change, are best swapped out. You don’t want to find your kitchen has flooded because of a faulty part that usually costs between $10 and $30.

Limescale can build up outside your dishwasher if you live in a home with hard tap water. Any household surface exposed to water and heat may have unsightly limescale deposits, including kettles for boiling water, sinks, countertops, toilets, taps, tubs, shower doors, glassware, and aquariums. Glass, laminate, porcelain, granite, and other similar surfaces can all have limescale.

The Osseo, MN 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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Angi
•
Apr 6, 2026Apr 6, 2026
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Understanding the different parts of a dishwasher can help you troubleshoot any issues and know when to call in the professionals.