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 Belton, MO

*The Angi rating for Dishwasher Installation companies in Belton, MO 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 Belton, MO 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 June 16, 2026

Reviewed in June 2026
Based on the recommendations, we elected to replace our dishwasher rather than repair
Able Appliance Repair
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Reviewed in August 2025
Very professional! Quick response time. Fixed dishwasher that was not pumping out water. Keeping Mason's number for any future appliance needs!
Appliance Wizardz
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Reviewed in January 2025
Installation was fine. Orkie came back and fixed a problem (unrelated to the installation) with the water heater during an evening.
Hot Water Biz
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Reviewed in October 2023
the customer service was very helpful, very courteous, and informative. install was quick and easy
Mr. Handyman of Lees Summit, Raymore and Grandview
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Reviewed in September 2023
Used this company based on reviews for dishwasher water damage to ceiling in finished lower level. Impressed to get a quote before the estimater/owner left my driveway. Showed up on time, meticulously plastic and paper wrapped my area, patched a 15' hole/rectangle cut out by water...
J III Enterprises, Inc.
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Reviewed in June 2023
Branson came on time and diagnosed the issue with my dishwasher quickly. He wrote up separate quotes for both repair and replacement (to get reimbursed from the home warranty company)
N L Electric & Appliance Services
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Reviewed in December 2022
The installation was great. Cleaned up very well. Love my new patio door
Leone Remodeling
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Reviewed in March 2022
Very well - Joe arrived early, advised oversaw some of my DIY prep for dishwasher, added new shutoff values I requested, was very courteous and efficient. Good experience.
JOE LILLIS PLUMBING
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Reviewed in January 2022
The installers are very conscientious.
Ditgen Multi-Services
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Reviewed in January 2022
Gary was very professional and knowledgeable. He installed my hot water heater and removed the old one. He helped me select the new one and picked it up along with the parts needed for installation. I would use him for future projects.
Gary Gorski
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Dishwasher Installation questions, answered by experts

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

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.

Yes, you can use vinegar to unclog a dishwasher. To do so, combine 4 tablespoons of white vinegar with 4 tablespoons of baking soda and pour the mixture down your dishwasher’s drain. Let it sit for 15 minutes, then pour a cup of hot water down the drain to flush everything out. Finally, run a rinse cycle on your dishwasher to see if the clog is gone.

A dishwasher can help save you significant time when it comes to getting your dishes clean. It can also get your dishes more hygienically clean than washing by hand due to higher water temperatures and specialized detergents, effectively sanitizing them and reducing the risk of foodborne illnesses. Compared to hand-washing, a dishwasher typically uses less water and energy to clean the same amount of dishes, making it a more resource-efficient option.

The Belton, MO 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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