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 Dulles, VA

*The Angi rating for Dishwasher Installation companies in Dulles, VA 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 Dulles, VA 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 20, 2026

Reviewed in March 2026
Technician has phenomenally quick response; came out same day of the call. Diagnosed the failure of my GE dishwasher’s motherboard. Efficient and explanatory with information. Courteous and clean in his process. Cost was commensurate with the repair. I would definitely recommend Sun Home Service.
Sun Home Service, LLC
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Reviewed in December 2024
Jawid responded to our request for an estimate quickly and thoroughly discussed our options to repair or replace our dishwasher. He was able to install our new one the day after it arrived. Thank you!
Major Appliances Repair, LLC
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Reviewed in December 2024
Mega Plumbing Chantilly, Va. (Brian & Pedro) did a great job installing my new dishwasher. They quickly and carefully removed the old dishwasher and quickly and carefully installed and tested the new dishwasher. They made sure everything was done properly and the unit was level and operating...
Mega Plumbing Corp.
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Reviewed in May 2024
Nazer was super professional and cost efficient for my dishwasher repair.
Angi Pro
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Reviewed in April 2024
The best folks I’ve ever dealt with. Sales, service , delivery and installation all excellent. The installer Rafael Gomez was amazing he went above and beyond with the installation. Placing extra supports by using 2x4s to make sure the dishwasher fit perfectly.
Sterling Appliance
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Reviewed in January 2024
Suki was hired to install a dishwasher. He installed it and hauled away the old one. On the job he found a plumbing issue which he was able to resolve as well. He came in on short notice and did a thorough job.
Gravity Remodel
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Reviewed in August 2023
Happy with the job that the Tech did to replace our dishwasher. He also spotted a related issue on stop valve and offered to fix it for a nominal and reasonable cost.
Q & A Appliance Repair LLC
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Reviewed in July 2023
Had another plumber come in to fix leaking dishwasher supply. Charged 2.5 hours and still leaks. Called Stinson and Daniel and Matt were here within 1 hour of my call and fixed within 30 minutes. Great response and repair.
Stinson Plumbing, LLC
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Reviewed in June 2022
Andrew and Christian completed our install. All done and cleaned up in one day. Polite and courteous, on time arrival and tidy! Highly recommend this install team!!
Mister Window
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Reviewed in March 2022
Tarek was first to respond while others took time. He is punctual. Well Mannered. He could diagnose the problem quickly. He explained the problem and charges. His charges were competitive. Had to wait couple of days for him to get the non-stock parts but it was within a week. He came back and...
Pro Service Appliance Repair
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Dishwasher Installation questions, answered by experts

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.

How long it takes to remove a dishwasher depends on how quickly you can work and the positioning of the appliance. In most cases, you can expect to remove a dishwasher in one to two hours. If the connections are older, you’ll need to use a bit more elbow grease to loosen them. This can make the process a bit longer.

The drain pump will naturally make a standard operational and draining sound several times throughout your dishwasher cycle. If you hear abnormally loud sounds like scraping, grinding, or clicking, you may have food debris or a piece of glass stuck in your drain filter. Avoid dishwasher repair by always scraping food off your dishes and loading the racks correctly.

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.

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.

The Dulles, VA 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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