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 Webster Groves, MO

*The Angi rating for Dishwasher Installation companies in Webster Groves, 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 Webster Groves, 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 September 25, 2025

Reviewed in September 2025
We were connected through our Home Warranty coverage. He came on time in service window, was completely professional, focused on the job and got it done. Dishwasher is now working! Very grateful.
Speed Service
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Reviewed in August 2025
Great job installing my dishwasher - Thank you!
Williams Handyman
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Reviewed in June 2025
I hired this pro because he was honest about how difficult it is to deal with cutting tile around faucets in these old houses. He recommended cutting a big portion so the tile could be repaired if it broke but I would need a tile person to come in and fill in the tile. When he heard it was my...
Parkers Plumbing, LLC
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Reviewed in October 2022
I was given an honest opinion that my dishwasher may be beyond repair. They tried a couple of different things with my consent but parts needed for 20 year old dishwasher were no longer available.
All American Appliance Service Inc
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Reviewed in July 2022
Our plumber was very conscientious, arrived well before the scheduled time and had to work very hard to remove the old dishwasher as several previous changes in the kitchen had affected the setting of the unit. The removal accounted for the greatest portion of the time & cost. The subsequent...
Bieg Plumbing & Mechanical
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Reviewed in February 2022
The whole process was easy and painless from ordering the door to having it installed. Highly recommend, will hire again.
Chaney Windows and Doors LLC
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Reviewed in March 2021
When our new dishwasher was delivered, the plumber informed us that our electric wasn't up to code so he couldn't install. Desperate for an electrician, we called Streib and they had someone to us within the hour. Carson was professional and wore a mask the whole time. We will definitely use...
Streib Company
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Reviewed in October 2020
My dishwasher was leaking. I called ASAP and talked directly to an appliance repair expert, not a receptionist. He was sure enough of the cause to order a part in advance, which saved me a diagnostic visit. This was completely opposite to another "prominent" appliance repair service in the area....
ASAP Appliance Repair Service LLC
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Reviewed in July 2020
I purchased a portable dishwasher. They not only price matched, they gave me a substantially better deal. Now because of the Covid pandemic, delivery was delayed slightly. This was not an issue as they communicated with me to let me know. The day of delivery, I was given a call ahead and the...
Slyman Bros Appliances
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Reviewed in May 2020
Changed out dishwasher in 30 minutes. Friendly service.
Affordable Appliance
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Dishwasher Installation questions, answered by experts

Maintenance includes regular filter cleaning, checking water connections, and ensuring that the unit operates at optimal efficiency without blockages.

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

The correct water temperature for your dishwasher depends on the washing phase. When water enters the machine, it should be around 120 degrees Fahrenheit, but no hotter than 150 degrees. During the wash cycle, the machine will heat the water to between 130 and 140 degrees. If your dishwasher has a sanitizing cycle, the water can reach a temperature of up to 180 degrees.

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.

The Webster Groves, MO 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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