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>

Best dishwasher installation pros near Dunn Loring, VA

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Verified Reviews for Dishwasher Installation pros in Dunn Loring, VA

*The Angi rating for Dishwasher Installation companies in Dunn Loring, 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 Dunn Loring, 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 06, 2025

Reviewed in March 2025
Repairman came to fix dishwasher due to no water coming in. He fixed the water valve and replaced copper hose with newer hose. Everything working well.
Major Appliances Repair, LLC
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Reviewed in October 2023
Fantastic experience. He walked us through the issues with our dishwasher, spent a couple of hours troubleshooting, and then gave us recommendations. High marks for professionalism and integrity. Highly recommended.
A.G.B Appliance Repair
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Reviewed in November 2022
Contractor did an excellent job and completed the installation on time.
Service Flooring
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Reviewed in January 2021
Offered a free on-site diagnosis and confirmed/identified a number of issues my dishwasher was exhibiting (some obvious, some not). I appreciated his analysis and given the cost of the dishwasher, he advised that I replace it. He was not angling for any follow-up service just an honest...
City Home Appliances & Services, LLC
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Reviewed in December 2020
Great service and install of a new dishwasher. Called on Tuesday and they were able to fit my install into their schedule the next day! Showed up exactly when they said they would and preformed flawless work. A++
American Appliance Repair Inc.
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Reviewed in November 2020
He has done multiple projects for me. Handyman, installing a dishwasher enlarging the space. They he remodeled the entire kitchen. Including the floor, cabinets, new appliances. He actually made a laminate countertop for me, in a specific color.
Tom General Contractor
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Reviewed in October 2020
They came right away for our broken Dishwasher. Communication was great. Results were good. The tech was thoughtful and the price was good. Overall great company. Will use them for all appliance repairs! Thank you.
Above The Rest Appliance Repair
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Reviewed in September 2020
The technician was knowledgeable and professional. He identified the leaking hose, and not only replaced it, but stabilized the dishwasher, so that it would not press against the hose.
DMV Appliance Repair Services LLC
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Reviewed in August 2020
Ice maker repair and diagnosis of leaking dishwasher
All American Appliance Service Inc
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Reviewed in June 2020
They showed up on time and diagnosed the problem but the part plus labor was close to a 1/3 of replacing a six year old dishwasher. So, I bought a new one.
Nova Appliance Repair
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Top-Rated Dishwasher installation pros in Dunn Loring - Updated Nov 2026

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Dishwasher Installation FAQs, answered by experts

To extend the lifespan, clean filters regularly, run cleaning cycles with vinegar, avoid overloading, and check for leaks.

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.

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

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

The Dunn Loring, VA 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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