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 Angier, NC

*The Angi rating for Dishwasher Installation companies in Angier, NC 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 Angier, NC 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 January 22, 2026

Reviewed in January 2026
This is the second time that I have worked with Edward. He is responsive, knowledgeable, and efficient. My dishwasher wouldn't use all of the soap, so there was constant residue in the machine, on the dishes, and food remained on the items. He provided me details as to why there was an issue and...
Rovex Appliance Repair
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Reviewed in September 2025
Eddie was quick and friendly, got our new dishwasher installed right away with no issues.
E Wright Appliance Repair
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Reviewed in March 2024
Installer David was quick and efficient. Punctual and friendly.
Tip Top Garage Doors, LLC
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Reviewed in August 2023
On time , clean install, will hire again.
J-Worx Plumbing
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Reviewed in May 2023
Ryan E. and Anthony W. were very professional, polite and very knowledgeable about the shower installation. They cleaned up and you would not have known they had installed anything.
West Shore Home Raleigh-Durham
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Reviewed in April 2022
I worked with the service tech will who was really nice, explained the issues with my dishwasher, and was helpful with advise for the future so I m not having consistent breakdowns.
Universal Appliance Repairs
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Reviewed in October 2021
Went well, repaired dishwasher door. Good communication, reliable!
Saun, LLC
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Reviewed in May 2021
Carl and Ralph are the best to work with. Honest, understanding, and will work with you. due to Covid my budget was limited, but Carl and Ralph understood and helped me get what I desired and under my budget! My kitchen had the cabinets repainted and new hardware, new backsplash, new...
Triangle Classic Homes Inc
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Reviewed in August 2020
Daniel did a great job! He is knowledgeable, cleans work area and is a very nice man. Daniel took extra steps to make sure my dishwasher was installed correctly. He even broke down the box and discarded it. Excellent customer service! Daniel will be returning to my home to install timers for...
Daniel Mariscal
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Reviewed in July 2020
Mike is a very experienced contractor who is easy to work with and who knows how to get the job done. the dishwasher install was rather complex but Mike managed it very well. I recommend Mike for any job he feels capable of doing.
On Time Services
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Dishwasher Installation questions, answered by experts

Leaks, poor drainage, failure to start, water not heating, and excessive noise frequently require service.

A dishwasher filter should be replaced every five years, depending on the manufacturer's recommendations and the frequency of use. The exact timing can vary based on factors such as the hardness of your water, how well you rinse dishes before loading them, and how often you clean the filter. Regularly inspect the filter for signs of wear and tear or damage. If the filter appears worn out, damaged, or excessively clogged despite regular cleaning, it should be replaced sooner.

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

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.

Installation includes leveling the unit, connecting water and electrical lines, securing the unit, and testing for function and leaks.

The Angier, NC 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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