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 Torrance, CA

*The Angi rating for Dishwasher Installation companies in Torrance, CA 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 Torrance, CA 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 17, 2026

Reviewed in June 2026
Armen and Rafi came and did some great repair and installment work today. I needed my dishwasher and a door lock changed out and they were able to get both done in a timely manner. I highly recommend booking with them and I will be sure to work with them again in the future. Thanks guys:)
Appliance Installation Repair Services INC
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Reviewed in November 2025
Fixed old dryer. Great service. Technician was prompt, kept us informed at every step, took the time to thoroughly test, clean, explain what led to and the fix for the issue. He explained how to care for the machine and what to expect. Very reasonable price. And he inspected an old dishwasher to...
Major Appliance Repair CA Corp.
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Reviewed in July 2024
Did a good job on the installation in one hour.
Drain City Plumbing, Inc.
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Reviewed in March 2022
Eric was awesome! He was very professional and informative. I called him freaking out because I was having issues with my dishwasher, the floor was getting hot where the dishwasher was. He came out and looked and gave me a couple of options and I decided to have my home repiped. Eric was very...
E&E Plumbing Pros-Unlicensed Contractor
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Reviewed in February 2022
The installers were knowlegable and courteous.
SoCal Climate Control - Bakersfield
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Reviewed in January 2022
Tyler was an expert in installing the water filtration system.
Pier Water Solutions LLC
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Reviewed in November 2021
INSTALLER WAS VERY PROFESSIONAL AND EXPLAINED WHAT WAS BEING DONE AND WAS VERY FRENDLY.
1st Choice Water Solutions LLC
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Reviewed in October 2021
David was involved in our kitchen, house-wide flooring and bathroom project. Couldn't be happier with the results and really impressed with how he handled the bumps (replaced a wrong sized cabinet without question and dealt with supply chain issues that delayed the dishwasher installation)...
Top Leader Construction, Inc.
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Dishwasher Installation questions, answered by experts

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.

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

The cost to repair a dishwasher depends on the type and scope of the problem. Replacing a heating element typically costs between $150 and $250 , for example. Depending on the age of your dishwasher and the extent of the problem, replacing the machine may be the more cost-effective option.

When a dishwasher discharges its wastewater, it uses a pump to quickly move a lot of water. If anything in the drain line or the garbage disposal impedes the high volume of water, it will back up into the sink through the drain or the garbage disposal. Following regular dishwasher maintenance tips like clearing clogs, keeping them cleared, and occasionally running the disposal will eliminate the problem.

The Torrance, CA 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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