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 Gardena, CA

*The Angi rating for Dishwasher Installation companies in Gardena, 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 Gardena, 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 May 2026
Wow! Best home improvement experience ever. We recently had a primary bath done; the product and installation were impeccable from Shugarman's Bath. No hassles. The sales rep was honest, knowledgeable, and a pleasure to work with. The company's paperwork was easy to understand. The...
Shugarman's Bath
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Reviewed in August 2022
Quality material and workmanship. During installation the installer paid strict attention to every detail of this project.
LeafFilter Gutter Protection
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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 - LA
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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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Reviewed in February 2020
Armando & his brother did an excellent job removing and old dishwasher, replacing the kitchen valves, installing a new, high end dishwasher and removing and repiping a below grade garden sprinkler valve box. Armando replaced the completely corroded under sink valves with double headed high end...
Armando's Rooter & Plumbing
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Dishwasher Installation questions, answered by experts

Water may linger at the bottom of your dishwasher if the cycle is interrupted or if there’s a clog in the system. Begin by pressing and holding the cancel button to ensure the cycle finishes. You may need to check the filter, hose, air gap, and garbage disposal for clogs if it still doesn't drain. If the problem persists and there is no visible clog, a professional will need to assess and fix the problem for you.

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.

Limescale can build up outside your dishwasher if you live in a home with hard tap water. Any household surface exposed to water and heat may have unsightly limescale deposits, including kettles for boiling water, sinks, countertops, toilets, taps, tubs, shower doors, glassware, and aquariums. Glass, laminate, porcelain, granite, and other similar surfaces can all have limescale.

Basic maintenance, such as cleaning filters, is DIY-friendly, but repairs involving electrical components, pumps, or valves should be handled by a professional.

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

The Gardena, 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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