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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242
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Verified Reviews for Dishwasher Installation pros in Sun Valley, CA

*The Angi rating for Dishwasher Installation companies in Sun Valley, 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 Sun Valley, 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 July 09, 2026

Reviewed in July 2026
Thought I needed a new pump in my dishwasher. Ricardo diagnosed the problem, and cleaned the filters which resolved the problem saving the cost of a new oump.
Lerman Appliances
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Reviewed in March 2026
I’m so grateful I found Lincoln Plumbers. They are clean, honest and reasonable.This crew has fixed anything I need done. They replaced my kitchen faucet. Then I had a clog/flood and they saved me. I’m going to have them install a new dishwasher. So many scammers out there but these people are...
LINCOLN INDUSTRIES
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Reviewed in December 2025
Excellent service from LA Best Appliance Repair! Our dishwasher was not draining properly, and they quickly diagnosed the issue and fixed it the same visit. The technician was professional, punctual, and very knowledgeable. Everything was explained clearly, and the repair was done efficiently...
LA BEST APPLIANCE SERVICES INC
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Reviewed in August 2025
We were not an easy fix. Nothing in our home was built with standard sizes. Randy, our plumber, purchased the correct size and completed the replacement of the hot water valve to the dishwasher in record time. He was kind, efficient and timely. We really appreciate him and his company.
Overland Plumbing
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Reviewed in September 2024
Very professional and timely service. Came onsite to view specific location and gave me an immediate competitive quote. Took them about 40 minutes to pick up new water heater and an hour to install. Very clean installation.
Dropstars Plumbing
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Reviewed in April 2023
One of the best installers that I know, great quality, and workmanship.
Arroyo's Tile & Granite Inc.
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Reviewed in December 2022
The technicians finished our dryer installation even though it wasn't part of the job.
Empire Energy Solution
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Reviewed in September 2022
Great serviceman On time Very neat Dishwasher works great Would use this company again
AML SERVICE
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Reviewed in September 2021
Called and came out quickly. Did the install in a few minutes. Price was very fair. Would recommend him highly and will call him again if I need anything else done.
First Thought Plumbing
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Reviewed in March 2021
They did clean installation. Their customer service and pricing are great.
Intelligent Surveillance Systems
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Dishwasher Installation questions, answered by experts

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.

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.

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

The Sun Valley, CA 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

Angi
•
Apr 6, 2026Apr 6, 2026
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