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 Seneca, IL

*The Angi rating for Dishwasher Installation companies in Seneca, IL 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 Seneca, IL 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 April 14, 2025

Reviewed in April 2025
Frankie was very responsive, friendly and professional. He repaired the dishwasher and his charge was reasonable. I would recommend his services
Appliance Techs, Inc.
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Reviewed in July 2024
Showed up to install a new water heater same day. I was very happy with my experience. Tim was able to answer all my questions and the project was done very quickly. Excellent service very knowledgeable and professional. I completely recommend Grundy Plumbing.
GRUNDY PLUMBING, LLC
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Reviewed in October 2023
The installers were very professional in their approach to the project.
R L Lyon Heating & AC
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Reviewed in June 2023
Installers were so polite and friendly. Super fast, job done very well. Would hire again for reno.
Bath Planet of Peoria
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Reviewed in May 2023
My house has settled over the years and it became increasingly difficult to throw the deadbolt on the garage door leading into my backyard. Also the 50+ year old single pane sidelights of my front and back doors caused cold spots every winter and I was using narrow shades all summer to block the...
Illinois Energy Windows & Siding Inc
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Reviewed in May 2023
My house has settled over the years and it became increasingly difficult to throw the deadbolt on the garage door leading into my backyard. Also the 50+ year old single pane sidelights of my front and back doors caused cold spots every winter and I was using narrow shades all summer to block the...
Illinois Energy Windows & Siding, Inc.
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Reviewed in April 2022
Thrilled at the finished product. Old tub removed and new walk-in shower installed in one day. Great installers to work with and a spotless cleanup.
Bath Planet of Buffalo
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Reviewed in February 2022
I really appreciated the great communication in scheduling the install. The work was done with care and professionally. I would use them again.
Cleve Carpentry
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Reviewed in January 2022
Brian installed three doors for me did awesome job and took his time clean up after explaining what been done before after IÃ¢Â Â m very please
Lavalle Construction
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Reviewed in October 2020
The installer was great. He removed the old shower/tub combo. Had the water off and back on within a few hours. He cleaned up the mess quite nicely. The installer and install were great. Thanks
Bath Fitter
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Dishwasher Installation questions, answered by experts

Costs depend on labor rates, replacement part prices, brand, and whether emergency service is required.

Only if the dishwasher isn’t made of stainless steel. The corrosive chemicals in bleach will stain stainless steel and can also cause further damage. To stay on the safe side, stick with an extra cycle of vinegar to banish any lingering odors.

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.

Professional services ensure correct installation, verify water-tight seals, and safely address plumbing and electrical connections in dishwashers.

You can repair minor damage to a dishwasher drain hose with tape designed to handle moisture but it’s probably better to simply replace it. Dishwasher hoses are inexpensive items that, although they require some muscle to change, are best swapped out. You don’t want to find your kitchen has flooded because of a faulty part that usually costs between $10 and $30.

The Seneca, IL 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
How Much Does Dishwasher Installation Cost? [2026 Data]
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How Much Does a Dishwasher Cost?
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How to Install or Replace a Dishwasher
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Who Do You Hire to Install a Dishwasher?
Before upgrading to a new dishwasher, you need to know who to hire to install the dishwasher, as your choice can impact its efficiency and safety.
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Jul 9, 2026Jul 9, 2026
5 Types of Dishwashers and How to Choose One For Your Home
Overwhelmed with dishwasher options? Learn about the different types of dishwashers to increase efficiency and space in your kitchen.
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Jul 9, 2026Jul 9, 2026
Parts of a Dishwasher: Learn What They Are and How They Work
Understanding the different parts of a dishwasher can help you troubleshoot any issues and know when to call in the professionals.