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>

What is the standard size of a dishwasher?

• <div><p>A standard <a href="https://www.angi.com/articles/dishwasher-sizes.htm">dishwasher size</a> is 24-by-24-by-35-inch for a built-in unit. The depth and height line up perfectly with most kitchen countertops and cabinet sizes. </p></div>

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433
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Verified Reviews for Dishwasher Installation pros in Riverton, NJ

*The Angi rating for Dishwasher Installation companies in Riverton, NJ 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 Riverton, NJ 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 September 03, 2025

Reviewed in September 2025
Josh did a great job fixing the garage dispposal which was clogged and the dishwasher, explaining what was wrong and what to know moving forward based on usage.
M.C.R PRO LLC
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Reviewed in November 2024
very professional install, cleaned up afterwards...received many compliments from neighbors re the installation.
Power Home Remodeling
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Reviewed in November 2024
We have used Egan plumbing for more than 10 years. Kevin has installed a dishwasher, hooked up the water for my fridge, fixed several leaks, and repaired my toilets and sinks. He is extremely professional, does great work, and is accommodating for emergencies. His prices are fair he...
Egan Plumbing Repair
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Reviewed in September 2024
He was amazing. Went above and beyond, coming by on a Sunday night to install our dishwasher. He gave us tips on how to use our dishwasher and what to watch out with our plumbing. He was detailed in his work, making sure things were aligned to match our counters.
VICC LLC
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Reviewed in August 2024
The installers were polite, courteous, and did a really nice job cleaning up
Premier Home Pros, LLC
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Reviewed in December 2022
Went well. Installer was friendly
VIP Telecommunications LLC
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Reviewed in October 2020
Found everything in this company that I was looking for,needed a dishwasher installed,after the retail store couldn’t because they don’t do jobs like this they only deliver. Christian answered the phone after I had called he was very polite and helpful he took on the job for me specially after...
Lehigh E.I.F.S. Repair
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Reviewed in September 2020
Amine came on schedule diagnosed problem made recommendation and is going to be back to install new dishwasher when it arrives
Best Appliance Repair - Home Facebook
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Reviewed in July 2020
Robert and his crew were amazing. Friendly, professional and respectful of our property. We actually had him come back to do work so we could have a new dishwasher installed and plan on calling him when we are ready to have other work we have been planning done.
M.T.D Drains L.L.C
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Top-Rated Dishwasher installation pros in Riverton - Updated Nov 2026

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Dishwasher Installation FAQs, answered by experts

To create a siphon break and remove any chance of dirty sink water or water that backs up into the sink from getting into your dishwasher, your dishwasher drain hose needs to have a high loop or an air gap device as part of its installation. All building codes require at least a high loop. In many places, it’s necessary to install an air gap device to meet the code.

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.

A standard dishwasher size is 24-by-24-by-35-inch for a built-in unit. The depth and height line up perfectly with most kitchen countertops and cabinet sizes.

Repair costs vary by issue, typically from $100 to $500, depending on the parts needed and labor involved.

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

The Riverton, NJ 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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