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>

Get matched with top dishwasher installation pros in Manhattan, IL

Enter your zip and get matched with up to 5 pros

Need a pro for your dishwasher installation project in Manhattan, IL?

Select your specific project to find the pro for you.

TRUSTED BY MANHATTAN, IL HOMEOWNERS

4.5
Average homeowner rating
341
Verified dishwasher installation services reviews

Verified Reviews for Dishwasher Installation pros in Manhattan, IL

*The Angi rating for Dishwasher Installation companies in Manhattan, 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 Manhattan, 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 July 18, 2026

Reviewed in July 2026
Dan responded quickly and gave a fair estimate for the replacement of a garbage disposal and faucet. He was incredibly professional, and I could tell he was experienced in his field. When he came to fix it, he got right to work, and I was so impressed when he cleaned up and took the disgusting...
Goodfellas Sewer and Drain Specialist
Request a quote
Reviewed in June 2026
The worker fixed the dishwasher very quickly. It was an easy fix but I did not know how to do it. I give him a 5 star rating.
A+ Appliance Repair and Maintenance
Request a quote
Reviewed in March 2025
Installers were very thorough in Replacing water heater and cleanup
TF Sullivan Plumbing, Inc.
Request a quote
Reviewed in January 2024
i highly recommend. very sweet and professional people. they were in and out in 20 minutes. they took out my old fridge and dishwasher that i have been putting off getting rid of for years. they got themselves a forever customer.
NMNS
Request a quote
Reviewed in March 2023
Ryan, the owner of the company did the installation. He has a GREAT personality and is very knowledgeable about wells and treatment systems. The installation was PERFECT and I am very pleased with the system he installed. I VERY HIGHLY RECOMMEND his company for anyone that needs a GREAT water...
Aquatico Water Solutions, LLC
Request a quote
Reviewed in January 2022
Sales rep very professional and the installers did a great job.. very courteous
Bath Planet of Chicago
Request a quote
Reviewed in January 2022
I was a little apprehensive because he was late, but he talked through what he was doing. (Troubleshooting at first to make sure nothing was missed). And then when he found the problem (pinched wires that had snapped in the dishwasher door, causing intermittent stopping/starting), he showed it...
Star Appliance Repair & HVAC
Request a quote
Reviewed in August 2021
Chris was very profesional, punctual and kind when he repaired my dryer, he even had the part right in his truck. I also asked him to fix my dishwasher, so he came back with a new part he ordered. After an hour and a half Chris realized he wasn't going to be able to fix it properly and suggested...
A Blueline Appliance Repair Service
Request a quote
Reviewed in January 2021
Super helpful with dishwasher installation in our older home!
MLK Installations
Request a quote
Reviewed in January 2021
Chris came out same day as service requested. He checked over the dishwasher and he reset the breaker and advised that should do it. There was no need for a new mother board. He was polite, professional and we were very satisfied.
A Blueline Appliance Repair Service - Home Facebook
Request a quote

Find Dishwasher installation pros in Manhattan

No results for Dishwasher installation pro in

Try adjusting your search criteria.

Dishwasher Installation questions, 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.

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

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.

Installation includes leveling the unit, connecting water and electrical lines, securing the unit, and testing for function and leaks.

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

The Manhattan, 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]
Discover the average dishwasher installation cost, key price factors, and tips to save on your project. Get transparent, expert-backed estimates.
Heather Ayer
•
Jul 8, 2026Jul 8, 2026
How Much Does a Dishwasher Cost?
Whether you’re replacing an old dishwasher or buying your first, find out more about dishwasher costs, including new dishwasher installation.
Amy Freeman
•
Jul 10, 2026Jul 10, 2026
How to Install or Replace a Dishwasher
You don’t always need a pro for appliance installations. Use this guide to learn how to install a dishwasher on your own.
Kate Fann
•
Jul 9, 2026Jul 9, 2026
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.
Kate Fann
•
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.
Kyle Schurman
•
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.