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 Aurora, OH

*The Angi rating for Dishwasher Installation companies in Aurora, OH 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 Aurora, OH 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 February 07, 2026

Reviewed in February 2026
We chose Nick from Shortfix to repair our dishwasher, which had a blocked drain. This happened on a Saturday and, not surprising, many firms are closed for the weekend. Nick was available, so we scheduled an appointment and he arrived at the appointed time. He went right to work and promptly...
Shortfix
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Reviewed in December 2024
install and cleaning went great! Very efficient and skilled. Communication prior to install was great as well! I am even recommending them to a family member.
Rolando's Carpet Installation & Cleaning
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Reviewed in February 2023
The installer was very knowledgeable and took his time to explain everything. Very neat and clean job!
Servisoft Of Middlefield, Inc.
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Reviewed in January 2023
I was in a bind and needed someone to come to my home and install a brand new dishwasher and remove the old one. Clarence called me back within 15 minutes and a half hour later was at my home. He was very thorough and very professional, and I highly recommend him to anyone that needs appliance...
CL's Repair Services
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Reviewed in February 2022
I called Mackin & Sons at 9:15 Friday morning, after finding water leaking under my dishwasher. Mike told me he could have a crew to my house between 10:00-12:00. Anthony and Alex arrived by 10:30. They determined the leak was coming from the dishwasher - which they do not repair. However, they...
Mackin & Sons Plumbing
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Reviewed in March 2021
Installed well. Cleaned up every day. Looks good.
Apex Metal Solutions, LLC
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Reviewed in February 2021
Matt the installer did excellent work and it was done one month ahead of schedule its beautiful
Joyce Windows, Sunrooms & Baths
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Reviewed in November 2020
It took a week to get the part before it could be installed .
A & J Appliance Repair Service
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Reviewed in October 2020
Ace Washer has helped for many years with intermittent problems that have come up with my washer, dryer, and dishwasher. He came out today to look at a leak that we discovered the day before yesterday. He is ALWAYS matter-of-fact, responsive, reliable, honest, fast and very reasonably priced....
Ace Washer & Appliance Service
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Reviewed in September 2020
Very professional and efficient. They repaired my dishwasher and I also hired them for a cleaning service. Very nice people. Reasonable prices and good customer service.
Maid to Repair
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Dishwasher Installation questions, answered by experts

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

A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters.

Yes, if your filter is damaged or simply too debris-filled to be of use, replace it with a new component. Check the instruction manual that accompanied the dishwasher for information as to the specific part. There are many online marketplaces that sell these parts, but perform due diligence to ensure you buy the right one.

Local plumbing codes and manufacturer recommendations typically dictate the minimum distance between a sink and a dishwasher. This is generally 18 to 24 inches, providing enough room for easy loading and unloading of dishes without hindering the sink's function. Maintaining this separation not only adds convenience but also reduces the chances of water damage and optimizes plumbing connections.

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.

The Aurora, OH 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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