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 most common cause for a dishwasher not to drain?

• <div><p>If your dishwasher isn’t draining, some common causes include a clogged drain filter, drain hose, or air gap. Also, if you have a garbage disposal, a clog in the disposal can back up your dishwasher since they share plumbing, as can a clog in your kitchen sink’s plumbing. A handy DIYer may be able to figure out <a href="https://www.angi.com/articles/how-to-unclog-dishwasher.htm">how to unclog a dishwasher,</a> but you may need to call in a plumber if you can’t locate and clear the clog yourself.</p></div>

How long will it take to install my dishwasher?

• <div><p>Installing a dishwasher should take one to four hours, depending on the complexity of the installation and whether you DIY or hire a pro. Even if you're particularly handy, installing a dishwasher on your own will likely take longer — at least two hours. On the other hand, a professional can likely install a dishwasher in about an hour. Installation time will take longer if you have to remove an existing dishwasher, reroute plumbing, or repair damaged flooring underneath the appliance.</p></div>

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Verified Reviews for Dishwasher Installation pros in Folsom, CA

*The Angi rating for Dishwasher Installation companies in Folsom, 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 Folsom, 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 April 23, 2025

Reviewed in April 2025
The dishwasher installation was completed efficiently and professionally. The technician arrived on time, was courteous, and made sure everything was working properly before leaving. Very satisfied with the service?thank you!
Samvel Bazoian
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Reviewed in December 2023
Kel was awesome. He came right in and knew in a matter of minutes what the problem with my dishwasher was. He ordered the part on site and then came back a few days later the fix the issue. He was fast, friendly and affordable.
Sac Metro Appliance Repair
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Reviewed in March 2023
I met Richard over 10 years ago. I was looking to get my kitchen floor replaced. I got 3 bids and Richards was the middle one. I just love the time he took on answering all of my questions, even stopping in the middle of the job. Very few put tile under the dishwasher , Richard does it the...
Crawfords Tile
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Reviewed in October 2022
John was able to come out and resolve our issue of needing to replace a splice box with a proper outlet for a replacement dishwasher the same evening we found out this needed to be done.
Community Electric
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Reviewed in September 2022
Respond quickly and did a fast job repairing the dishwasher and disposal.
Qualified HVAC
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Reviewed in September 2022
The service was timely and the technician took the time and attention when installing also had parts that did not come with our dishwasher to complete the installation.
A to Z In Home Appliance Repair
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Reviewed in January 2021
Paul was Quick to respond to my request for service call. Very professional on the phone. Kept appointment that was set up. Efficient and knowledgeable n finding problem with my dishwasher. Thoroughly explained the problem and made the repair. Dishwasher running great now. Reasonable...
NORTH POLE SUPPLY INC.
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Dishwasher Installation questions, answered by experts

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.

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

Basic maintenance, such as cleaning filters, is DIY-friendly, but repairs involving electrical components, pumps, or valves should be handled by a professional.

If your dishwasher isn’t draining, some common causes include a clogged drain filter, drain hose, or air gap. Also, if you have a garbage disposal, a clog in the disposal can back up your dishwasher since they share plumbing, as can a clog in your kitchen sink’s plumbing. A handy DIYer may be able to figure out how to unclog a dishwasher, but you may need to call in a plumber if you can’t locate and clear the clog yourself.

Installing a dishwasher should take one to four hours, depending on the complexity of the installation and whether you DIY or hire a pro. Even if you're particularly handy, installing a dishwasher on your own will likely take longer — at least two hours. On the other hand, a professional can likely install a dishwasher in about an hour. Installation time will take longer if you have to remove an existing dishwasher, reroute plumbing, or repair damaged flooring underneath the appliance.

The Folsom, CA 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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