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 Catharpin, VA

*The Angi rating for Dishwasher Installation companies in Catharpin, VA 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 Catharpin, VA 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 29, 2026

Reviewed in September 2026
Excellent dishwasher repair service! The technician was professional, knowledgeable, and arrived on time. He quickly diagnosed the problem, explained everything clearly, and completed the repair efficiently. The dishwasher is working perfectly now. Very friendly customer service and reasonable...
Aura Appliance Tech
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Reviewed in March 2026
Great experience with the technician! Quickly diagnosed the issue with my dishwasher and explained everything clearly. The repair was done efficiently and my dishwasher is working like new again. Very professional, honest and reasonably priced. Highly recommend!
Sun Home Service, LLC
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Reviewed in September 2025
They repaired my dishwasher and did a fantastic job. Professional, on time, and very skilled—had it running like new in no time. Truly 100 out of 100 service. Highly recommend!
APPLIANCES REPAIR 24X7 LLC
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Reviewed in August 2025
“BrightCrest did an excellent job fixing our dishwasher. It wasn’t draining properly, and they quickly diagnosed a clogged drain pump. They had the part on hand and got it running like new again. Super professional, on time, and fairly priced. Highly recommend!”
BrightCrest LLC
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Reviewed in March 2025
Frank came out and immediately diagnosed our dishwasher's issue. He was efficient, educational, and very professional. We will be using Mr. Appliance for our future needs. Thanks again Frank! You are a lifesaver!
Mr. Appliance of Northern Virginia
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Reviewed in March 2025
Javid was professional and polite. Went through the diagnostic process skillfully and kept me informed while doing so. Unfortunately, I had to replace my dishwasher as the repair costs are almost as close to a new one. But that's because, the parts that needed to be replaced are so costly...
Major Appliances Repair, LLC
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Reviewed in January 2024
Suki was hired to install a dishwasher. He installed it and hauled away the old one. On the job he found a plumbing issue which he was able to resolve as well. He came in on short notice and did a thorough job.
Gravity Remodel
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Reviewed in October 2023
Andi knows appliances. He quickly recognized the problem with my dishwasher, ordered the part, and installed it. Problem solved!
A.G.B Appliance Repair
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Reviewed in July 2023
He was able to schedule the initial visit t fix our dishwasher around our schedule and kept me informed of his arrival time. He diagnosed the issue, ordered the part for overnight delivery, and returned to install the part the next day. He followed up the following day to see if the dishwasher...
City Home Appliances & Services, LLC
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Reviewed in July 2021
Marcus was professional, on time, and was able to help us with our dishwasher. I will definitely look to hire him in the future should I need to!
Gee's Innovative Appliance Repair Techs
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Dishwasher Installation questions, answered by experts

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

It’s not worth fixing a 20-year-old dishwasher or any 20-year-old appliance. Twenty years is beyond the useful life span of nearly every major household appliance. Once the appliance nears the end of its useful life span, repairs will become more frequent. A replacement often becomes more cost-effective at that point.

Water is sitting at the bottom of your dishwasher, likely because the filter is dirty with food debris or because the drain hose has a clog. If the water is still sticking around after following the steps above, it’s time to contact a local plumber.

The most common reason for a smelly dishwasher is a dirty dishwasher filter. The filter is responsible for catching food while your machine is running to prevent clogs. Over time, that filter gets more and more filled with food particles. Cleaning your dishwasher filter monthly can keep the smell at bay.

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 Catharpin, VA 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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