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>

How do I know if my dishwasher drain hose is clogged?

• <div><p>Your dishwasher drain hose may have a clog if your dishwasher is full of water, your dishes aren’t getting cleaned, or water takes a long time to discharge into the garbage disposal.</p></div>

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Verified Reviews for Dishwasher Installation pros in Narberth, PA

*The Angi rating for Dishwasher Installation companies in Narberth, PA 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 Narberth, PA 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 December 21, 2025

Reviewed in December 2025
Diagnosed and replaced dishwasher motor fail just fine but agreed to also re-install surrounding cabinets that weren't installed correctly when the home was built. That required him hiring another guy who was arrogant and tried to convince me that the job was done and perfect. I knew it wasn't...
Lenny Handyman LLC
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Reviewed in January 2025
It took several visits to make my dishwasher operational again. I was very happy with Nathan?s willingness to work long hard hours to fix the issues.
HK Handyman
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Reviewed in February 2024
John has helped me many times with installing and repairing washers/dryers/toilets, plumbing, electrical and HVAC work. He is reasonable, professional, and and easy to work with. I highly recommend his services.
Rachko Mechanical
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Reviewed in November 2022
Jeff was here within a couple hours of being in touch. He explained everything thoroughly, made sure everything was up to code, and installed the new water heater quickly. Start to finish great experience. Would use again.
Water Heater Express
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Reviewed in November 2022
The installers were on time, clean and courteous. Would use again and will recommend others.
Green Eco Solutions
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Reviewed in December 2021
Easy to schedule and responsive office. Eyal spent time to properly determine the source of an unusual dishwasher leak and shared tips on operation and maintenance. Fair pricing. Would highly recommend.
Aviv Appliances
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Reviewed in June 2021
Work done neatly and quickly at a fair price. Carrier system installed. Inspection one day, estimated next day, installed two days later. Installers very friendly and worked very hard to install system in old row home.
Sila Heating, Cooling, Plumbing, & Electrical
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Reviewed in April 2021
They were clean, efficient and courteous. A month after the original installation, I found an issue which was quickly and completely resolved at no additional cost. I would highly recommend Carmen and his outstanding installer Wajeeh.
Floors by Napoli
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Reviewed in December 2020
Jim did an excellent job installing our new dishwasher. He was responsive, knowledgeable and attentive to our questions and requests. We would highly recommend him for future in home work.
McCaffrey Home Improvement
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Reviewed in March 2020
Bear did a great job replacing the door lock mechanism on my Miele Dishwasher and didn’t try to up-sell me like another repair place did... Communication and timeliness were excellent. James got the job done quickly and for a reasonable price. We will call them again.
Bear Service LLC
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Dishwasher Installation questions, answered by experts

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.

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.

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

Your dishwasher drain hose may have a clog if your dishwasher is full of water, your dishes aren’t getting cleaned, or water takes a long time to discharge into the garbage disposal.

To extend the lifespan, clean filters regularly, run cleaning cycles with vinegar, avoid overloading, and check for leaks.

The Narberth, PA 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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