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 Sink Repair pros in Devon, PA

*The Angi rating for Sink Repair companies in Devon, PA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sink Repair needs.

*The HomeAdvisor rating for Sink Repair companies in Devon, PA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Sink Repair needs.

Last update on August 08, 2025

Reviewed in August 2025
D Myers is a very nice guy and he came at 7:30 pm to help us out and solved the problem, of the clogged sink. We intend to call him again when we need a handyman.
D Myers Handyman Services
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Reviewed in October 2024
Excellent customer service and repair execution
Certified Drain Experts, LLC
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Reviewed in April 2024
I took the opportunity to get advice from someone who repairs them and would know, what should I buy as a replacement.
Bear Service LLC
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Reviewed in April 2023
Have been using him as my consistent plumber. Any time I call. He's there. He has installed a dishwasher for me, 2 sinks, 2 toilets, garbage disposal, sewage pipes, and other things I don't recall. Have referred him to numerous family and friends of mine.
High Quality Plumbing & Heating
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Reviewed in November 2022
If you need any furniture repairs done, David is amazing. I had several other people tell me my table couldn't be repaired, without totally refinishing it. But David was able to make it like new. I was so happy with his work I had him back to touch up my kitchen cabinets and dining room suit.
Woodwise On-Site Furniture Repair, LLC
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Reviewed in June 2022
We had a clogged kitchen drain line causing water to back up into our sink. Montco Rooter was able to come out the same day and fix our issue. The crew was friendly and professional and took special care to leave the area cleaner than when they arrived. Grateful for their service.
Montco Rooter Plumbing & Drain Cleaning, LLC
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Reviewed in April 2022
Very knowledgeable, Professional -Instead of unnecessary repair -he assessed the problem and advised the root of the issue. I had another plumber out twice for the same problem and gauged. Toilet now working. He also repaired an old faucet because of his honesty
ValDel Plumbing, LLC
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Reviewed in March 2022
Did not see a need to repair.
Mid-Atlantic Roofing & Siding
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Reviewed in October 2021
Was able to complete repair at no additional cost when an unexpected problem arose.
Hutchinson Plumbing Heating Cooling, LLC
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Reviewed in March 2021
The work was completed but not without challenges. The project was to replace the shut-off valves under the vanity. The water was shut from the main shutoff valve. While the work was being done in the bathroom upstairs, I noticed water leaking from my Living room ceiling below. The bathroom had...
Stong Plumbing
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Sink Repair questions, answered by experts

Plumbing installation costs in renovations typically range from $300 to $1,500 or more, depending on the complexity and specifics of the project.

If your kitchen is flooding, first turn off the water supply and electricity before entering the room. Next, focus on immediate flood control by cleaning up any standing water with a sump pump or wet-dry vacuum to prevent long-term water damage to your home. Open your windows and run any dehumidifiers you have handy. Finally, call a professional plumber to help find the source of the flood and repair it.

Depending on the issue, you have a good shot at fixing a leaking sink yourself. If you have some plumbing experience or are comfortable with DIY jobs, you can clean the P trap, tighten nuts, replace washers, and replace shut-off valve stems on your own. For more complicated jobs, such as repairing a garbage disposal, calling a pro may be the way to go.

The main cause of bathroom leaks is seals and connectors that loosen or deteriorate over time, causing leaks to develop. It's important to stay on top of your bathroom materials, as toilets, showers, and sinks all have different lifespans. Toilets and faucets last between 10 and 15 years on average with regular maintenance, but different parts may have shorter lifespans than others.

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 Devon, PA homeowners’ guide to sink repair services

From average costs to expert advice, get all the answers you need to get your job done.

See all articles

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