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

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Last update on January 19, 2026

Reviewed in February 2024
Kollin was great about working around my schedule when doing the install process and the new floor looks great!
Silver Creek Flooring
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Reviewed in December 2020
They did awesome work removing and installing drywall for me. They were able to do this very quick, and cleaned up well afterwards. While they did the job they also kept me very informed and brought any concerns to me. Will work with them again!
Builders Services
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Reviewed in October 2020
THEY DID AN AWESOME JOB! My father needed a roll in shower so he could remain independent and they were great from design right through the install!
Bathworks of Michigan, LLC
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Reviewed in March 2020
March 10 & 11, 2020 was an exciting day for our household. It was bathroom demo and installation day. Two weeks earlier our Maxtrix (Ballard the owner) Sales Rep Christopher P came over to take measurements and discuss our selections,costs and put the plan in motion. Christopher Parkhurst...
Matrix Home Solutions
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Reviewed in June 2017
the installers was very friendly and knowledgeable
OUT BACK FENCE
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Reviewed in April 2015
I was beyond impressed with the service we got from Scott and his team at Carpet One. I would highly recommend him to anyone without a doubt. We walked into the store a few weeks ago and he showed us some new carpet fibers (Triexta) that were earth-friendly (they are made out of bio-waste from...
Main Floor Carpet One Floor & Home
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Reviewed in June 2014
They came and installed internet in our house. All went well and it works good
Comcast Sterling Heights
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Sink Installation questions, answered by experts

You can choose a few different options for outdoor kitchen sink drainage. You can install a dry well about 10 feet away from your home or patio or install a French drain closer by. You can also drain into your home’s plumbing system, but it is more costly versus using a dry well.

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.

Many parts of your plumbing system can fail, but clogged drains are one of the biggest plumbing problems you’ll likely encounter. From your kitchen sink, bathroom sink, or bathtub, there are plenty of opportunities for gunk, hair, food scraps, and more to get stuck in drains. When this happens, water will slowly drain, leading to standing water, bad odors, drain flies, and other issues.

Many homeowners can handle a minor clog themselves, but if you have a clog in your main line, you’re best off hiring a local plumber to get the drain back to its normal flow rate.

DIY is not recommended for commercial settings due to safety and code compliance. Hire licensed professionals.

Most installations take 2-4 hours, while extensive plumbing work or under-mount sinks may require an entire day.

The Pierson, MI homeowners’ guide to sink installation services

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