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 Atherton, CA

*The Angi rating for Dishwasher Installation companies in Atherton, 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 Atherton, 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 January 30, 2026

Reviewed in January 2026
We needed a building cleanout installed as a requirement for our remodeling project. Cornelio was very thorough in investigating what were the requirements for the inspection. He installed a dual cleanout following all the requirements which will help us in case of any backups in the future. He...
Green Arrow Plumbing
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Reviewed in January 2026
Good quick service. They did the install in one day notice and it came out to just under $4k for a tankless install. Professional clean work.
Tankless Plumbing Solutions
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Reviewed in November 2025
My only issue is they're overpriced. They also don't put dishes away and will only load a dishwasher.
Molly Maid of S. Silicon Valley
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Reviewed in June 2023
Said Abdullah was the worker on this follow up, did a thorough excellent job, on investigating possible openings for rats, and then addressed the problems (under kitchen sink, behind dishwasher). Outstanding work, highest ratings possible are earned. Huge relief after poor response by another...
Attic Pros
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Reviewed in July 2022
My dishwasher was making a terrible noise and water was running all over the floor. After trying to solve the problem myself for a couple of hours, Vadim was able to diagnose and resolve the problem quickly. From the initial call at 8:30pm to resolution at 9:30pm, the issue was resolved...
Happy Again Appliance Service
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Reviewed in May 2020
I hired him to install HVAC at my home. He was easy to work with and did an excellent job. He is a professional and I would consider hiring him again.
CaliforniAir Heating & Air Conditioning
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Reviewed in January 2020
Sugar Bear Service reps did a good job and worked hard on getting the wiring reset and installing the new water heater. It seemed expensive at the time,
Sugar Bear Plumbing, Inc.
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Reviewed in December 2019
Problem promptly solved. Johe cleaned out the discharge hose that runs from the dishwasher to the device on the rim of the sink, and another hose from the device on the rim of the sink to the disposal. There was nothing wrong with the dishwasher itself. He recommended throwing half a cup of...
Silicon Valley Appliance Service And Repair LLC
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Reviewed in November 2019
The installer did a great job. This is the second time we have used them. I highly recommend their services. Quality does cost money, if you want the lowest bid they are not for you. But if you want quality work go with them.
Bay Area Climate Control, LLC
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Reviewed in June 2019
called me immediately. At property within 30 minutes. Went out and bought water heater for me and installed within 2 hours. Trouble free. So happy.
LM Plumbing and Drain Cleaning
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Dishwasher Installation questions, answered by experts

A dishwasher filter should be replaced every five years, depending on the manufacturer's recommendations and the frequency of use. The exact timing can vary based on factors such as the hardness of your water, how well you rinse dishes before loading them, and how often you clean the filter. Regularly inspect the filter for signs of wear and tear or damage. If the filter appears worn out, damaged, or excessively clogged despite regular cleaning, it should be replaced sooner.

Installation includes leveling the unit, connecting water and electrical lines, securing the unit, and testing for function and leaks.

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.

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

Professional repair is advisable for electrical issues, refrigerant leaks, or unfamiliar problems. Technicians can accurately diagnose and fix such problems, ensuring safety and appliance longevity.

The Atherton, 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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