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 Long Beach, CA

*The Angi rating for Dishwasher Installation companies in Long Beach, 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 Long Beach, 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 May 29, 2026

Reviewed in May 2026
Wow! Best home improvement experience ever. We recently had a primary bath done; the product and installation were impeccable from Shugarman's Bath. No hassles. The sales rep was honest, knowledgeable, and a pleasure to work with. The company's paperwork was easy to understand. The...
Shugarman's Bath
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Reviewed in January 2025
Wow! Walter is professional, highly skilled, thorough and conscientious. He even took his shoes off, unsolicited, before entering the house! We needed a sink and dishwasher installed. We have an 85 year old house and plumbing to match. There were challenges, but Walter was quickly able to...
Walter & Stefan Plumbing - Unlicensed Contractor
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Reviewed in December 2023
Awesome! Daniel's customer service is terrific, above and beyond the norm! He came for the oven but also fixed the dishwasher and checked out the electrical issues. Knows his business well! Will hire him for future jobs!
Pacific Coast Services - PCS
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Reviewed in January 2023
The installers showed up right on time and were friendly and efficient. They quickly removed my old furnace and installed the new one, making sure to clean up any debris created.
Top Energy Solutions, Inc.
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Reviewed in September 2022
Installer was well organized, punctual and knowledgeable.
Door MD - Unlicensed Contractor
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Reviewed in February 2022
The installers were knowlegable and courteous.
SoCal Climate Control - LA
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Reviewed in November 2021
INSTALLER WAS VERY PROFESSIONAL AND EXPLAINED WHAT WAS BEING DONE AND WAS VERY FRENDLY.
1st Choice Water Solutions LLC
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Reviewed in August 2021
Installers showed up on time. Courteous and professional. Customer service and install scheduling was a pleasure to deal with.
Service All Stars Heating and Air Comfort
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Reviewed in April 2021
Trevor was prompt, knowledgable, and efficient. He installed a dishwasher we had disconnected for a move with no issues. He was courteous during the service. Highly recommended.
Tech Cert Appliance Repair
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Reviewed in March 2021
Barrett did a great job for me. He installed a hot and cold water system, garbage disposal,faucet, and dishwasher. Showed up as promised and was very good to work with.
The Power Plumber, Inc.
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Dishwasher Installation questions, answered by experts

Yes, vinegar is an excellent homemade solution to clean a dishwasher. Its acidity will cut through any buildup, while its natural deodorizing capabilities will take care of any nasty smells.

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.

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.

Your dishwasher drains through a hose that attaches to the plumbing below your sink or snakes out the back of your machine. In most cases, you can access one side of the hose from below your sink, as it usually ties into the same drainline that your sink uses. Otherwise, you may need to pull the dishwasher out of the counter to access it.

Maintenance includes regular filter cleaning, checking water connections, and ensuring that the unit operates at optimal efficiency without blockages.

The Long Beach, 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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