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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Q: What are the benefits of having a dishwasher?

• <div><p>A dishwasher can help save you significant time when it comes to getting your dishes clean. It can also get your dishes more hygienically clean than washing by hand due to higher water temperatures and specialized detergents, effectively sanitizing them and reducing the risk of foodborne illnesses. Compared to hand-washing, a dishwasher typically uses less water and energy to clean the same amount of dishes, making it a more resource-efficient option.</p><p> </p></div>

Q: How much does it cost to fix a leaking dishwasher?

• <div><p>The average <a href="https://www.angi.com/articles/how-much-do-dishwasher-repairs-cost.htm">cost to repair a dishwasher</a> that&rsquo;s leaking is <b>$200</b>, but your total will depend on the underlying problem. Having a professional replace a faulty door gasket or a gasket in a supply line could cost as little as <b>$50,</b> while replacing a leaking dishwasher pump could total as much as <b>$600</b>.</p></div>

Q: Can I install or repair a dishwasher myself?

• <div><p>DIY installation or repair is possible with the right skills and tools, but if not done correctly, it can often lead to water leaks or improper connections.</p></div>

Q: Does a dishwasher drain hose need a loop?

• <div><p>To create a siphon break and remove any chance of dirty sink water or water that backs up into the sink from getting into your dishwasher, your dishwasher drain hose needs to have a high loop or an air gap device as part of its installation. All building codes require at least a high loop. In many places, it&rsquo;s necessary to install an air gap device to meet the code.</p></div>

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Verified Reviews for Dishwasher Installation pros in Descanso, CA

*The Angi rating for Dishwasher Installation companies in Descanso, 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 Descanso, 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 August 13, 2026

Reviewed in August 2026
The installation was well organized from beginning to end. The team arrived prepared, worked efficiently, kept everything tidy, and made sure I understood the operation of the new garage door.
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Reviewed in December 2025
Install new locks by Locksmith Alpine CA was completed with excellent precision and care. Professional installation, high-quality hardware, and improved security delivered reliable, long-lasting protection.
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Reviewed in May 2024
Professional and very fast installation without details at work. Recommended!!
Bovey Raingutters, Inc.
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Reviewed in January 2022
Professional tile installation. Job was done quickly. They really know what they are doing.
Colombo Tile
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Reviewed in November 2021
FANTASTIC! We had Mauzy come out and service our units and clean our Air Ducts. We can already tell that our systems are running more efficient. They were on time, clean, and thorough. They recommended we replace our 16 year old thermostats. We had them install new smart thermostats. It is...
Mauzy Heating, Air & Solar
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Reviewed in December 2020
We contracted with Shugarman's for a Bathtub/shower tear out and a new walk in expanded shower with glass door enclosure. First of all our in home sales presentation was so good and the price and quality of materials were just what we were looking for that we canceled our other appointments...
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Reviewed in October 2020
Rick installed a new replacement service/breaker box for our in-law unit. He was friendly, highly professional, extremely conscientious and completed the job much quicker than expected. Rick really knows his trade and I would highly recommend him and gladly use him again.
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Reviewed in October 2020
Project: Install Luxury Vinyl flooring, Base Boards and Door Casings. Did a great job! Would recommend.
Ariel Builders, Inc.
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Reviewed in July 2020
CleanTech guided us through a complicated water heater problem - where both the manufacturer and the installer wanted to avoid resolving the issue. We thought our recently installed and badly leaking water heater had to be replaced, but Pablo from CleanTech fixed both manufactureing and...
CleanTech Energy Solutions, Inc.
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Reviewed in July 2020
On time, and explained what had to be done. Living out here in Pine Valley it can be difficult to get anybody to come out to even bid. Not a big job, 5 checked off, 1 didn't call back, two weren't interested, to far, and one sent a salesman. The one installer did a great job, and finished quickly
ASI Plumbing, Heating & Air
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Dishwasher Installation questions, answered by experts

A dishwasher can help save you significant time when it comes to getting your dishes clean. It can also get your dishes more hygienically clean than washing by hand due to higher water temperatures and specialized detergents, effectively sanitizing them and reducing the risk of foodborne illnesses. Compared to hand-washing, a dishwasher typically uses less water and energy to clean the same amount of dishes, making it a more resource-efficient option.

The average cost to repair a dishwasher that’s leaking is $200, but your total will depend on the underlying problem. Having a professional replace a faulty door gasket or a gasket in a supply line could cost as little as $50, while replacing a leaking dishwasher pump could total as much as $600.

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.

DIY installation or repair is possible with the right skills and tools, but if not done correctly, it can often lead to water leaks or improper connections.

To create a siphon break and remove any chance of dirty sink water or water that backs up into the sink from getting into your dishwasher, your dishwasher drain hose needs to have a high loop or an air gap device as part of its installation. All building codes require at least a high loop. In many places, it’s necessary to install an air gap device to meet the code.

The Descanso, 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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