Best basement waterproofing pros near Duarte, CA

Q: Are there downsides to waterproofing the basement?

• <div><p>Some basement waterproofing methods can actually cause your water or moisture problems to get worse, which is why it&rsquo;s so important to call in a professional who knows how to solve your underlying issue and use the appropriate waterproofing methods. An example of this would be applying latex waterproofing paint to the insides of your basement walls without fixing the water issue outside. Doing so can trap moisture in the basement walls, which can promote mold growth, peeling paint, and even damaged concrete. However, when done by a professional, the only downside to basement waterproofing is the up-front cost. </p></div>

Q: What material do you use to waterproof a basement?

• <div><p>&ldquo;Basement waterproofing&rdquo; sometimes refers to applying a waterproof sealant to basement walls, in which case you would use a waterproof paint, often made of latex. However, there are many methods you can use to waterproof a basement, including exterior drainage systems, interior drainage systems, dehumidifiers, and more. As such, the materials you use can vary depending on the methods you use.</p></div>

Q: What is the best way to waterproof your basement?

• <div><p>The best basement waterproofing method depends on the specific issue causing the water intrusion. For minor problems, simple solutions like installing a properly functioning gutter system to direct runoff away and grading the soil to slope away from your foundation can be effective.</p><p>If you have more significant water problems, the solution will need to be more robust:</p><ul><li><p>For standing water on the basement floor, a floor drain or a sump pump system may be the best solution.</p></li><li><p>For water pooling around the foundation, installing an exterior French drain can intercept water before it reaches the basement walls.</p></li></ul><p>Other effective waterproofing methods, which can be used depending on your home's specific needs, climate, and soil type, include sealing the interior walls, landscape alteration, installing interior drainage systems, and using a dehumidification system to control moisture levels.</p></div>

Q: Why are houses built with crawl spaces?

• <div><p>The primary reason homes have crawl spaces is so the foundation can reach down below the frost line to avoid dangerous soil movement and structural damage when the ground freezes. They&rsquo;re more popular in colder climates where the ground freezes down to a few feet, and slabs are most popular in warmer areas where there is no frost line. Crawl spaces also provide a space for utility lines to run where they&rsquo;re at less of a risk of freezing.</p></div>

Q: Why does my crawl space smell like a sewer?

• <div><p>A sewage smell in your crawl space is usually from a damaged or clogged pipe leaking sewer gasses or actual sewage underneath your home, but there are some other common causes. Moisture, from poor or damaged encapsulation or a malfunctioning sump pump, can harbor mold and bacteria, causing a musty smell. Pests can also get stuck in your crawl space and die, which causes a sewage-like odor. </p></div>

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Verified Reviews for Basement Waterproofing pros in Duarte, CA

*The Angi rating for Basement Waterproofing companies in Duarte, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

*The HomeAdvisor rating for Basement Waterproofing companies in Duarte, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Basement Waterproofing needs.

Last update on October 09, 2026

Reviewed in October 2026
Rogelio Hernandez did an excellent job by removing all of the damaged water proof surface on my balcony and replacing all of the damaged wood framing (due to water and termite damage). He gets my appreciation for his professionalism, ability to adapt to unexpected issues and good communication...
HERNANDEZ FRAMING
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Reviewed in October 2025
I hired Green Laser Roofing Company to fix a roof leak and apply a waterproof coating. The team was professional, friendly, and punctual throughout the entire project. They explained every step clearly and made sure the work was done to a high standard.
Green Ladder Roofing Company
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Reviewed in July 2025
We hired him to repair ceiling water damage. He did an excellent job. He is very professional and kind. I recommend him highly.
Botello's Maintenance
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Reviewed in August 2023
My floor flooded. Hector and Umberto moved EVERYTHING out of my house and set up fans and dehumidifiers. I was so pleased at how expertly they wrapped my things and furniture to move into the pod they provided. They moved it all so quickly. I was so surprised that they could keep working until...
AYS Plumbing & Rooter
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Reviewed in September 2022
Rocky was a pleasure to work with. He went the extra miles to visit several times before his job actually had to start just to make sure the contractor was doing their job getting everything ready for Rocky to come in with his waterproofing team.
Syntech Roofing and Waterproofing
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Reviewed in October 2021
The Zippy guys communicated well, were on time, quick and efficient. I was afraid there would be a lot of water leaking under doors and that was not the case. The place sparkles, and after the Bobcat Fire, things were looking rough. They even did my garage door free of charge!
Zippy Exterior Services, LLC
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Reviewed in January 2019
I bought a condo with mold problems under the bathroom tile. When Frank removed the old tile he saw that no one had "waterproofed" the wall underneath. So he did the correct preparation before installing the new tile. Frank was pleasant, helpful, creative, flexible, reliable, knowledgeable, and...
Frank Gonzalez Tile
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Reviewed in December 2017
the work was great and the experience from start to finish on this extensive project (replacing two whole HVAC systems) was as good as i could hope for. but it's been a month and they have yet to remove the old furnace that they replaced from my basement. i don't relish the idea of...
N.R.G Green Home
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Reviewed in March 2014
I contacted Chad after it was clear that my previous hire didn't know how to properly waterproof a bathroom, and also didn't know how to cut tile without chipping and damaging the edges. Burned once, I interviewed 5 different specialists in bathroom tiling, asking each of them to explain how...
Chad Deiter Company
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Reviewed in January 2013
He looked in the attic and basement for rodents. He closed up some holes for me.
WALSH'S PEST CONTROL
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Top-Rated Basement waterproofing pros in Duarte - Updated Nov 2026

Alpha Structural, Inc.

4.6(

241

)

Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Duarte, CA and surrounding areas

Approved (Corporate)

In business since 1992

Free estimates

Emergency services offered

"Dan was here this morning, showed him where water was leaking in over our slab and ruining the flooring in the master bedroom. He gave me the full range of possible remedies, from installing a eaves gutter on the roofline outside the bedroom to a full (very expensive) sealing of the entire exterior foundation. And actually recommended that we start with the gutter (which I can do myself) and then monitor the area next rainy season and see if that fixes the problem. No pressure to hire them or spend big $$, just good advice. Couldn't have asked for more. Highly recommended- this is real service!"

Deck Expansion and Slope Failure with Retaining Wall

+323

Response time10 hrs

Response rate100%

11 neighbors recently requested a quote

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Western Rooter & Plumbing

4.8(

172

)

Basement Drainage Channels - Install

Serving Duarte, CA and surrounding areas

Approved

In business since 1981

Free estimates

Emergency services offered

"This is the 5th or 6th time Western Rooter and Plumbing does a plumbing job in my house over past 10 years. They installed softwater tank, replaced waterheater, fixed plumbing, and more. Always excellent"

Ruben installs a new drainage system under a customers home. Working in a crawl space is rough, but we do what is needed.

Backing up? Got roots? Blast those roots out with a Hydro Jetter! We use a wart hog nozzle that combines controlled rotation with a unique 8 jet cutting configuration optimized for removing roots. It’s better with a jetter! Call us! We got this! ??

No drain clog too big or small, Western Rooter covers them all!
Justin clearing a Kitchen sink back-up after the Memorial holiday.

HALO 5 whole house water filtration system.

+542

Response time12 hrs

Response rate100%

8 neighbors recently requested a quote

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Golden Blade Grading Inc.

4.8(

)

Basement Drainage Channels - Install

Serving Duarte, CA and surrounding areas

Approved

In business since 2020

Free estimates

Credit card accepted

Ay Golden Blade grading Inc. We take great pride in our experience, expertise, quality and customer service that we provide to meet the consumers' needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large or small the job

Response time2 days

5 neighbors recently requested a quote

Recommended by80%of homeowners

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RSF Construction Inc.

1.0(

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Duarte, CA and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

RSF Construction Inc. is a leader in providing our customers with the highest quality service in an honest, efficient, and professional way. Our pledge is to create successful relationships with our customers, employees and community by building trust, treating every project with the utmost integrity and exceeding expectations. We look forward to working with you!

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Palm Construction, Inc.

5.0(

112

)

Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Duarte, CA and surrounding areas

In business since 2016

Free estimates

Credit card accepted

It can be a daunting task looking for not only the right contractor for your job but also the right contractor for you. We completely understand what you're going through. We know every customer has different desires, different needs and different schedules. We're not only here to turn your ideas into reality but to make it a memorable experience every step of the way. Call us right now, no matter where you are in the planning process.

Recommended by100%of homeowners

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Palm Construction, Inc.

5.0(

)

Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Duarte, CA and surrounding areas

In business since 2016

Free estimates

Credit card accepted

"We worked with Ali (sales manager) and Tony (project manager), who took the time to design a project that made sense for our property and our budget, made a number of suggestions and recommendations and were never pushy or tried to "sell" us on something. The crew really went above and beyond to provide top quality workmanship and overall we were in very good hands. Highly recommended!"

Recommended by100%of homeowners

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Duarte, CA and surrounding areas

In business since 1988

Free estimates

Emergency services offered

"I got a complete package from this company and they well. From the roof repair to the insulations repairs, they ensured that I got value for money."

+290

Recommended by85%of homeowners

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Duarte, CA and surrounding areas

In business since 1986

Free estimates

Credit card accepted

"As advertised, Project Manager, Joe, was excellent."

The Sure Safe VR-1 Foundation is fully patented and backed with an ICC-ES Listing and Lifetime Transferable Warranty. ICC-ES listings are routinely required by building departments as proof of compliance with the International Building Code and International Residential Code. You can feel safe knowing your foundation is being repaired with certified, permitted, and patented methods. Almost all our repairs end up increasing the value of the home more than the cost of repairs. Contact us today to

The foundation of a house is the most important element of
the structure that requires the highest focus and attention
BECAUSE EVERYTHING YOU OWN SITS ON IT!

An ICC listing means the VR-1 foundation is certified to meet the Residential and International Building Codes which are required by all building departments, engineers, and architects throughout the United States and has a profound effect on the value of the home.

Recommended by92%of homeowners

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BG Construction & Remodeling Inc

4.9(

)

Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Duarte, CA and surrounding areas

In business since 1985

Free estimates

Emergency services offered

"Extremely professional and great work performed by BG construction."

+19

Recommended by100%of homeowners

Basement Drainage Channels - Install

Serving Duarte, CA and surrounding areas

In business since 2007

Free estimates

Credit card accepted

"We had a major water leak After dry out we needed a company to re build our home Armscraft Construction was refereed to us by a company we used for water mitigation We contacted Armscraft and ask them to come out and give us an estimate We got 3 estimates and end up hiring Armscraft Everything went great We are very happy with final results. Will highly recommend to anyone who need help with Construction projects"

+76

Recommended by100%of homeowners

Request Quote

...

Showing 1-10 of 141

Basement Waterproofing FAQs, answered by experts

Some basement waterproofing methods can actually cause your water or moisture problems to get worse, which is why it’s so important to call in a professional who knows how to solve your underlying issue and use the appropriate waterproofing methods. An example of this would be applying latex waterproofing paint to the insides of your basement walls without fixing the water issue outside. Doing so can trap moisture in the basement walls, which can promote mold growth, peeling paint, and even damaged concrete. However, when done by a professional, the only downside to basement waterproofing is the up-front cost.

“Basement waterproofing” sometimes refers to applying a waterproof sealant to basement walls, in which case you would use a waterproof paint, often made of latex. However, there are many methods you can use to waterproof a basement, including exterior drainage systems, interior drainage systems, dehumidifiers, and more. As such, the materials you use can vary depending on the methods you use.

The best basement waterproofing method depends on the specific issue causing the water intrusion. For minor problems, simple solutions like installing a properly functioning gutter system to direct runoff away and grading the soil to slope away from your foundation can be effective.

If you have more significant water problems, the solution will need to be more robust:

For standing water on the basement floor, a floor drain or a sump pump system may be the best solution.
For water pooling around the foundation, installing an exterior French drain can intercept water before it reaches the basement walls.

Other effective waterproofing methods, which can be used depending on your home's specific needs, climate, and soil type, include sealing the interior walls, landscape alteration, installing interior drainage systems, and using a dehumidification system to control moisture levels.

The primary reason homes have crawl spaces is so the foundation can reach down below the frost line to avoid dangerous soil movement and structural damage when the ground freezes. They’re more popular in colder climates where the ground freezes down to a few feet, and slabs are most popular in warmer areas where there is no frost line. Crawl spaces also provide a space for utility lines to run where they’re at less of a risk of freezing.

A sewage smell in your crawl space is usually from a damaged or clogged pipe leaking sewer gasses or actual sewage underneath your home, but there are some other common causes. Moisture, from poor or damaged encapsulation or a malfunctioning sump pump, can harbor mold and bacteria, causing a musty smell. Pests can also get stuck in your crawl space and die, which causes a sewage-like odor.

The Duarte, CA homeowners’ guide to basement waterproofing 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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How to Keep Your Basement Dry and Get Rid of Moisture
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