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Verified Reviews for Basement Waterproofing pros in Pomona, CA

*The Angi rating for Basement Waterproofing companies in Pomona, 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 Pomona, 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 January 27, 2026

Find Basement waterproofing pros in Pomona

Avatar for 21st Century Waterproofing
21st Century Waterproofing
4.8(
30
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Pomona, CA and surrounding areas

Approved

In business since 1992

Free estimates

Small jobs welcome

"Bill and his crew were extremely professional and helped assess the issue and fix my waterproofing problems quickly. Highly recommend."
Response time1 day
Response rate88%
8 neighbors recently requested a quote
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Avatar for Alpha Structural, Inc.
Alpha Structural, Inc.
4.6(
241
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Pomona, CA and surrounding areas

Approved (Corporate)

In business since 1992

Free estimates

Emergency services offered

"Incredibly knowledgeable and trustworthy. Errin gave us a clear understanding concerning our foundation, deck and balcony needs. He was friendly and professional and easy to work with. Great experienced staff!"
Basement Addition
Basement Expansion
Caisson Supported Retaining Wall
Cantilevered Deck Design Build
Deck Expansion and Slope Failure with Retaining Wall

+323

Response time10 hrs
Response rate100%
11 neighbors recently requested a quote
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Avatar for Western Rooter & Plumbing
Western Rooter & Plumbing
4.8(
171
)
Basement Drainage Channels - Install

Serving Pomona, CA and surrounding areas

Approved

In business since 1981

Free estimates

Emergency services offered

"The repair guy came within the estimated time and resolved my water heater issue, no charge."
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! ??
Sewer Line Camera
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%
11 neighbors recently requested a quote
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Avatar for Groundworks
Groundworks
3.5(
176
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Pomona, CA and surrounding areas

Approved (Corporate)

In business since 1995

Free estimates

Warranties offered

"Angel and Andrew did a great job on raising the concrete on my patio. One side was sinking which caused the other side to lift up. They were able to even out the cement so now it looks great. Thank you for working so hard to fix it."
Foundation
Foundation
Foundation
Concrete
Concrete

+16

Response time11 hrs
96 neighbors recently requested a quote
Recommended by38%of homeowners
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Avatar for Regal Plumbing & Rooter
Regal Plumbing & Rooter
5.0(
7
)
Basement Drainage Channels - Install

Serving Pomona, CA and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"Nick was amazing and got a big problem done for a reasonable price. He will be my forever plumber now"
Gas line install for space heaters in backyard
Gas line install for space heaters in backyard
Plumbing Project
Gas line install for space heaters in backyard
Plumbing Project

+100

Response time6 hrs
2 neighbors recently requested a quote
Recommended by71%of homeowners
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RSF Construction Inc.
1.0(
1
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Pomona, 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 Pomona, 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(
90
)
Foundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Pomona, 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
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Avatar for Reliable Roofing
Reliable Roofing
4.9(
614
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Pomona, 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."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+290

Recommended by85%of homeowners
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Basement Waterproofing questions, answered by experts

Generally, moisture barrier padding costs $0.75 to $1.50 per square foot, varying by brand and mix. That’s a lot more than standard padding, which runs $0.25 to $0.90 per square foot. The price difference between these two options might seem steep, but think of it as insurance against future carpet replacement costs and subfloor damage. If you have pets or kids, that extra investment in high-risk areas like your living room often pays off.

A walkout basement is considered to be partially below grade because at least one wall is entirely exposed. In some cases and in specific municipalities, inspectors and appraisers will still count walkout basements as below grade, which means the space can’t serve as living space or be rented out. If you intend on using the area as living space or a separate apartment, you should check with your local building department to make sure it’s legal to do so.

You’ll need to reseal the foundation every five to 10 years, depending on the sealant you’ve used, the moisture conditions present in and around your home, and the condition of your foundation. Having a foundation inspection conducted before reapplication can help you catch any problems before you begin resealing. Of course, if you notice any new leaks or other moisture problems at any time, it may be necessary to reseal the foundation sooner.

Yes. Water can penetrate through a concrete foundation wall. This can happen whether or not you have cracks, as concrete is a porous material. You’ll want to take steps to waterproof your basement or crawl space.

Water damage always poses a primary risk of mold and mildew, but growth is not guaranteed. The chances of mold developing depend on several factors, including the severity of the damage and how quickly the area is cleaned and dried. To prevent mold, you must act quickly—ideally within the first 24 hours. Clean up all water and thoroughly dry the affected area. If the damage is extensive, you were unable to address it immediately, or you suspect mold has already started to grow, it is best to assume it is present and hire a professional mold inspector or removal expert to assess the situation.

The Pomona, CA homeowners’ guide to basement waterproofing services

From average costs to expert advice, get all the answers you need to get your job done.

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