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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%
9 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%
12 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

"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! ??
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%
10 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

"Their initial price was really high and I declined. But, when they were left with a crew stuck in my area due to a cancelled job, they were really willing to negotiate. The guys were good and did a good job. I'm really happy I had my slab lifted."
Foundation
Foundation
Foundation
Concrete
Concrete

+16

Response time11 hrs
102 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

As the first layer of water protection for your roof deck and the building materials below, underlayment is designed to prevent water damage, so it’s okay if it gets wet. However, you shouldn’t rely solely on underlayment for protection. If rain interrupts your roof project and you have all of the underlayment down, you’ll likely be fine, but you should install shingles over that layer as soon as possible, as long-term exposure can lead to water damage.

Preventing water accumulation involves regular inspections, maintaining effective drainage systems, ensuring proper roof maintenance, and taking preventive measures against heavy rainfall or floods.

If foundation problems are not fixed, they will likely worsen over time, leading to more complex and expensive repairs. Neglecting a damaged foundation can cause a range of issues, including:

  • Structural Damage: Minor problems like small cracks can escalate into major structural issues. This can damage the house above the foundation and, in severe cases, lead to foundation walls caving in or a total collapse.

  • Water Damage and Pests: Moisture and water intrusion can cause flooding, mold growth, and pest infestations.

  • Health and Safety Risks: Mold can lead to poor indoor air quality and other health risks, while structural instability poses a significant safety hazard.

  • Reduced Home Efficiency: A compromised foundation can negatively impact your home's energy efficiency.

To avoid these escalating problems and costs, it's best to hire a foundation repair company to address any issues as soon as you become aware of them. The earlier problems are discovered and fixed, the lower the repair cost will likely be.

In most cases, yes, because the large majority of basements leak or will have moisture issues at some point, and waterproofing methods can mitigate that risk or eliminate it entirely. Plus, water and moisture issues can be quite problematic, as they can lead to mold growth, rotting of building materials, structural damage, poor indoor air quality, increased electric bills, and other problems.

In nearly all cases, you are required to install a vapor barrier in your crawl space. However, local regulations will change based on the local climate and the crawl space's susceptibility to moisture. Even if a vapor barrier is not legally required, it is often a good idea to keep your crawl space dry.

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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