Top-rated basement waterproofing pros.

Get matched with top basement waterproofing pros in Union Gap, WA

Enter your zip and get matched with up to 5 pros

Need a pro for your basement waterproofing project in Union Gap, WA?

Select your specific project to find the pro for you.

Verified Reviews for Basement Waterproofing pros in Union Gap, WA

*The Angi rating for Basement Waterproofing companies in Union Gap, WA 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 Union Gap, WA 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 February 17, 2026

Find Basement waterproofing pros in Union Gap

Avatar for TerraFirma
TerraFirma
4.1(
100
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"I was please with the estimator, Boston's knowledge and willingness to walk me through the process and unfamiliar territory of basement waterproofing. He was very knowledgeable and answers so many questions, at the time of the walk through as well as in the days after when I had questions after receiving other bids and trying to compare them. In the end, it was just my low budget that kept me from going with Terra Firma. I thought their system was excellent, and would have worked well with my basement, but I had to opt for a less expensive design."
A System Design Specialist helping a homeowner
Encapsulating a crawl space
Fleet of vehicles in our Portland, Oregon locatio
Loading up our truck for a piering job
Loading up a truck for a waterproofing job

+33

Response time10 mins
Response rate100%
120 neighbors recently requested a quote
Request Quote
Avatar for MTU Services LLC
MTU Services LLC
5.0(
5
)
Foundation, Basement or Crawlspace - Waterproofing / EncapsulationBasement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"We’ve had a lot of crews in our home for various projects over the years, and I have to say this was one of the most courteous. They worked hard, navigating through our kitchen to access the basement and I really appreciated their efforts. Thank you MTU, we now have safe walls in our cellar and fresh beams to keep the house standing ;)"
Elevator pit waterproofing and sealing
Piers under an existing home
Piers under an existing homes middle wall
Solutions/Answers
Response time1 day
Response rate100%
5 neighbors recently requested a quote
Request Quote
Avatar for Campbell & Company
Campbell & Company
4.6(
165
)
Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved (Corporate)

In business since 1983

Free estimates

Credit card accepted

HEATING, COOLING, ELECTRICAL, SOLAR, PLUMBING, AND\nDRAIN SERVICES IN THE TRI-CITIES & YAKIMA, WA\nSpeedy Response - Expertise and Experience - Efficient Troubleshooting - Quality Workmanship - Transparent Pricing - Excellent Customer Service\n\nAre you facing an HVAC breakdown, a plumbing emergency, electrical issues, or considering a solar energy upgrade? Look no further! We are your trusted experts in HVAC, plumbing, electrical repairs, generator needs and solar energy solutions, and we're here to solve your problems swiftly and efficiently.

43 neighbors recently requested a quote
Recommended by88%of homeowners
Request Quote
Avatar for Mr. Rooter Plumbing
Mr. Rooter Plumbing
4.6(
5
)
Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 1997

Free estimates

Emergency services offered

Thank you for considering hiring us for your project! At Mr. Rooter Plumbing we pride ourselves on quality work, integrity and competitive pricing. We believe in giving our absolute best, no matter how big or small your project.\nWe are experts in our trade, and we will keep you educated and informed throughout the completion of your project. We treat your property like it's our own, with the utmost respect, just like we would our own family!\nAs the owner, my aim is to earn a 5-star review on the completion of your project. So, please let me know if at any time we are not living up to earning your perfect 5-star review.\nWe look forward to earning your business, so please ask us for references!

Plumbing
Response time8 hrs
Response rate100%
9 neighbors recently requested a quote
Request Quote
Avatar for Bedrock Excavation and General Contracting LLC
Bedrock Excavation and General Contracting LLC
New to Angi
Basement Drainage Channels - InstallBasement Drainage Channels - Repair

Serving Union Gap, WA and surrounding areas

Approved

In business since 2025

Free estimates

Small jobs welcome

Pride ourselves with quick quality work with honest prices

Gallery
Gallery
Gallery
Gallery
9 neighbors recently requested a quote
Request Quote
Avatar for TerraFirma Foundation Systems
TerraFirma Foundation Systems
4.4(
238
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 2005

Free estimates

Emergency services offered

"I used TerraFirma to install a sump pump in my leaking basement. The team that worked on installation were great to work with. I was very pleased with the quality of work, the communication throughout the process, and their respect for my home."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+11

Response time7 hrs
Response rate100%
Recommended by89%of homeowners
Request Quote
Avatar for State Wide Contracting
State Wide Contracting
5.0(
11
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 2011

Free estimates

Emergency services offered

"Went great, Contractor found poor construction with existing windows and fixed the issue when installing new windows."
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+25

Recommended by100%of homeowners
Request Quote
Avatar for Hampton Enterprise LLC
Hampton Enterprise LLC
3.7(
9
)
Basement Drainage Channels - InstallBasement Drainage Channels - RepairFoundation, Basement or Crawlspace - Waterproofing / Encapsulation

Serving Union Gap, WA and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"They did a very good job. They were quick and I am very happy with the work that they did for me."
Additional Photos
Additional Photos
Recommended by60%of homeowners
Request Quote
Showing 1-10 of 23
Basement Waterproofing questions, answered by experts

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.

Water damage always poses a primary risk of mold and mildew, but growth is not guaranteed. Whether mold develops depends on several factors, including the severity of the water damage and how quickly the area is addressed. To prevent mold, you must act fast—ideally within the first 24 hours. The process involves cleaning up all standing water and thoroughly drying the affected area. If the damage is extensive, the cleanup was delayed, or you suspect mold might be present, it is safest to assume it has grown and contact a professional mold inspector or removal expert to assess the situation.

Some disadvantages of crawl spaces are mostly regarding the air itself—moisture build-up and poor ventilation, which can cause problems both in the house and underneath it, even damaging the foundation itself. Crawl spaces are difficult to access and often invite unwanted pests during the hot summer months and the cold winter ones. These hard-to-seal spaces are also susceptible to water damage during periods of heavy rain or melting snow.

Yes, it is generally unhealthy and can be dangerous to live in a damp basement. The damp air can negatively affect your breathing and lungs, and the moisture promotes mold growth and pest infestations. Inhaling mold spores or waste particles from insects and rodents attracted to the moisture can be hazardous. This damp, moldy air can also circulate into your main living area. It is crucial to resolve any moisture problems and implement preventative measures before using your basement as a living space.

There are several small, inexpensive upgrades you can make to upgrade your basement. Although you still need to adhere to building codes and obtain permits when necessary, you can complete small but mighty tasks like painting the masonry walls and installing entertainment devices to make the space more usable. 

The Union Gap, WA 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