Crawl Space Drainage

At Northwest Crawl Space Services, we understand the critical importance of maintaining a dry and structurally sound crawl space within your home. Far more than just an inconvenience, water accumulation in this area can lead to significant damage, surpassing even the destructive potential of rodents. Left unchecked, standing water poses a serious risk, fostering mold growth and jeopardizing the integrity of your entire foundation, often resulting in costly repairs.

Our specialized expertise lies in the installation and meticulous maintenance of advanced crawl space drainage systems. Combining modern drains with sump pump technology, our solutions are tailored to effectively divert ground water away from your crawl space, ensuring its long-term protection and preserving the integrity of your home.

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Common Reasons for Rain or Ground Water in Your Crawl Space

Poor Drainage

Inadequate grading around the perimeter of your home can lead to water pooling near the foundation, increasing the risk of water seepage into the crawl space.

Leaking Gutters or Downspouts

Damaged or clogged gutters and downspouts can cause rainwater to overflow and collect near the foundation, ultimately finding its way into the crawl space.

Hydrostatic Pressure

During heavy rainfall or periods of high groundwater levels, hydrostatic pressure can build up around the foundation, forcing water through cracks or gaps and into the crawl space.

High Water Table

In areas with a high water table, the natural level of groundwater may rise close to or above the level of the crawl space, increasing the likelihood of water entering the space through the ground or foundation walls.

The Hazards of Standing Water in Your Crawl Space

Mold Growth

Standing water creates a damp environment ideal for mold growth. Mold not only damages building materials but also releases spores that can cause respiratory issues and allergies.

Structural Damage

Prolonged exposure to moisture weakens wooden supports and can lead to structural damage in your home's foundation, floors, and walls.

Wood-Destroying Organism Infestation

Standing water in your crawl space attracts wood-destroying organisms such as termites, carpenter ants, and wood-boring beetles, which thrive in moist environments. These pests can cause significant structural damage to your home by feeding on wooden components.

Odors and Indoor Air Quality

Stagnant water emits foul odors and contributes to poor indoor air quality, leading to discomfort and potential health problems for occupants.

Electrical Hazards

If water comes into contact with electrical wiring or appliances in the crawl space, it poses a risk of electrical shock and fire.

Increased Energy Costs

Moisture in the crawl space can lead to higher humidity levels throughout your home, making it more challenging and expensive to regulate indoor temperatures.

Our Streamlined Process for Crawl Space Drainage

French Drain Installation
  • We excavate a trench along the inner foundation wall.
  • Drain rock and a perforated pipe are laid in the trench to facilitate drainage.
  • A hole is dug to accommodate the basin.
  • We install the basin, lid, and filtration system to effectively capture and filter water.
  • Our team installs the sump pump and check valve to ensure efficient water removal.
  • Additionally, we incorporate a flood alarm system for added security.

*Additional option includes a dual sump pump setup, featuring a secondary pump and battery for backup.

  • Using a PVC pipe, we direct water away from the crawl space.
  • Discharge destinations include directing water towards the street, slope, or existing drain.

We ensure a dry crawl space. no standing water – guaranteed. If water is detected within the warranty period, we promptly return to address the issue and perform any necessary additional work.

Furthermore, we provide emergency response services in the event of a system failure leading to a flood, with our team arriving within hours.

For added security, we install alarm system along with our sump pump. This alarm will alert you to any system failure, allowing you to inform us immediately. Our dedicated team is ready to handle it swiftly and efficiently. Your peace of mind is our priority.

As part of our Annual Maintenance Program, we conduct a thorough yearly visit to ensure your crawl space remains water-free. Our team checks for any puddling, inspects, and tests the system, cleans the basin and the pump, and ensures its functionality for the upcoming year.

*Our annual visit ensures your 10-year warranty stays active, with a set fee of $129.

Hire a certified electrician to Install a dual GFCI outlet directly above the sump pump for a seamless, cord-free connection. It is strongly advised to designate a dedicated circuit for this outlet to prevent overload and power break.

If electrical setup has not been completed prior to installation, we will temporarily connect the sump pump with extension cord to an available existing outlet.


Northwest Crawl Space Services is family-owned right here in the Pacific Northwest. With years of experience, we’re licensed and bonded and always prioritize our customer’s satisfaction. Please read some of our 5-star reviews from our happy customers.

Myong Soo Kim
Myong Soo Kim
9 March 2023
Exceed their promises..excellent communication and great crew. Highly recommend.
Thomas Roberts
Thomas Roberts
9 March 2023
Rob and crew from NW Crawl Space did full remediation for our crawl space and attic, after finding evidence of rodents (mice) in both areas. Removed old crawl space insulation & vapor barrier, replaced heat-ducts that were damaged, & vacuumed out attic insulation and debris. Sealed openings in both areas to prevent rodents from returning. Traps set, with rodent control plan. Highly recommended!
Emily Davis
Emily Davis
3 March 2023
Northwest Crawl Space Services has been honest, professional, easy to work with, and has done excellent work on my home. I first approached the company looking for someone to reinsulate and clean out my mud room crawlspace-- it is an addition to the house and is open-air. Lior came by and noted that because NWCSS specializes in fiberglass insulation, they wouldn't be able to work on this part of my house, because it would require spray foam insulation to truly be rat and weather proofed. I really appreciated this up front honesty-- two previous contractors had given me bids to reinsulate with fiberglass, never mentioning the need for spray foam, and never saying that they wouldn't be able to do a proper job. I would have paid money to some other company for a shoddy, inappropriate "solution" if Lior had not filled me in. Lior even recommended some other companies to call that specialize in spray foam! After this helpful and informative experience, I knew right away when I discovered signs of rats in my main basement crawlspace that I wanted NWCSS to be the ones to work on the problem. Lior came by to check it out and did a very thorough inspection. His manner with clients is excellent-- I never felt like my questions were being dismissed. We set a date for a crew to come by to replace rat-infested insulation, remove the improperly installed vapor barrier, clean out debris, and reinstall vapor barrier to industry standards. The crew, Patrick and Chandler, were friendly, polite, and happy to answer questions. Savannah in the office has also been very friendly and quick to answer my questions regarding logistics and payment. Overall, my experience was excellent and I will re-hire NWCSS when it comes time to reinsulate and clean out my attic crawlspace.
jan ostrovsky
jan ostrovsky
6 February 2023
Matan gave us a fair estimate for the crawl space re-insulation and screening, and the work was done promptly. I was pleasantly surprised when the final bill came in about 15% UNDER the estimate. It’s nice to deal with a company which has the integrity to pass those savings on.
Dan Huang
Dan Huang
26 January 2023
Northwest Crawl Space is a trustful company to work with. They helped me install the French drain, replace the insulation and vapor barrier. Matan and his stuff did a great job. They will carefully protect your home when performing the job, clean the waste after the work is done, and come back to inspect if the work is good.
Scott Taylor
Scott Taylor
17 December 2022
We had Northwest crawlspace come out to inspect our crawlspace and they identify a lot of standing water as well as rodent activity in the insulation. As a result, we needed a full clean out of our crawlspace and new insulation, vapor barrier, drain and sump pump. The crew was professional, friendly and fast. The work was extremely well done, we recently had them come out to check everything and the technician confirmed it was one of the best installs he had seen. I would highly recommend this company to anyone.
Ricardo Salvatierra
Ricardo Salvatierra
16 December 2022
My experience with this company has been amazing. Lior (the owner) goes above and beyon every single aspect, super professional and always providing the best advice to avoid unnecessary expenses. They did the whole work in my crawlspace, sump pump, french drain, vapor barrier, etc... and results are great, 0 moisture. I would definitely recommend it.
Torrey Olsen
Torrey Olsen
15 December 2022
Lior and his NW Crawl Space Services team were everything we expected in professionals! They were on time, neat, though, communicative, polite, did the job as promised and then checked back with us as promised again to ensure that the job was done!
Wayne Appler
Wayne Appler
18 November 2022
I had Northwest Crawl Space Services remove all my rodent infested insulation and vapor barrier. They cleaned & disinfected my crawl and installed all new insulation and a sealed vapor barrier. The workers were very diligent and and skilled in their methods. I was given a quote up front and feel that I received a quality job that was worth every penny. I am beyond pleased with the company and would highly recommend them to everyone.

Frequently asked questions

Is a crawl space drainage system necessary if there's only a small amount of water present?

Even small amounts of water in the crawl space can lead to moisture issues, mold growth, and structural damage over time. Installing a drainage system can help prevent these problems and maintain a dry and healthy crawl space environment. It’s important to address any water intrusion promptly to avoid potential long-term consequences.

Several factors could contribute to this sudden occurrence. It’s possible that changes in weather patterns, such as heavy rainfall or melting snow, have led to increased water infiltration. Additionally, shifts in the water table level, which can vary from year to year, may result in water entering your crawl space. Aging drainage systems or shifts in the soil around your home’s foundation could also play a role.

The installation time for crawl space drainage systems varies based on factors like the size of the crawl space and the complexity of the drainage system. For an average-sized house, installation usually takes between 1 to 2 days. Our team can provide a more precise estimate after evaluating your specific requirements.

Signs such as musty odors, visible moisture, or water damage in the crawl space indicate a need for drainage solutions. Regular inspections can also help identify potential issues early.

While DIY installation may seem feasible, it’s best to hire a professional for optimal results. Our team has the expertise and equipment to ensure proper installation and long-term effectiveness of the drainage system.

Crawl space drainage is crucial for preventing water accumulation, which can lead to mold growth, structural damage, and other costly issues in your home.

Get Your Free Quote

Fill out this form and we will contact you within 24 hours.