About Canada Waterproofers: Quality Without Compromise

Lifetime Warranty | Licensed & Insured | Same-Day Estimates

Built on Integrity. Led by Experience. Trusted by Homeowners Across Ontario.

Canada Waterproofers was founded on a simple principle that has guided our work for over 27 years: do the job right, tell people the truth, and stand behind your work.

In an industry where rushed inspections, unnecessary repairs, and sales‑driven recommendations have become common, Canada Waterproofers continues to operate differently. We are an owner‑operated company built on old‑school values—where workmanship, accountability, and reputation matter more than volume.

We specialize in waterproofing, drainage, plumbing, and structural water protection, providing homeowners with solutions that are accurate, durable, and cost‑effective. Every home is different, and we believe every solution must be as well.

At the core of our company are its two owners:
Carl McDowell and Slava Koval.

Owner‑Operated. Personally Accountable.

When you contact Canada Waterproofers, you deal directly with the owners. You will not be evaluated by a sales representative or passed between departments. One of the owners—Carl McDowell or Slava Koval—will personally attend your home to assess the situation.

This approach ensures:

Accurate inspections by experienced professionals
Honest explanations without pressure
Real accountability from diagnosis to completion

Our goal is not to sell work—it is to solve problems properly and permanently.

Experience That Prevents Costly Mistakes

Together, Carl and Slava bring over 30 years of combined hands‑on experience in:

Waterproofing systems
Plumbing and drainage
Foundation and structural water issues
Underpinning and building renovation

They regularly diagnose issues that appear to be “waterproofing problems” but are actually caused by plumbing failures, poor drainage design, foundation movement, or aging infrastructure. This comprehensive understanding allows us to recommend only the work that is truly necessary, saving homeowners thousands of dollars in unnecessary repairs.

Fully Licensed. Highly Credentialed. Provincially Approved.

Carl McDowell and Slava Koval are both:

Master Plumbers
Licensed Waterproofers
Licensed Building Renovators
Underpinning Specialists
Water Damage Restoration Certified Technicians

In addition, Canada Waterproofers is:

A Halton Preferred Contractor
Licensed throughout Ontario for rebate‑eligible work
Fully insured with $5 million in liability coverage

These credentials mean homeowners can trust that their work is performed to professional standards, qualifies for applicable rebate programs, and is fully protected under proper insurance and licensing.

Old‑School Values, Modern Technology

While our values are rooted in traditional craftsmanship and integrity, we utilize modern materials, proven systems, and the latest diagnostic technologies to protect today’s homes.

We believe quality work is not just about what materials are used—but how they are installed, how details are handled, and how a job site is respected. Every home we work on is treated as if it were our own.

Transparent Pricing & Lifetime Protection

Every homeowner receives:

A free, no‑obligation written quote
Clear explanations of recommended work
Honest advice about what does not need to be done

All completed work is backed by a lifetime, fully transferable written warranty, providing long‑term peace of mind and added value to your property.

Built for Today’s Climate and Aging Homes

With changing weather patterns, increased rainfall, and aging infrastructure across Ontario, protecting homes from water damage is more complex than ever. Experience—not guesswork—is essential.

Canada Waterproofers combines decades of real‑world knowledge with modern solutions designed to handle today’s conditions and tomorrow’s challenges.

Carl McDowell

Master Plumber. Licensed Waterproofer. Water Damage Restoration Certified Technician

Carl McDowell is known for his methodical and analytical approach to diagnosing water issues. As a Master Plumber, licensed waterproofer, and water damage restoration certified technician, Carl understands how plumbing systems, drainage, foundations, and structures interact. He focuses on identifying root causes, not surface symptoms. Carl believes homeowners deserve: Clear explanations Honest recommendations Solutions that last His attention to detail and refusal to cut corners have built long‑standing trust with homeowners throughout Ont.

Slava Koval

Master Plumber. Licensed Waterproofer. Licensed building renovator. Certified water damage restoration technician.

Slava Koval is a Master Plumber, licensed waterproofer, licensed building renovator, and certified water damage restoration technician. He takes a hands‑on role in every project, ensuring that installations are completed correctly and to the highest standards. Slava believes true accountability comes from being on site, involved in the work, and standing behind the finished result. Homeowners value his straightforward communication, fair pricing, and commitment to doing only what is necessary—and doing it right.

Owners Who Stand Behind Every Job

If you move forward with Canada Waterproofers, one or both owners will be present on your project, overseeing the work and ensuring it meets the standards their reputation is built on.

Our Commitment

We value our customers, respect their homes, and take pride in every job we complete. Our business is built on referrals, repeat clients, and work that continues to perform years after installation.

If you are looking for integrity, experience, and owner‑led workmanship you can trust, Canada Waterproofers—led by Carl McDowell and Slava Koval—is here for you.

      All reviews
 
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  Excellent5.0505 reviews
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      Posted on Facebook  
   
   Keith Aitken 
 97 days ago
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. I have used them several times for waterproofing on different houses and they are always great. Years ago I recommended them to a friend who was having trouble with his waterproofers, and my friend could not thank me enough. I recently had the pleasure of having them do a plumbing job, and I remembered just how fantastic they are (fair price and great job)

Owner's reply
Thank you so much for this we really appreciate the recommendation.
Hope you have an amazing week 
All the best 
Canada Waterproofers Team
  
 
     Posted on Homestars  
   
   Customer of Canada Waterproofers 
 174 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. They fixed my problem and gave me very helpful advice. The work has been done in an efficient way. The work has been done section by section, and each day when they left the site, they cleaned up everything. The team also find a way to keep and protect my plants in the near the work site.
  
 
     Posted on Homestars  
   
   Dennis 
 175 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Fast and clean service, great job fixing leak in basement walls. Highly recommend.
  
 
     Posted on Homestars  
   
   Customer of Canada Waterproofers 
 330 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Val did a great job. Very friendly and very prompt.

Owner's reply
We’re so happy to hear that Val sorted out the flush and the leak quickly and left you with a great experience. He’ll be delighted to know you found him friendly and prompt – we’ll definitely pass on your kind words! Thanks again for choosing us – we truly appreciate your trust and are here anytime you need us.
  
 
     Posted on Homestars  
   
   Joe 
 370 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. I recently hired Canada Waterproofers to fix a crack in my foundation, and I couldn’t be happier with the results. From start to finish, the experience was smooth and professional. Andrew explained the whole process clearly when he came to provide a quote. Once the job started, they were quick, efficient, and incredibly tidy—leaving absolutely no mess behind. What really impressed me was the transparency throughout the process: they provided clear updates and even shared pictures of each step, which gave me peace of mind and confidence in the quality of the work. I highly recommend them to anyone looking for reliable and thorough foundation repair!

Owner's reply
Thank you so much for your thoughtful review! We’re thrilled to hear that Andrew and the team delivered a smooth, professional experience from start to finish. Our goal is always to provide clear communication, transparency, and top-quality workmanship on every foundation repair project. We really appreciate your trust in Canada Waterproofers and your recommendation — it means a lot to us. Enjoy your dry, worry-free basement! — The Canada Waterproofers Team
  
 
     Posted on Facebook  
   
   Lovish Tayal 
 395 days ago
 
 
 recommendsTrustindex verifies that the original source of the review is Facebook. I took their basement waterproofing services and I must say their team is very knowledgeable, professional and their prices are very affordable. Highly recommend
  
 
     Posted on Homestars  
   
   Customer of Canada Waterproofers 
 408 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Peter is very knowledgeable and reliable. Price is a little higher than others but it is worth the investment. Peter fixed issues that other contractors left behind. Highly recommended for all waterproofing needs.

Owner's reply
Thank you for your kind review! We’re thrilled to hear that Peter’s expertise and reliability made a difference in addressing your sump pump and waterproofing needs. We truly appreciate your trust in us and your recommendation. If you need any further assistance, we’re here to help!
  
 
     Posted on Homestars  
   
   Lek 
 524 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. We were very happy with the service and the quality of work. Val was very professional and knowledgeable. He took time to explain to us what the process would be. He arrived on time and got the work done quickly and professionally. Highly recommend Canada Waterproofers.

Owner's reply
Thank you so much for your kind words and recommendation! We're thrilled to hear you were happy with the service and the quality of work. Val will be especially pleased to know his professionalism and clear communication made a great impression. We truly appreciate your support and trust in Canada Waterproofers!
  
 
     Posted on Homestars  
   
   David 
 605 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. The technician was fantastic! I have placed calls almost annually with other service providers for the same issue. He knew exactly what the issue was on the phone before he arrived. Very professional and knowledgeable, rectified the blockage and tested thoroughly. I will make Canada Waterproofers my go to for future plumbing issues.

Owner's reply
Thanks David So happy we were able to help! It been a pleasure working with you. Thank you so much for choosing Canada Waterproofers Best regards Canada Waterproofers team!
  
 
     Posted on Homestars  
   
   David Olds 
 627 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. I got a call back on the morning after my inquiry and the job was completed later that day. I was very happy with the service and the quality of work. I chose Canada Waterproofers because they had done a job in my basement several years ago and I was happy with that too.

Owner's reply
Thank you David We appreciate your continued support and trust in our company. Thanks so much for choosing Canada Waterproofers. Best regards Canada Waterproofers Team!
  
 
     Posted on Homestars  
   
   HomeOwner 
 637 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Emergency leak
Val was awesome! He was a great communicator letting me know when he would arrive and took the time to explain what happened to my leaking pipe. He did job professionally and saved the day!

Owner's reply
Thanks so much for sharing your experience with us! It's been a pleasure working with you. Hope you have an amazing week ahead. All the best Canada Waterproofers team!
  
 
     Posted on Homestars  
   
   jeffhop_rn 
 649 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Honest, tidy, punctual
Hired for external basement leak waterproofing and some internal plumbing work. Very timely with service from initial call to job completion. Crews were punctual, tidy/clean and worked nonstop. We are very pleased with the service received.

Owner's reply
Thanks Jeff We appreciate your support and business. Thanks for noticing how clean and tidy our crews are, we really try our best to provide the best service possible. All the best! Canada Waterproofers team!
  
 
     Posted on Homestars  
   
   Customer of Canada Waterproofers 
 650 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Sump pump service and waranty
I had replaced my sump pump two months ago. Had Valentine install it. Yesterday, we were noticing a lot of water hammering noise and vibration. So called him today. He promptly responded to my call. Then he dropped by and identified the issue as a defective check valve. And so did the necessary repairs/replacement per our warranty coverage. I am very satisfied with the service and the quick response time. So will definitely call them for other similar projects.

Owner's reply
Thank you for taking the time to share your experience with us. Customer service and satisfaction is our top priority, and we are so happy that we were able to provide you with a good service. Thank you so much for choosing Canada Waterproofers All the best Canada Waterproofers team!
  
 
     Posted on Homestars  
   
   Customer of Canada Waterproofers 
 659 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Good workmanship
Valentyn was fantastic. He worked through my preferred timeline and got the work done quickly and professionally. Will be calling again for other repairs if needed. Highly recommend Canada Waterproofers.

Owner's reply
Thank you so much for your kind words, we really appreciate your support and business. Hope you have an amazing 2025 Bests regards Canada Waterproofers team!
  
 
     Posted on Homestars  
   
   HomeOwner 
 664 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Interior Waterproofing and Sump Pump
From the very beginning, the experience of working with Canada Waterproofers has been fantastic. Andrii was very clear in his communications and answered all my questions, of which there were *many*, as a first-time homeowner. He was very patient and courteous. He communicated clearly with me during the work itself as well, and finished within the promised timeline. The work itself was really neat. The reason I chose this company is because Andrii was the only one to recommend cementing over my useless basement window to prevent leaks. His attention to detail sealed the deal, and I would recommend this company to others!

Owner's reply
Thank you for sharing your fantastic experience with Canada Waterproofers! We're glad you appreciated Andrii's expertise and attention to detail. We appreciate your recommendation and look forward to serving more homeowners like you. Best regards, Canada Waterproofers
  
 
     Posted on Homestars  
   
   Pinky 
 668 days ago
 
 
 Trustindex verifies that the original source of the review is Homestars. Canada Waterproofers answered the call. Had a plumber call to discuss the problem. Arrived on time. It was a very difficult location to work but he replaced it without a problem. Left the area spotlessly clean. I highly recommend them.

Owner's reply
Thank you for taking the time to share your experience with us, we truly appreciate your support and business. It's been a pleasure working with you. Happy holidays! All the best Canada Waterproofers team!
  
 
 
  
 
 
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Water Damage Cost Calculator

See what a single basement flood or ongoing water damage could cost you — versus the price of waterproofing it today.

💧 The average unaddressed basement water damage claim in Ontario costs $43,000+ — often only partially covered by insurance.

Recent Ontario Projects & Tips See how we've helped Ontario homeowners solve their basement water problems with our professional waterproofing solutions.

Does Your Home Insurance Cover Basement Flooding in Ontario? Here’s the Truth After the July 2026 Storm

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TLDR: St. Catharines homes, especially in areas like Old Glenridge, Port Dalhousie, Merritton, and properties near the Welland Canal, Twelve Mile Creek, Lake Ontario, or the Niagara Escarpment, face a…
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TLDR: Etobicoke shoreline homes near Lake Ontario and Etobicoke Creek face elevated risks of basement leaks, foundation cracks, erosion, and sump pump failure due to shallow water tables, saturated soil,…
How to Claim the $6,650 Toronto Basement Subsidy: Expert Installation & Rebate Guide

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North York Foundation Repair: Dealing with Mid-Century Clay Soil & Block Foundations

By Carl McDowell | May 31, 2026

TL;DR North York’s 1950s–70s homes are increasingly failing because their original clay weeping tiles are now 60+ years old, and many were built with hollow block foundations that are more…
7 Mistakes You’re Making with Spring Basement Flood Prevention (and How to Fix Them Before the Next Storm)

By Carl McDowell | May 24, 2026

TL;DR:Spring basement flooding in the GTA is usually caused by preventable maintenance issues, not bad luck. The biggest mistakes homeowners make include ignoring efflorescence (white powder on walls), failing to…
Do You Really Need a Sump Pump Battery Backup? What Burlington and Milton Homeowners Must Know After the 2024 Power Outages?

By Carl McDowell | May 24, 2026

TL;DR:The 2024 storms in Burlington and Milton exposed a major weakness in many homes: sump pumps without battery backup systems. During heavy rainfall and power outages, primary sump pumps stop…
Why Basement Waterproofing Matters: The Truth Behind the 94% Surge in GTA Water Damage Claims

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TL;DR:Water damage claims in the GTA have surged by 94%, with Ontario homeowners filing a record $2.4 billion in claims in 2025 alone. The main reason is the GTA’s clay-heavy…
Backwater Valve Rebates in Mississauga: How to Save While Protecting Your Home

By Carl McDowell | May 24, 2026

TL;DR:Mississauga homeowners face increasing basement flood risks due to overloaded sewer systems during heavy storms. A backwater valve helps stop sewage from backing up into basements by automatically sealing the…
French Drains vs. Surface Grading: Stop Backyard Flooding in Brampton

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TL;DR:Backyard flooding in Brampton is usually caused by dense clay soil that traps water around foundations, creating hydrostatic pressure and increasing the risk of basement leaks. While surface grading can…
Sump Pump Battery Backups: Why 15 Minutes of Power Loss Can Cost $10k

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The “White Powder” Mystery: What Efflorescence Means for Your Foundation

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Milton’s Growing Pains: Why New Builds Need Sump Pump Maintenance

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Sewer Backups: Why Every GTA Home Needs a Backwater Valve

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If you own a home in the Greater Toronto Area, you’ve likely noticed that "unprecedented" storms are becoming an annual tradition. From the historic 2013 floods to the recent flash…
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	Interior	Exterior
Addresses root cause	Manages water inside	✅ Stops water at source
Disruption to yard	✅ None	Excavation required
Disruption to interior	Floor perimeter cut	✅ None
Typical cost	✅ Lower	Higher
Works on finished basements	✅ Yes	✅ Yes
Requires exterior access	✅ No	Yes
Protects foundation membrane	No	✅ Yes
Best for	Managing recurring seepage	Long-term structural protection