About INSITU Contractors

INSITU Contractors is your groundwater control specialist with over 1400 projects completed in Ontario and beyond.

Our History

INSITU Contractors was established in 1994 by Harry Oussoren and has since successfully completed 1400+ projects in Ontario and beyond.

The success of these projects is built on a sound technical understanding of groundwater conditions and many years of experience providing practical solutions to groundwater issues. 

Our company name originates from the Latin word meaning “In It’s Original Place” and is a literal representation of the work that we do.

Our History


INSITU Contractors created by Harry Oussoren
First project at the Holloway Mine in Kirkland Lake
Construction of TTC Sheppard Subway in Toronto, Ontario
First Groundwater Treatment Project in North Bay, Ontario
First international project in the Philippines
First project in the United States in Cleveland, Ohio
Moved to new 7500 sq ft facility in Guelph, Ontario
First project outside of Ontario, in Alberta, Canada
Completed major oil spill cleanup in Downtown Toronto
Eglinton LRT Tunnel Works begins in Toronto, Ontario
Moved to new 11,000 sq ft facility in Guelph, Ontario
Eglinton LRT Station Works begins in Toronto, Ontario
Welcomed Underground Sonic Drilling Services to the Insitu Family
Opened second office in Orillia, Ontario

INSITU Contractors has Completed Over 1400 Projects Across Canada

Why Hire INSITU Contractors

INSITU Contractors Team Is Experienced, Technical and Reliable

28+ Years in Business

  • Have over 100 years of local staff experience in geotechnical, hydrogeological, site remediation design and contracting throughout Southern Ontario and across Canada. 
  • Are professional engineers certified in Ontario and British Columbia
  • Is a Licensed water well contractor
  • Design and manufacture vacuum wellpoint pumps and peripheral equipment
28+ Years in Business

Superior Technical Expertise

  • We are driven by our passion to find a technically sound solution for our clients, not by sales
  • We have in-house engineering staff 
  • We employ 15+ licensed well technicians 
  • Our pumping equipment is the newest and most efficient on the market in today’s green world
Superior Technical Expertise

All-In-One Advantage

  • We’ve completed 1400+ projects in Southern Ontario
  • All-in-one solutions – we will support our clients from the investigation stage all the way through design, construction and post-construction. We provide a full service that includes installation and maintenance without hidden fees
All-In-One Advantage

Meet Our Team

Our in-house team consists of engineering staff, well technicians, and office admin staff who are all committed to the success of your project.

Our Values

INSITU Contractors is driven by Values rather than by Sales

Safety First

We are certified under the COR safety program. Our teams focus on the safety of everyone on site using strict procedures.

We Are Human

  • We’re the face of the franchise. We don’t hide behind our staff; when needed we talk to customers during the sales and work process.
  • We don’t wear suits to the office. We’re not stuck on roles.
  • We don’t yell and scream at people, instead, we prefer resolving problems collaboratively.

We Listen

Too often clients are offered a solution without an in-depth consideration of the project. At INSITU, we ask the question – ‘what do you need from us?’. We don’t sell what isn’t needed.

We Are Respectful

  • We are committed to the clients from start to finish. We’ll stay until the job is done.
  • Our goal is to make every client feel like they’re our only client.
  • We treat our clients how we want to be treated, with respect and integrity.

We Innovate & Customize

We’re constantly developing new techniques to get better and more efficient at what we do. After completing 1400+ projects we are confident there’s a solution to every groundwater problem.

We Learn & Teach

Insitu offers technical in-person seminars where we teach companies or municipal inspectors how dewatering works. If you’d like to invite us to speak at your organization please contact us below.

We Are Environmentally Sustainable

We use electric pumps or fuel-efficient Diesel pumps. We strive to make our impact on the environment as minimal as possible.

Groundwater Control Services

We offer All-In-One-Solution – from engineering consultancy to Done-For-You dewatering services

Our Affiliations

We’re Members Of

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Please Contact Us For Help With Your Project