Best Radon Testing & Mitigation in St. Catharines

About Radon in St. Catharines, Ontario

Last updated: March 2026

St. Catharines is served by C-NRPP certified radon professionals listed on RadonFinder.ca. Ontario has widely varying radon risk depending on geography. The Ottawa Valley, eastern Ontario, and areas underlain by the Canadian Shield — including parts of Sudbury, Elliot Lake, and the Bancroft region — have elevated radon due to uranium-rich granite bedrock. Southern Ontario's clay and limestone geology generally produces lower levels, though local hotspots exist in any region. Health Canada estimates roughly 7% of Ontario homes exceed the guideline.

Typical Mitigation Cost in Ontario

$1,800–$3,200

Near national average

Costs vary significantly between the GTA, Ottawa, and northern Ontario due to labour markets and home construction types.

  • •Foundation type — poured concrete, block, or slab
  • •Basement finish level — unfinished installs are faster and cheaper
  • •Pipe routing complexity in finished or split-level homes
  • •GTA vs. rural Ontario labour rate differences
  • •Age of home — older homes may require additional sealing work

Showing 1–12 of 12 professionals in St. Catharines

Matthew Regehr

St. Catharines, ON
Basic
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Expert Plumbing and Drains Inc

Burlington, ON
Basic
5.0(183)Google

A full-service plumbing and drain company offering heating and radon services. Brings over 80 years of combined experience to homeowners and custom home builders.

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Radiation Safety Institute of Canada, National Laboratories

Toronto, ON
Basic
3.6(7)Google

Provides radon testing and CRM calibration services. Features a radon chamber and offers comprehensive radiation safety education.

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The Bearstar Group Inc

North York, ON
Basic
4.3(6)Google

Offers hazardous material abatement services including radon solutions for commercial, industrial, and institutional buildings. Provides identification, removal, and disposal with 25+ years expertise.

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Martech Group Inc.

Mississauga, ON
Basic
4.9(19)Google
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Canada Post

Mississauga, ON
Basic
2.2(182)Google
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Borts Home and Energy

Etobicoke, ON
Basic
4.8(237)Google
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WSP Canada

Etobicoke, ON
Basic
4.8(12)Google
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ECOH Management Inc.

Toronto, ON
Basic
4.9(7)Google
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ECOH

Mississauga, ON
Basic
4.9(7)Google
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Radon PI

Dundas, Ancaster, Burlington, ON
Basic
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Daniel Jennings

Stoney Creek, ON
Basic
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Frequently Asked Questions: Radon in St. Catharines

RadonFinder.ca lists C-NRPP certified radon testing and mitigation professionals serving St. Catharines, Ontario. Browse the directory above to compare professionals by services offered, certifications, and reviews.
Most homeowners in Ontario pay between $1,800 and $3,200 for a complete radon mitigation system. Actual cost depends on your foundation type, home size, and the complexity of the installation. Request quotes from multiple professionals to compare.
St. Catharines follows Health Canada’s national guideline of 200 Bq/m³. If your home tests above this level, Health Canada recommends taking action to reduce radon — within two years for levels between 200 and 600 Bq/m³, and within one year if above 600 Bq/m³.
Yes. Health Canada recommends testing every home in Canada, regardless of age, construction type, or location. Radon levels vary from house to house — even neighbouring homes can have very different readings. A long-term test of at least 91 days during the heating season is the most reliable method.
The most common system is active sub-slab depressurization (ASD). A certified professional installs a pipe through your foundation slab connected to a fan that draws radon from beneath the home and vents it safely above the roofline. Installation typically takes one day.

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Radon Resources for St. Catharines

Tools and guides to help you understand radon risk and take action.

Check your radon risk
Estimate your risk based on province, home age, and foundation type.
Understand your test results
Learn what Bq/m³ means and when action is required.
DIY radon test kits
Compare test kit options starting from $10.
Radon guides & articles
In-depth guides on testing, mitigation, and health risk.
Browse all provinces
Find certified professionals anywhere in Canada.
Radon FAQ
Answers to the most common questions about radon.