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. The 2024 Cross-Canada survey found about 13% of Ontario homes exceed the guideline.

Typical Mitigation Cost in Ontario

$2,200–$3,800

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 1–16 of 17 professionals in St. Catharines

Matthew Regehr

St. Catharines, ON

Matthew Regehr is a C-NRPP certified radon testing professional serving St. Catharines, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(289) 668-9077Call View Profile

Borts Home and Energy

Etobicoke, ON

4.8(292)Google

Borts Home and Energy is a C-NRPP certified radon testing and mitigation professional serving Etobicoke, ON. They offer complete radon solutions from initial testing through to mitigation system installation.

TestingMitigation

(416) 880-7620Call View Profile

The Bearstar Group Inc

North York, ON

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.

TestingMitigation

(905) 484-9798Call View Profile

Expert Plumbing and Drains Inc

Burlington, ON

5.0(222)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.

Testing

(905) 531-4111Call View Profile

ECOH Management Inc.

Toronto, ON

5.0(6)Google

ECOH Management Inc. is a C-NRPP certified radon testing professional serving Toronto, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(416) 786-9746Call View Profile

Canada Post

Mississauga, ON

2.2(191)Google

Canada Post is a C-NRPP certified radon testing professional serving Mississauga, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(416) 909-6969Call View Profile

WSP Canada

Etobicoke, ON

4.8(12)Google

WSP Canada is a C-NRPP certified radon testing and mitigation professional serving Etobicoke, ON. They offer complete radon solutions from initial testing through to mitigation system installation.

TestingMitigation

(647) 299-6692Call View Profile

Radiation Safety Institute of Canada, National Laboratories

Toronto, ON

3.8(8)Google

The Radiation Safety Institute of Canada's National Laboratories in Toronto offer radiation safety training and lab services. For radon, it runs a radon chamber and CRM calibration for professionals and no longer offers home radon testing to the public.

Testing

(416) 650-9090Call View Profile

ECOH

Mississauga, ON

5.0(6)Google

ECOH is a C-NRPP certified radon testing professional serving Mississauga, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(905) 795-2800Call View Profile

Martech Group Inc.

Mississauga, ON

5.0(21)Google

Martech Group Inc. is a C-NRPP certified radon testing professional serving Mississauga, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(416) 801-0593Call View Profile

Radon PI

Dundas, Ancaster, Burlington, ON

Radon PI is a C-NRPP certified radon testing and mitigation professional serving Dundas, Ancaster, Burlington, ON. They offer complete radon solutions from initial testing through to mitigation system installation.

TestingMitigation

(905) 979-3277Call View Profile

Daniel Jennings

Stoney Creek, ON

Daniel Jennings is a C-NRPP certified radon testing professional serving Stoney Creek, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(289) 456-1023Call View Profile

The Radon Man

Hamilton, ON

The Radon Man is a Hamilton-based C-NRPP certified contractor who tests homes for radon, diagnoses entry points and installs and verifies mitigation systems. He serves Hamilton, Ancaster, Dundas, Stoney Creek, Burlington, Grimsby, Oakville and Niagara.

MitigationTesting

View Profile

Canary Radon Inc.

Toronto, ON

Testing

View Profile

RadonRx

Ancaster, ON

Testing

View Profile

Canadensis Green Consulting Ltd.

East York, ON

TestingMitigation

View Profile

Local radon data

How common is high radon in St. Catharines?

Moderate

1 in 6

homes tested in the St. Catharines area had radon above Health Canada's action level of 200 Bq/m³. Your home can be very different from its neighbours, so the only way to know your level is to test.

St. Catharines

1 in 6

Ontario

1 in 7.6

Canada

1 in 5.6

Postal areas nearby with the highest estimates

26 homes tested in the 2024 Cross-Canada survey. Source: the RadonFinder.ca radon map of Canada, built on the 2024 Cross-Canada survey, Health Canada data and Statistics Canada census data.

Open St. Catharines on the radon map

Test before you call a pro

Know your radon level in St. Catharines first

A home monitor tells you whether you need mitigation at all, and later confirms it worked. Health Canada bases decisions on a 3-month average, ideally through winter.

Best Overall

Airthings Corentium Home

~$170–190 CAD C-NRPP tested

View on Amazon.ca

Newest Model

Airthings Corentium Home 2

~$230–250 CAD

View on Amazon.ca

Compare all detectors · As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.

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 $2,200 and $3,800 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 and 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.