Best Radon Testing & Mitigation in Toronto

About Radon in Toronto, Ontario

Last updated: March 2026

Toronto's radon risk is lower than in many Canadian cities, as the Greater Toronto Area sits primarily on limestone, shale, and glacial sediments that produce less radon than the granite found in eastern Ontario or the Canadian Shield. That said, individual homes in Toronto can still have elevated levels depending on local soil conditions and construction. Ground-floor units, basement apartments, and older homes with block foundations should be tested. Health Canada recommends testing every Canadian home at least once.

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 28 professionals in Toronto

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

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

Canary Radon Inc.

Toronto, ON

Testing

View Profile

LEGAULT-DUBOIS INC.

La Prairie, QC

4.6(547)Google

LEGAULT-DUBOIS INC. is a C-NRPP certified radon testing professional serving La Prairie, QC and across QC. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(514) 286-0550Call View Profile

Rival Home Inspections

Ajax, ON

5.0(209)Google

Offers radon services. Serves Ajax, ON, Toronto, Durham, York, Peel, Halton, Simcoe, Brant, Dufferin, Kawartha Lakes, Hamilton, Waterloo, Peterborough, and all GTA Regions.

Testing

(905) 922-5437Call View Profile

Custom Build Standard Construction Corp.

Richmond Hill, ON

Full-service construction company specializing in custom homes, multiplexes, and renovations. Offers framing, structural steel, insulation, and drywall services in Toronto & the GTA.

Testing

(416) 901-6020Call View Profile

Energy Home Service Corp.

Vaughan, ON

Energy Home Service Corp. is a C-NRPP certified radon testing professional serving Vaughan, ON and across ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(647) 291-1646Call View Profile

Geosyntec Consultants

Guelph, ON

5.0(1)Google

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

TestingMitigation

(519) 515-0886Call 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

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

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

RadonClean

Markham, ON

Provides DIY and official radon measurement, testing, and mitigation system installation. Services offered for homeowners, real estate, and new built houses.

TestingMitigation

(416) 898-8127Call View Profile

Local radon data

How common is high radon in Toronto?

Lower

1 in 59

homes tested in the Toronto 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.

Toronto

1 in 59

Ontario

1 in 7.6

Canada

1 in 5.6

Postal areas nearby with the highest estimates

256 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 Toronto on the radon map

Test before you call a pro

Know your radon level in Toronto 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 Toronto

Toronto's overall radon risk is lower than cities like Ottawa or Kingston, which sit closer to Canadian Shield geology. However, individual homes anywhere in Toronto can have elevated radon depending on local conditions and foundation type. Health Canada recommends testing all Canadian homes regardless of location.

Most Toronto homeowners pay between $1,800 and $3,200 for a complete active sub-slab depressurization system. GTA labour rates are competitive. Finished basements or more complex configurations tend toward the higher end.

Units on upper floors of high-rise condos are generally at low risk. Ground-floor units and basement suites are more susceptible. Townhouse-style condos with basements should always be tested. If your unit is on the second floor or higher in a concrete high-rise, radon is unlikely to be a significant concern.

Browse the listings above to find C-NRPP certified radon professionals serving Toronto and the GTA. All professionals listed on RadonFinder.ca hold current C-NRPP certification.