Best Radon Testing & Mitigation in Ottawa

About Radon in Ottawa, Ontario

Last updated: March 2026

Ottawa 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 30 professionals in Ottawa

Radon Pros Canada Inc.

Ottawa, ON

Verified

5.0(14)Google

At Radon Pros Canada we are dedicated to protecting the health and safety of your home and family from the dangers of radon. With a commitment to excellence, we pride ourselves on the quality of our work and the exceptional service we provide.

TestingMitigation

(613) 800-4616Call View Profile

Barrhaven Home Inspectors, Inc

Ottawa, ON

4.7(45)Google

Barrhaven Home Inspectors is an Ottawa home inspection company that offers resale and Tarion new-home inspections, plus indoor air quality, mould, sewer camera and radon testing services. Neil Card serves Barrhaven and the greater Ottawa area.

Testing

(613) 823-8844Call View Profile

Paterson Group Inc.

Ottawa, ON

4.0(13)Google

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

Testing

(613) 913-3608Call View Profile

Radon Hero

Ottawa, ON

5.0(25)Google

C-NRPP certified professional radon testing & mitigation services in Ottawa. Offers a risk-free guarantee: don't pay until radon levels are below 100 Bq/m³.

TestingMitigation

(613) 807-4910Call View Profile

Buller Crichton Environmental Inc.

Ottawa, ON

5.0(5)Google

Health and safety consultants. Offers radon testing options for homeowners. Focus on protecting workers and occupational health.

Testing

(613) 915-1721Call View Profile

WSP Canada Inc.

Ottawa, ON

4.7(19)Google

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

TestingMitigation

(613) 297-9555Call View Profile

Fengyun BI

Ottawa, ON

Offers comprehensive radon testing and mitigation services in Ottawa, ON. Uses state-of-the-art equipment with an experienced team, providing 5-star rated service for family safety.

Testing

(613) 223-0689Call View Profile

exp Services Inc.

Ottawa, ON

4.6(5)Google

exp Services Inc. is a multidisciplinary engineering, architecture, design and consulting firm whose services include air quality and industrial hygiene. Its Ottawa, ON office offers radon testing, with Leah Wells as C-NRPP certified staff.

Testing

(613) 688-1899Call View Profile

InAIR Environmental Ltd.

Ottawa, ON

Manages indoor and outdoor environmental quality for residential & commercial clients. Services include air quality assessments, mold testing & remediation, plus asbestos & lead management.

Testing

(613) 224-3863Call View Profile

EHS Partnerships Ltd.

Ottawa, ON

5.0(1)Google

Testing

(613) 828-8989Call View Profile

Parham Salehi

Ottawa, ON

MitigationTesting

View Profile

Arcadis SENES Canada Inc.

Ottawa, ON

Testing

View Profile

Kingston Radon Solutions

Glenburnie, ON

5.0(67)Google

Locally owned & operated, C-NRPP certified, offering radon testing, mitigation & DIY solutions. Installs Airwell™ systems for radon & other contaminants. Serving Kingston, Napanee, Gananoque, Belleville & surrounding areas.

TestingMitigation

(613) 217-4132Call View Profile

TBT Engineering

Thunder Bay, ON

4.7(17)Google

TBT Engineering is a C-NRPP certified radon testing professional serving Thunder Bay, ON and across ON. Their certified inspectors provide accurate radon measurements for homes and businesses.

Testing

(807) 624-5160Call View Profile

613environmental

Kinburn, ON

5.0(22)Google

Offers C-NRPP certified radon gas measurement and mitigation, from testing to custom system installation with guaranteed results. Serving Ottawa and Eastern Ontario.

TestingMitigation

(613) 415-4075Call 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

Local radon data

How common is high radon in Ottawa?

Moderate

1 in 6

homes tested in the Ottawa 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.

Ottawa

1 in 6

Ontario

1 in 7.6

Canada

1 in 5.6

Postal areas nearby with the highest estimates

806 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 Ottawa on the radon map

Test before you call a pro

Know your radon level in Ottawa 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 Ottawa

RadonFinder.ca lists C-NRPP certified radon testing and mitigation professionals serving Ottawa, 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.

Ottawa 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.