Radon in Canada
Official radon data, regulations and resources
National reference level
200 Bq/m³
Competent authority
What should you do?
Regardless of the official classification, the only way to know the radon level in a specific building is to measure it. A long-term test (at least 3 months) is recommended. You can either test yourself with passive detectors or hire a certified professional.
Regulations & obligations
Dwellings
Guideline 200 Bq/m³ for homes, offices and schools (Health Canada, not legally binding federal law). Measurement and mitigation recommended if exceeded.
Workplaces
Employers must measure if radon exceeds 200 Bq/m³. Mitigation recommended. Occupational exposure governed by provincial regulations.
New construction
National Building Code (2020) requires radon protection measures in new buildings in radon-affected areas: soil gas barriers, rough-in provisions.
Professional services
C-NRPP
C-NRPP Radon Measurement Professionals
Canadian National Radon Proficiency Program certified measurement professionals
Accredited by: C-NRPP
C-NRPP
C-NRPP Radon Mitigation Professionals
C-NRPP certified mitigation professionals with mentorship program completion
Accredited by: C-NRPP
C-NRPP
C-NRPP Radon Analytical Laboratories
C-NRPP accredited radon analytical laboratories
Accredited by: C-NRPP
How radon is measured in Canada
Each country has its own official measurement protocol. Here is how radon testing works according to the national guidelines.
Measurement method
Alpha-track detectors or continuous radon monitors
Minimum duration
At least 3 months (91 days); long-term preferred
Recommended season
October–April (heating season), windows and doors closed
Detector placement
Lowest occupied level, main living area, away from exterior walls and windows
Laboratory requirements
C-NRPP-certified measurement professional or approved device
Reference standard: CAN/CGSB-149.11 · Health Canada Radon Guideline
How to test for radon yourself
Regardless of where you live, testing for radon is easy and affordable. A long-term measurement with passive detectors is the most reliable way to know your indoor radon level.
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