The Canada Radon Map shows measured indoor radon results for areas across Canada — the share of tested homes in a province, region, or postal-code area whose result met or exceeded a recognized radon reference level. It reflects what radon testing has actually found in an area. It is not, and cannot be, a reading of your own home. Below: where the data comes from, what the numbers mean, how current it is, and how accurate it is.
What does the Canada Radon Map show?
For each area it shows the percentage of tested homes at or above a radon reference level, a typical (central) level, and how many long-term tests that figure is based on. You can view every area against three reference levels — the World Health Organization's 100 Bq/m³, the US EPA's 148 Bq/m³, and Health Canada's 200 Bq/m³ (shown by default).
Where does the radon data come from?
The map combines Canada's two largest measured radon surveys with federal geology and boundary data. Specifically:
- 2024 Cross-Canada Survey of Radon Exposure — a national compilation of 69,478 long-term residential radon tests, produced by a working group of the Evict Radon National Study, the BC Centre for Disease Control, and Health Canada.
- Health Canada's 2009–11 national radon survey — the earlier federal survey, used for comparison and in areas with limited recent data.
- Natural Resources Canada's airborne ground-uranium survey — geological context for the uranium beneath each area.
- Statistics Canada — 2021 Census geographic boundaries.
We use aggregated results, with permission where required, and combine, standardize, and quality-check them so the same measurements read consistently nationwide. We never publish anyone's individual test result.
Community results from Take Action on Radon's 100 Radon Test Kit Challenge are shown as clearly-labelled context where available, and are never combined with this map's survey statistics — they come from a different, self-selected testing cohort and method.
For some postal areas with sufficient historical testing, the 2009-11 result is shown at the postal-prefix (FSA) level — always labelled with its survey, year, and test count, and never combined with 2024 figures.
How current is the data — 2024 or 2009?
The map leads with the 2024 survey. For many areas it also shows Health Canada's earlier 2009–11 result as a separate, clearly dated comparison. Where an area has too little measured data to report reliably, it is shown as "no data" rather than filled with a guess. Every figure is labelled with the survey and year it comes from.
What do the numbers mean? Bq/m³ and radon reference levels
Radon is measured in becquerels per cubic metre (Bq/m³). The map shows the percentage of tested homes at or above three internationally recognized reference levels:
- 100 Bq/m³ — World Health Organization reference level.
- 148 Bq/m³ — US EPA action level (equivalent to 4 pCi/L).
- 200 Bq/m³ — Health Canada guideline, the Canadian standard and the map's default view.
Switching between them re-expresses the same measured results against each benchmark; it does not change the underlying data.
What is a safe radon level in Canada?
There is no known safe level of radon. Health Canada's guideline is 200 Bq/m³, and it recommends taking action to reduce levels above it — the higher the level, the sooner. But radon carries some risk below the guideline too, which is why Health Canada recommends that every home be tested regardless of area or guideline. A long-term test (91 days or more) is the only way to know your home's level; a map cannot measure it for you.
What does "the ground under your area" (uranium) mean?
It's a reading of naturally occurring uranium in the ground, from Natural Resources Canada's airborne survey. Uranium in soil and rock is the source material that radon comes from, so we show it as helpful background — but it is not part of the measured percentages, and it cannot clear or condemn any individual home. A lower-uranium area still contains high-radon houses. It's one more reason to test, never a reason to skip testing.
How accurate is the map — can it tell me my home's radon level?
No. The map shows area results, not your home. Radon varies dramatically from house to house on the same street — a "lower" area still contains high-radon homes, and a "higher" area contains low ones. The area figures are as accurate as the surveys behind them, with three limits worth understanding:
- Testing is voluntary. People choose to test, so area figures can read higher than a random survey would — a caution, not a defect.
- Areas differ in how much testing they've had. Thinly tested areas are shown as "no data" rather than estimated.
- The data reflects a period in time, labelled with its version and date; we update it as new published data becomes available.
The only way to know your own home's radon level is to test it with a long-term radon test kit.
Is this medical or professional advice?
No. This map is provided for general information only and does not constitute medical, health, or professional advice; do not rely on it for health decisions. There is no known safe level of radon, and Health Canada recommends that every home be tested.
Accuracy and no warranty
The data is drawn from third-party sources and is provided "as is." While we combine and check it with care, we do not warrant its accuracy, completeness, or fitness for any particular purpose, and it may contain errors or omissions inherent to the underlying surveys.
Limitation of liability
To the fullest extent permitted by applicable law, RadonTest.ca is not liable for any loss or damage arising from use of, or reliance on, this map, and any reliance is at your own risk. Nothing here excludes or limits liability for bodily or moral injury, or for intentional or gross fault, which cannot be excluded under applicable law. The binding terms governing your use are set out in our Terms of Service.
Using and sharing this map
You are welcome to link to this map and share it. The compilation, standardization, and presentation of this data are the proprietary work of RadonTest.ca. Systematic copying, scraping, automated extraction, bulk downloading, or redistribution of the map's data or underlying compilation is not permitted. Health organizations, researchers, educators, and media who wish to display area statistics or embed the map are welcome to contact support@radontest.ca for an attribution or embed arrangement.
Independence and trademarks
RadonTest.ca is an independent Canadian company and is not affiliated with or endorsed by Health Canada, Statistics Canada, Natural Resources Canada, the Evict Radon National Study, the BC Centre for Disease Control, the US EPA, or the WHO. All trademarks are the property of their respective owners. Our test kits are analyzed by a C-NRPP-certified Canadian laboratory.
Your use of this map is governed by our Terms of Service and Privacy Policy. Read this page in French / en français.
Suggested citation: Canada Radon Map, RadonTest.ca (2026), radontest.ca/pages/canada-radon-map. Underlying data: 2024 Cross-Canada Survey of Radon; Health Canada national surveys; Natural Resources Canada; Statistics Canada. Last updated July 2026 · Data version: 2024 survey compilation. Questions? support@radontest.ca. Spotted an error on this page? Report a correction.