About Radon Atlas

A map of what has actually been measured, built because the only public Canadian radon data was buried in federal files that nobody reads.

What This Is

Health Canada has published tens of thousands of radon measurements from Canadian homes. They sit on the federal open data portal as spreadsheets. They are genuinely useful and almost nobody has ever seen them, because a CSV of postal codes and becquerel readings is not something a homeowner can do anything with.

Radon Atlas puts them on a map, shows how many homes are behind every figure, and sets the newer 2024 national survey against them so you can see what has changed. That is the whole idea.

Who Runs It

Steve Crews, in Calgary, through OutreachVoice, a trade name of 1236326 Alberta Ltd. I am not a radon professional, I am not certified to test or to fix radon, and I do not do either. What I do is build things on the web, and this needed building.

How It Is Paid for

Right now, it isn't. It costs a domain and some hosting and I built it because the data deserved a map.

The intention is that it eventually pays for itself, in two ways. Certified companies may take a marked Featured position in their city's directory. And if someone contacts us looking for a radon company, we pass them to certified companies in their area, who may pay a referral fee for that introduction.

What that will never mean: every certified company stays listed free whether they pay or not, free listings stay in alphabetical order, and anything paid is labelled as paid where you can see it. If we ever recommend one company over another, it will be because of something we can point at, not because of who paid. The entire value of this site is that the numbers on it are honest, and there is no amount of money that is worth more than that.

Where the Data Comes from

• Health Canada, Radon and Thoron Data From Canadian Homes and Cross-Canada Survey of Radon Concentrations in Homes, both published on the federal open data portal under the Open Government Licence for Canada.
• The 2024 Cross-Canada Survey of Radon, a collaboration between the Evict Radon National Study at the University of Calgary, the BC Centre for Disease Control and Health Canada, drawing on more than thirty thousand tests taken between 2009 and 2024.
• Statistics Canada for postal district boundaries.
• The Canadian National Radon Proficiency Program for which companies hold current certification.

What We Are Careful About

• Sample sizes are shown next to every figure. Where a postal district has three tested homes in it, the page says three, because three houses cannot describe a neighbourhood.
• Untested areas are marked untested, never left blank, because a blank space reads as safe and it is not the same thing.
• The age of the data is stated. The Health Canada measurements were taken between 2009 and 2011. They are the best public record that exists and they are also fifteen years old, and both of those things are true at once.
• We do not tell you your house is at risk. No map can know that. Radon varies enormously between neighbouring houses, and only a test in your home describes your home.

If Something Here Is Wrong

Tell us and we will fix it, and say that we did. That applies to a company listing, a number, a map, or an interpretation. Contact page.