Legal Notice

Nature of the measurements

The measurements shown on this map are self-reported by citizens, anonymously. They are neither verified nor certified by any professional third party. No individual measurement shown on this site constitutes a professional radon assessment of any specific property, and none should be interpreted as such.

Absence of data

The absence of a measurement in an area does not mean the absence of radon risk in that area. It only means that no one has submitted a measurement there yet. An empty area on the map should never be interpreted as a low-risk area.

Reliability and test duration

Radon concentration in a building varies significantly by season, weather, and ventilation. Health Canada recommends a test of at least 91 days to obtain a reliable result. Tests shorter than 91 days are labeled “indicative” on the map: they provide useful information, but are less reliable than a long-term test and are excluded from area-level averages.

No warranty

The operator of this site does not warrant the accuracy of any individual measurement submitted by a contributor. This map, or any page of this site, should never be the sole basis for a property transaction decision. A professional test performed by a certified radon measurement specialist remains the only way to obtain a reliable assessment of radon in a specific building.

Affiliate links

Some pages on this site, notably the detector recommendations, contain affiliate links to Amazon. If you buy through these links, the operator of this site earns a commission at no extra cost to you. These commissions go solely to keeping this site running: they cover the site’s hosting and operating costs, which are real. The recommendations remain editorial and follow Health Canada’s measurement protocol (91 days or more) and C-NRPP-listed devices — they are not paid placements. As an Amazon Associate I earn from qualifying purchases.

Attribution

The basemap and geocoded addresses shown on this site come from third-party providers, credited directly on the map (the attribution strip at the bottom of the screen), in accordance with their respective license terms.

The radon statistics per forward sortation area shown on postal-code searches come from Health Canada’s residential radon surveys (2009-2013). Contains information licensed under the Open Government Licence – Canada. Contains information reproduced with the permission of Canada Post Corporation. Postal code is an official mark of Canada Post.