· Indoor radon
Radon ranking: Regina cluster leads 117 Health Canada geographies
OpenStats highest-indoor-radon ranking places Regina, Moose Jaw, and Weyburn at 301.7 Bq/m³ survey mean, with Winnipeg-area communities next at 256.7 Bq/m³.
By OpenStats data desk · Editorial standards
The 2026 highest indoor radon ranking covers 117 CMA and regional proxy communities matched to Health Canada survey geographies. Rank 1 is the highest long-term mean. Prairie and selected Quebec clusters still dominate the top of the chart. Coverage on OpenStats means a hometown slug exists with a labeled page on the radon atlas, not that every basement has been tested.
Who leads the 2026 table
Regina, Moose Jaw, and Weyburn share a 301.7 Bq/m³ survey mean at ranks -. Tied readings reflect shared Health Canada survey geography rather than three independent municipal sample campaigns. The next band is Manitoba: Winnipeg, Steinbach, Portage la Prairie, and Winkler at 256.7 Bq/m³. Sherbrooke-area communities in Quebec follow at 238.2 Bq/m³. Calgary appears mid-pack (rank 26 at 135.1 Bq/m³ in the current edition).
| Rank | Place | Survey mean (Bq/m³) |
|---|---|---|
| 1 | Regina | 301.7 |
| 2 | Moose Jaw | 301.7 |
| 3 | Weyburn | 301.7 |
| 4 | Winnipeg | 256.7 |
| 5 | Steinbach | 256.7 |
| 8 | Sherbrooke | 238.2 |
| 26 | Calgary | 135.1 |
The gap between the Regina cluster (301.7 Bq/m³) and Calgary (135.1 Bq/m³) is more than double on the survey mean. Health Canada’s action guidance for indoor radon focuses household testing and mitigation planning; OpenStats publishes community-level survey means for comparison. A mid-pack city like Calgary still warrants testing in ground-contact rooms even though it sits far below the prairie leaders. Rank order can change when OpenStats adds a newly matched geography or when Health Canada publishes an updated survey slice.
What coverage means on the atlas
Coverage means OpenStats can match a Health Canada survey geography to a hometown slug and publish a labeled page on the radon atlas. Direct municipal microdata is rare; most pages are regional estimates tied to the survey polygon. Figures are comparative community context. They do not replace a long-term test kit in your own living space. Health Canada still points households toward testing living areas, especially basements and ground-contact rooms.
The 117-community count is the size of the matched set in the current ranking edition. Cities without a survey match may still have a stub or proxy page on the atlas; those rows carry tier labels and may be excluded from the headline ranking until a defensible geography link exists. Saskatoon pages are useful for prairie readers comparing Regina’s survey mean to a nearby CMA with its own atlas entry. Always read the tier badge before comparing two cities on the chart.
How to read tiers and next steps
Regional proxy rows inherit a survey mean from a parent geography. They help readers in uncovered towns situate themselves relative to a known cluster. They should be quoted with the proxy label visible. When a direct municipal study exists elsewhere in the network, OpenStats prefers it; radon remains survey-driven for most Canadian cities because long-term indoor testing campaigns are sparse at the municipal level.
Background reading sits in the indoor radon guide. Data tiers, corrections, and advertising disclosure are on editorial standards. Test kit category pages on the radon atlas link to the ranking for context. Homeowners should treat the ranking as a map of where survey means run high, then confirm with a kit placed according to Health Canada instructions. OpenStats does not publish individual home results or realtor-style guarantees. Compare Calgary at rank 26 (135.1 Bq/m³) to the Regina cluster (301.7 Bq/m³) when you explain why prairie homeowners often test sooner than readers in lower-survey-mean cities. The ranking edition number on the hub matches the CSV export linked from the radon atlas rankings page. Winnipeg at 256.7 Bq/m³ sits between the Regina cluster and Sherbrooke at 238.2 Bq/m³, which makes Manitoba a distinct band on the map between Saskatchewan and Quebec survey means. Steinbach, Portage la Prairie, and Winkler share Winnipeg’s 256.7 Bq/m³ survey mean in the current table, which reflects shared survey geography rather than four independent municipal campaigns. Readers in those towns should still test their own homes.
Testing and mitigation context
Health Canada guidance treats long-term indoor exposure as the decision point for mitigation planning. OpenStats publishes survey means so readers can compare communities; a kit placed in a basement bedroom remains the household-level instrument. Radon test kit pages on the atlas link to the ranking for geographic context. Corrections and tier changes follow the same editorial workflow as permit and water updates on the hub.