· Indoor radon
2025 indoor radon ranking: Regina geography leads at 301.7 Bq/m³
OpenStats annual desk read on Health Canada survey means: Regina, Moose Jaw, and Weyburn tie first, Winnipeg metro follows at 256.7 Bq/m³, and Calgary sits mid-pack at rank 26.
By OpenStats data desk · Editorial standards
The OpenStats radon desk republishes the highest-mean ranking each year from Health Canada cross-provincial survey extracts. The 2025 edition keeps the same sorting rule as prior years: survey mean in Bq/m³, highest first. Regina, Moose Jaw, and Weyburn tie rank one at 301.7 Bq/m³ on the shared Regina geography grain. Winnipeg anchors a Manitoba cluster at 256.7 Bq/m³ with Steinbach, Portage la Prairie, and Winkler on the same metro tier.
Health Canada’s residential guideline is 200 Bq/m³. OpenStats mirrors that line in the percent-above-200 field on the radon atlas. Regina geography shows 56.3% of tests above the guideline. Winnipeg metro posts 47.5%. Those shares answer how common elevated readings are in the survey geography, while the mean still drives the highest radon ranking sort.
Top 25 survey means, 2025 edition
| Rank | Place | Mean Bq/m³ |
|---|---|---|
| 1 | Regina, SK | 301.7 |
| 2 | Moose Jaw, SK | 301.7 |
| 3 | Weyburn, SK | 301.7 |
| 4 | Winnipeg, MB | 256.7 |
| 5 | Steinbach, MB | 256.7 |
| 6 | Portage la Prairie, MB | 256.7 |
| 7 | Winkler, MB | 256.7 |
| 8 | Sherbrooke, QC | 238.2 |
| 9 | Cowansville, QC | 238.2 |
| 10 | Granby, QC | 238.2 |
| 11 | Halifax, NS | 194.7 |
| 12 | Kentville, NS | 194.7 |
| 13 | Truro, NS | 194.7 |
| 14 | Kingston, ON | 161.0 |
| 15 | Brockville, ON | 161.0 |
| 16 | Thunder Bay, ON | 159.1 |
| 17 | Windsor, ON | 156.4 |
| 18 | Chatham-Kent, ON | 156.4 |
| 19 | Sarnia, ON | 156.4 |
| 20 | Saskatoon, SK | 151.7 |
| 21 | Kelowna, BC | 135.3 |
| 22 | Kamloops, BC | 135.3 |
| 23 | Penticton, BC | 135.3 |
| 24 | Salmon Arm, BC | 135.3 |
| 25 | Vernon, BC | 135.3 |
Quebec’s Eastern Townships band (Sherbrooke, Cowansville, Granby) and Nova Scotia’s Annapolis Valley trio (Halifax, Kentville, Truro) fill the middle of the top twenty-five near or just below the 200 Bq/m³ guideline. Ontario entries climb through Kingston and Brockville at 161.0 Bq/m³ before Windsor and Sarnia post 156.4 Bq/m³. Saskatoon at 151.7 Bq/m³ sits below the Winnipeg tier despite sharing the same prairie soil story in casual talk.
Prairie leaders versus BC interior
The prairie contrast is not Alberta versus Saskatchewan alone. Regina geography means are more than double Calgary’s 135.1 Bq/m³ survey row. Calgary ranks 26 on the 2025 board with 15.2% of tests above 200 Bq/m³, a moderate band on atlas risk categories. Edmonton is lower still at 114.1 Bq/m³ and 8.3% above the line.
British Columbia’s interior cluster tells a different story than coastal Vancouver at 35.4 Bq/m³ and 1.5% above 200 Bq/m³. Kelowna, Kamloops, Penticton, Salmon Arm, and Vernon tie ranks 21 through 25 at 135.3 Bq/m³, essentially matching Calgary’s mean while sitting far below Regina or Winnipeg tiers. Prairie leaders and BC interior rows therefore share moderate survey means in some cities, but the percent-above field and household geology still diverge block by block.
Thunder Bay at 159.1 Bq/m³ and Kingston at 161.0 Bq/m³ show Ontario inland cities climbing the board without reaching prairie extremes. Halifax geography at 194.7 Bq/m³ sits just under the guideline mean, which is easy to misread as “safe city” language until you open the percent-above column for Annapolis Valley tiers.
Guideline context without address guesswork
A municipal mean is geography context, not a basement certificate. Health Canada recommends long-term testing, typically three months or more, before mitigation planning. The indoor radon guide covers kit duration and when to call a C-NRPP professional after a confirmatory reading. OpenStats does not replace that household step.
Moose Jaw and Weyburn should be read as Regina-geography survey rows, not independent campaigns with fresh sample designs. Winnipeg’s soft Shoal Lake water tier does not cancel the indoor-air cluster at 256.7 Bq/m³. Readers on Winnipeg hometown pages still see radon beside hardness and permits on one card.
City Score and what to open next
Radon is one equal-weight pillar on City Score. Calgary can post a strong composite when construction and connectivity pillars compensate for mid-pack indoor air. Regina faces more pressure on the radon pillar when the survey mean leads the national sort. Cross-read the City Score study after the ranking table so indoor air does not become the only story on a hometown page.
Real-estate disclosures sometimes cite “radon tested” without kit duration or the Bq/m³ figure. Ask for the long-term reading and test dates. Mitigation quotes belong with certified contractors after a confirmatory test, not after a ranking screenshot alone.
Winter heating season is the usual kit window when homes are closed and soil gas paths stabilize. Public-health units in several provinces still subsidize seasonal kit distribution; the atlas kits page lists long-term alpha-track options and monitor types with Health Canada duration notes beside the Amazon links.
Order a long-term kit through the radon atlas test kits page or a local public-health program, then log the result for your address. Browse row-level means, percent-above, and risk bands on the atlas before you test. When the 2026 edition ships, OpenStats will republish the same fields so year-over-year moves stay visible without rewriting the Health Canada guideline threshold.