Lab analysis is performed independently by Lex Scientific Inc. (C-NRPP certified, Guelph, ON). Results are reported against the Health Canada guideline of 200 Bq/m³. RadonTest.ca™ coordinates kit logistics and sample submission only. RadonTest.ca™ does not provide medical advice or health assessments.
Canada Radon Map
Measured radon levels by province, city and postal code — 2024 Cross-Canada Survey of Radon + Health Canada data
Homes tested for radonmapped across Canada · 2024 Cross-Canada Survey + Health Canada data
Nearly 1 in 5 Canadian homes (17.8%) test at or above Canada’s radon guideline. A map can’t measure your home — find your area, then test.
Find radon levels by postal code or city
Click a province to zoom in — then click a region for local numbers.
Map © 2026 RadonTest.ca · Data: 2024 Cross-Canada Survey of Radon (Evict Radon · BC CDC · Health Canada) & Health Canada · Boundaries © Statistics Canada 2021
Show homes at or above
Use or share this map
Free for homeowners, realtors, media and inspectors — with attribution to RadonTest.ca.
Media & researchers: high-resolution province & city graphics with stats and citations are in our media kit — request the media kit. Mitigators & bloggers: embed the map above, or link to your region.
Radon by region of Canada
Five broad regions of the country, by the share of homes at or above Canada’s 200 Bq/m³ guideline.
Highest-radon areas in Canada
Every measured area in Canada, worst first. 👆 Tap any row to open it on the map. Type a place (city or town) or tap a column to re-sort.
Convert your reading: Bq/m³ ↔ pCi/L
Test results and detectors sometimes use U.S. units (pCi/L). Convert instantly and see it against the guidelines.
⇌
| Bq/m³ | pCi/L | |
|---|---|---|
| 100 | 2.7 | |
| 148 | 4.0 | |
| 200 | 5.4 | |
| 600 | 16.2 |
How to read this map
Methodology & sources
Data: 2024 Cross-Canada Survey of Radon (69,478 long-term tests, 2009–2024) + Health Canada 2009–11 survey + NRCan airborne uranium (GSC Open File 7402, doi:10.4095/293359) — including ~10-km ground readings for 429 postal areas (FSA). Page updated July 2026.
This map lets you compare two independent national surveys. The default is the 2024 Cross-Canada Survey of Radon — the largest residential radon dataset in Canada (69,478 long-term tests, 2009–2024), assembled by a working group of the Evict Radon National Study, the BC Centre for Disease Control, and Health Canada.
- The map. Every one of Canada’s 293 census divisions is shaded by its measured radon; the survey publishes 190 reporting areas (each n≥25) covering 278 divisions, and 15 divisions are shown grey as “not enough data.” Participants chose to test, so area rates can run higher than a random-sample survey would show. Boundaries are Statistics Canada’s 2021 cartographic files, simplified by us; the shading and design are our own rendering of the survey’s published figures. Cities and metros are marked as points with their own weighted numbers.
- What the colours mean. Each census division, city and metro is shaded by the share of tested homes at or above your chosen level — the WHO reference (100 Bq/m³), the US EPA action level (148 Bq/m³ = 4 pCi/L), or Health Canada’s guideline (200 Bq/m³). By default this map shows the WHO reference level (100 Bq/m³) — the most protective benchmark; switch to the US EPA (148) or Health Canada (200 Bq/m³) levels anytime.
- Typical level is the geometric mean — the middle of the range for that area. Radon is log-normally distributed, so a minority of homes sit far above the average; that is why testing your own home is the only way to know.
- The EPA figure (148 Bq/m³) falls between the survey’s published 100 and 200 bands, so we estimate it with a log-normal fit to each area’s own reported percentages — no survey figure is altered. Where an area reported 0% above 200, the 148 figure is estimated conservatively from its 100 figure.
- Health risk. At the EPA action level, the US EPA projects about 7 in 1,000 lifetime lung-cancer cases among people who never smoked and 62 in 1,000 among smokers; the WHO estimates risk rises ~16% per 100 Bq/m³.
- The ground layer. Each area result also shows the uranium measured in the ground by NRCan’s airborne gamma-ray surveys (Radioactivity Map of Canada, GSC Open File 7402, Open Government Licence, doi:10.4095/293359), shown as an area mean — the source material radon comes from, and a measurement, not a model. Our calibration against the 2024 survey: it tracks how often areas exceed 100 Bq/m³ (r ≈ 0.6, n = 57 regions) but is weak at 200+ (r ≈ 0.3); housing, soils and winters decide the rest. Where the survey never flew — including most of BC, southern Ontario and the Montréal region — we say so instead of guessing. Ground data can flag an area; it can never clear one. Research & analysis: RadonTest.ca, 2026 — to our knowledge, the first Canadian map (as of July 2026) to pair measured indoor radon with geological source potential in one view.
Recommended citation: Cross-Canada Survey of Radon working group: a collaboration between the Evict Radon National Study, BC Centre for Disease Control and Health Canada. Cross-Canada Survey of Radon Exposure in the Residential Buildings of Urban and Rural Communities. Canada. Cross Canada Radon Survey. 2024. Version 1.1. Available at: www.crosscanadaradon.ca.
Radon map FAQ
How high is radon in Toronto?
In Toronto, about 4.5% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 43.0 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Toronto on the radon map
How high is radon in Montréal?
In Montréal, about 17.4% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 82.4 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Montréal on the radon map
How high is radon in Vancouver?
In Vancouver, about 0.9% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 17.1 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Vancouver on the radon map
How high is radon in Ottawa?
In Ottawa, about 17.0% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 85.9 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Ottawa on the radon map
How high is radon in Calgary?
In Calgary, about 15.5% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 102.5 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Calgary on the radon map
How high is radon in Edmonton?
In Edmonton, about 16.2% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 106.4 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Edmonton on the radon map
How high is radon in Quebec?
In Quebec, about 18.1% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 73.1 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Quebec on the radon map
How high is radon in Winnipeg?
In Winnipeg, about 37.4% of homes tested at or above Health Canada’s 200 Bq/m³ action guideline (2024 Cross-Canada Survey of Radon), with a typical level near 139.7 Bq/m³. This is an area-wide estimate — only testing your own home reveals its level. See Winnipeg on the radon map
Is there a safe level of radon?
No. Health Canada sets an action guideline of 200 Bq/m³, but there is no known safe level of radon — the risk rises the more you’re exposed. Above 200 Bq/m³, Health Canada recommends fixing your home within one year (sooner at higher levels). Read more →
What’s the difference between the WHO, US EPA and Health Canada radon levels?
The WHO reference level is 100 Bq/m³, the US EPA action level is 148 Bq/m³ (4 pCi/L), and Health Canada’s guideline is 200 Bq/m³. This map lets you compare your area against all three. Read more →
How do I find the radon level in my area?
Search your postal code or city above, or tap “Use my location.” You’ll see the share of nearby homes measured above each guideline. Because radon varies house to house, the only way to know your own home is to test it. Read more →
Which parts of Canada have the highest radon?
Manitoba, Saskatchewan, Nova Scotia, New Brunswick and parts of the Prairies and Atlantic show the highest measured levels — but elevated radon has been found in every province and territory, so testing matters everywhere. Read more →
How long does a radon test take?
Health Canada recommends a long-term test of at least 91 days (about three months) to get a reliable annual-average reading of your home. Read more →
What should I do if my radon is above 200 Bq/m³?
Health Canada recommends taking corrective action within one year, sooner if the level is high. Professional radon mitigation typically reduces levels by more than 80% — often 90% or more. Read more →
What does “the ground under this area” mean?
It’s the uranium measured in the top ~30 cm of ground by NRCan’s airborne gamma-ray surveys — the source material radon comes from, shown as a mean for your census division or postal area. It’s a real government measurement, not a model — but it can’t clear an area and it can’t test a house: homes on identical ground test very differently. Read more →
Where does this map’s data come from?
Measured results from the 2024 Cross-Canada Survey of Radon (69,478 long-term home tests) and Health Canada’s 2009–11 Cross-Canada survey — real measurements, not modelled predictions. Read more →
Radon by province & territory
Radon maps and measured levels for your province — Ontario, Alberta, Québec, British Columbia, Saskatchewan, Manitoba, and every province and territory below.
Radon levels by region in Canada (measured data)
Share of homes at or above Health Canada’s action guideline of 200 Bq/m³, from the 2024 Cross-Canada Survey of Radon (69,478 tests). A map shows area averages — only a test reveals your own home’s level.
Among major Canadian cities, Regina (46.6%), Halifax (38.7%) and Winnipeg (37.4%) have the highest share of homes at or above the 200 Bq/m³ guideline; Victoria (0.5%) and Vancouver (0.9%) are among the lowest. Nationally, about 1 in 5 homes (17.8%) are at or above Health Canada’s guideline (2024 Cross-Canada Survey of Radon).
| Province or territory | % ≥ 200 Bq/m³ | Typical level (Bq/m³) | Tests |
|---|---|---|---|
| Manitoba | 43.6% | 181 | 832 |
| Nova Scotia | 35.4% | 126 | 3,677 |
| Saskatchewan | 32.4% | 144 | 2,064 |
| New Brunswick | 28.3% | 113 | 2,655 |
| British Columbia | 24.4% | 102 | 19,711 |
| Yukon | 23.7% | 101 | 1,399 |
| Prince Edward Island | 20.5% | 82 | 146 |
| Quebec | 18.6% | 86 | 6,506 |
| Alberta | 17.5% | 104 | 24,034 |
| Ontario | 15.8% | 79 | 7,734 |
| Newfoundland and Labrador | 13.8% | 80 | 159 |
Radon in major Canadian cities (47)
| City | Province | % ≥ 200 Bq/m³ | Typical level (Bq/m³) |
|---|---|---|---|
| Regina | Saskatchewan | 46.6% | 182.7 |
| Bathurst | New Brunswick | 45.8% | 167.3 |
| Halifax | Nova Scotia | 38.7% | 135.7 |
| Winnipeg | Manitoba | 37.4% | 139.7 |
| Brandon | Manitoba | 36.1% | 147.0 |
| Trail | British Columbia | 34.7% | 149.8 |
| Thunder Bay | Ontario | 34.3% | 130.1 |
| Nelson | British Columbia | 33.7% | 136.5 |
| Prince George | British Columbia | 31.5% | 112.3 |
| Vernon | British Columbia | 30.7% | 128.6 |
| Okotoks | Alberta | 30.4% | 128.3 |
| Kelowna | British Columbia | 28.5% | 120.8 |
| Strathmore | Alberta | 28.3% | 124.0 |
| Whitehorse | YK | 27.8% | 111.5 |
| Penticton | British Columbia | 25.9% | 106.1 |
| High River | Alberta | 25.3% | 137.5 |
| Sherbrooke | Quebec | 24.9% | 91.8 |
| Kingston | Ontario | 23.7% | 76.6 |
| Fredericton | New Brunswick | 18.5% | 91.9 |
| Saint John | New Brunswick | 18.4% | 86.2 |
| Quebec | Quebec | 18.1% | 73.1 |
| Saskatoon | Saskatchewan | 17.8% | 107.2 |
| Montréal | Quebec | 17.4% | 82.4 |
| Ottawa | Ontario | 17.0% | 85.9 |
| Lethbridge | Alberta | 16.8% | 110.7 |
| Edmonton | Alberta | 16.2% | 106.4 |
| Calgary | Alberta | 15.5% | 102.5 |
| Red Deer | Alberta | 15.1% | 95.3 |
| Salmon Arm | British Columbia | 15.0% | 98.5 |
| Windsor | Ontario | 14.5% | 99.3 |
| Canmore | Alberta | 13.9% | 85.4 |
| Guelph | Ontario | 13.5% | 72.4 |
| Hamilton | Ontario | 12.0% | 71.1 |
| Medicine Hat | Alberta | 11.1% | 92.0 |
| Kitchener-Cambridge | Ontario | 10.2% | 73.1 |
| Kamloops | British Columbia | 9.5% | 61.3 |
| Cranbrook | British Columbia | 9.1% | 58.4 |
| Chilliwack | British Columbia | 8.4% | 61.9 |
| Moncton | New Brunswick | 8.1% | 62.8 |
| Centre Wellington | Ontario | 8.0% | 64.1 |
| Terrace | British Columbia | 7.8% | 49.4 |
| Quesnel | British Columbia | 5.8% | 59.3 |
| Toronto | Ontario | 4.5% | 43.0 |
| London | Ontario | 3.5% | 61.5 |
| Abbotsford - Mission | British Columbia | 3.4% | 40.0 |
| Vancouver | British Columbia | 0.9% | 17.1 |
| Victoria | British Columbia | 0.5% | 22.4 |
See all surveyed areas (census divisions) (190)
| Area | Province | % ≥ 200 Bq/m³ | Typical level (Bq/m³) | Tests |
|---|---|---|---|---|
| South Alberta (Div 3) | Alberta | 35.9% | 143.8 | 128 |
| East-central Alberta (Div 7) | Alberta | 29.8% | 140.3 | 47 |
| Strathmore area (Div 5) | Alberta | 28.6% | 131.1 | 217 |
| Red Deer area (Div 8) | Alberta | 25.6% | 110.7 | 422 |
| Southeast Alberta (Div 4) | Alberta | 24.2% | 122.7 | 33 |
| Northeast Alberta (Div 12) | Alberta | 23.5% | 113.8 | 85 |
| Northwest Alberta (Div 14) | Alberta | 22.2% | 96.5 | 54 |
| West-central Alberta (Div 9) | Alberta | 22.0% | 114.9 | 41 |
| North Alberta (Div 13) | Alberta | 20.7% | 109.2 | 92 |
| Canmore area (Div 15) | Alberta | 19.2% | 90.1 | 276 |
| East-central Alberta (Div 10) | Alberta | 18.8% | 102.1 | 154 |
| Edmonton area (Div 11) | Alberta | 17.3% | 108.3 | 4,397 |
| Calgary area (Div 6) | Alberta | 17.1% | 102.8 | 17,203 |
| Lethbridge area (Div 2) | Alberta | 16.7% | 110.4 | 407 |
| Medicine Hat area (Div 1) | Alberta | 11.3% | 91.7 | 177 |
| Northwest Alberta | Alberta | 6.8% | 76.4 | 191 |
| Northern Alberta & S. NWT | AB, NT | 10.9% | 73.6 | 110 |
| Central Kootenay | British Columbia | 41.6% | 162.2 | 2,837 |
| Kootenay Boundary | British Columbia | 33.8% | 145.1 | 745 |
| Columbia-Shuswap | British Columbia | 32.5% | 134.1 | 1,085 |
| Okanagan-Similkameen | British Columbia | 30.1% | 117.0 | 827 |
| Fraser-Fort George | British Columbia | 29.9% | 108.3 | 2,936 |
| North Okanagan | British Columbia | 29.0% | 124.7 | 921 |
| East Kootenay | British Columbia | 28.9% | 104.8 | 689 |
| Central Okanagan | British Columbia | 28.5% | 120.9 | 3,615 |
| Thompson-Nicola | British Columbia | 27.2% | 108.1 | 744 |
| Stikine | British Columbia | 19.4% | 77.2 | 36 |
| Peace River | British Columbia | 11.1% | 56.0 | 261 |
| Bulkley-Nechako | British Columbia | 10.1% | 51.1 | 148 |
| Central Coast, Mount Waddington | British Columbia | 8.2% | 38.1 | 49 |
| Cariboo | British Columbia | 7.8% | 58.2 | 357 |
| Kitimat-Stikine | British Columbia | 7.1% | 47.4 | 211 |
| Fraser Valley | British Columbia | 6.9% | 53.7 | 708 |
| Strathcona | British Columbia | 5.6% | 36.2 | 36 |
| Cowichan Valley | British Columbia | 5.3% | 38.5 | 94 |
| Northern Rockies | British Columbia | 4.8% | 59.2 | 83 |
| Sunshine Coast | British Columbia | 2.9% | 28.6 | 35 |
| Capital | British Columbia | 1.8% | 23.7 | 990 |
| Comox Valley | British Columbia | 1.6% | 21.2 | 61 |
| Squamish-Lillooet | British Columbia | 1.1% | 24.2 | 183 |
| Nanaimo | British Columbia | 1.0% | 18.4 | 386 |
| Greater Vancouver | British Columbia | 0.9% | 18.3 | 1,476 |
| Alberni-Clayoquot | British Columbia | 0.0% | 5.6 | 31 |
| Powell River | British Columbia | 0.0% | 22.4 | 27 |
| Skeena-Queen Charlotte | British Columbia | 0.0% | 9.9 | 140 |
| Southwest Manitoba | Manitoba | 74.6% | 325.3 | 59 |
| South Manitoba | Manitoba | 65.1% | 280.9 | 175 |
| Southwest Manitoba | Manitoba | 52.0% | 221.9 | 25 |
| Brandon area (Div 7) | Manitoba | 34.9% | 144.7 | 86 |
| Winnipeg area (Div 11) | Manitoba | 34.4% | 133.6 | 392 |
| South Manitoba | Manitoba | 28.4% | 129.3 | 95 |
| Victoria | New Brunswick | 57.7% | 192.4 | 189 |
| Carleton | New Brunswick | 50.0% | 141.3 | 46 |
| Gloucester–Northumberland region | New Brunswick | 39.8% | 137.1 | 98 |
| Madawaska | New Brunswick | 39.4% | 132.9 | 33 |
| York | New Brunswick | 32.4% | 123.2 | 1,049 |
| Kings | New Brunswick | 30.8% | 128.8 | 341 |
| Queens | New Brunswick | 27.8% | 101.3 | 36 |
| Charlotte | New Brunswick | 22.4% | 92.5 | 49 |
| Saint John | New Brunswick | 18.4% | 76.5 | 103 |
| Sunbury | New Brunswick | 14.8% | 79.2 | 54 |
| Westmorland | New Brunswick | 12.1% | 71.2 | 546 |
| Albert | New Brunswick | 8.1% | 58.1 | 111 |
| Southeast Newfoundland | Newfoundland and Labrador | 30.2% | 93.2 | 43 |
| Southeast Newfoundland (Div 1) | Newfoundland and Labrador | 9.6% | 92.9 | 52 |
| Labrador & Québec North Shore | NL, QC | 6.2% | 59.8 | 64 |
| Halifax | Nova Scotia | 38.7% | 137.2 | 2,854 |
| Lunenburg | Nova Scotia | 38.4% | 122.6 | 177 |
| Cape Breton, Richmond | Nova Scotia | 26.1% | 76.8 | 111 |
| Victoria, Inverness | Nova Scotia | 24.1% | 84.5 | 54 |
| Hants | Nova Scotia | 23.3% | 87.5 | 86 |
| Cumberland, Colchester | Nova Scotia | 22.9% | 89.7 | 118 |
| Kings | Nova Scotia | 21.6% | 76.2 | 116 |
| Pictou | Nova Scotia | 16.7% | 68.8 | 30 |
| Queens, Shelburne | Nova Scotia | 12.5% | 68.3 | 32 |
| Annapolis | Nova Scotia | 10.3% | 45.6 | 29 |
| Antigonish, Guysborough | Nova Scotia | 6.2% | 46.6 | 32 |
| Digby, Yarmouth | Nova Scotia | 2.6% | 46.1 | 38 |
| Lennox and Addington | Ontario | 44.7% | 130.7 | 38 |
| Kenora, Rainy River | Ontario | 43.8% | 156.3 | 32 |
| Lanark | Ontario | 42.1% | 137.6 | 114 |
| Thunder Bay | Ontario | 34.8% | 132.6 | 896 |
| Leeds and Grenville | Ontario | 31.4% | 113.0 | 220 |
| Renfrew | Ontario | 29.2% | 106.1 | 192 |
| Prince Edward | Ontario | 27.1% | 102.1 | 85 |
| Frontenac | Ontario | 23.4% | 74.8 | 214 |
| Hastings | Ontario | 21.4% | 67.3 | 56 |
| Perth | Ontario | 21.2% | 87.3 | 33 |
| Grey | Ontario | 20.6% | 73.8 | 63 |
| Chatham-Kent | Ontario | 20.5% | 109.7 | 44 |
| Lambton | Ontario | 19.0% | 86.7 | 42 |
| Oxford | Ontario | 18.5% | 92.5 | 27 |
| Peterborough | Ontario | 18.3% | 73.9 | 60 |
| Northumberland | Ontario | 15.4% | 37.7 | 39 |
| Essex | Ontario | 14.5% | 99.3 | 145 |
| Bruce | Ontario | 14.0% | 62.0 | 43 |
| Algoma–Cochrane region | Ontario | 13.3% | 86.1 | 60 |
| Hamilton | Ontario | 12.8% | 71.6 | 1,011 |
| Wellington | Ontario | 12.7% | 71.2 | 798 |
| Ottawa | Ontario | 12.0% | 72.8 | 1,349 |
| Niagara | Ontario | 11.6% | 62.9 | 95 |
| Huron | Ontario | 11.1% | 89.9 | 27 |
| Haliburton–Muskoka region | Ontario | 11.1% | 65.7 | 45 |
| Dufferin | Ontario | 10.8% | 66.7 | 74 |
| Waterloo | Ontario | 10.5% | 72.3 | 258 |
| Brant, Haldimand-Norfolk | Ontario | 10.0% | 76.1 | 50 |
| Parry Sound, Nipissing | Ontario | 10.0% | 60.0 | 30 |
| Prescott and Russell | Ontario | 9.9% | 61.3 | 71 |
| Halton | Ontario | 9.6% | 66.3 | 230 |
| Durham | Ontario | 6.1% | 41.9 | 114 |
| Simcoe | Ontario | 4.7% | 46.3 | 150 |
| Peel | Ontario | 4.4% | 45.5 | 113 |
| Middlesex | Ontario | 4.3% | 63.8 | 139 |
| York | Ontario | 4.0% | 37.5 | 177 |
| Stormont, Dundas and Glengarry | Ontario | 3.6% | 53.1 | 28 |
| Elgin | Ontario | 2.7% | 58.3 | 185 |
| Toronto | Ontario | 1.3% | 40.3 | 387 |
| Prince Edward Island | PE, QC | 20.5% | 81.8 | 146 |
| Avignon | Quebec | 63.6% | 228.9 | 55 |
| La Côte-de-Gaspé, Le Rocher-Percé | Quebec | 54.5% | 199.5 | 44 |
| L'Île-d'Orléans | Quebec | 44.4% | 140.9 | 27 |
| Les Collines-de-l'Outaouais | Quebec | 44.0% | 144.8 | 175 |
| Papineau, Antoine-Labelle | Quebec | 31.5% | 123.1 | 92 |
| La Mitis–La Matanie region | Quebec | 30.3% | 105.2 | 33 |
| Bonaventure, La Haute-Gaspésie | Quebec | 30.0% | 109.8 | 40 |
| Montmagny–L'Islet region | Quebec | 30.0% | 100.8 | 40 |
| Marguerite-D'Youville | Quebec | 29.8% | 127.5 | 215 |
| Sherbrooke | Quebec | 29.3% | 99.5 | 140 |
| Les Etchemins–Robert-Cliche region | Quebec | 28.1% | 115.6 | 57 |
| Deux-Montagnes | Quebec | 27.6% | 117.8 | 185 |
| La Vallée-du-Richelieu | Quebec | 26.4% | 117.4 | 474 |
| Rouville | Quebec | 25.0% | 82.7 | 32 |
| Rimouski-Neigette | Quebec | 23.1% | 103.0 | 65 |
| Brome-Missisquoi | Quebec | 22.8% | 98.0 | 57 |
| La Jacques-Cartier | Quebec | 22.1% | 94.6 | 86 |
| La Haute-Yamaska | Quebec | 22.0% | 87.5 | 50 |
| Thérèse-De Blainville | Quebec | 21.5% | 88.9 | 135 |
| Beauharnois-Salaberry–Le Haut-Saint-Laurent region | Quebec | 21.2% | 90.6 | 52 |
| Vaudreuil-Soulanges | Quebec | 20.5% | 92.8 | 132 |
| Roussillon | Quebec | 19.8% | 106.0 | 116 |
| Coaticook–Le Haut-Saint-François region | Quebec | 18.9% | 94.3 | 53 |
| La Rivière-du-Nord, Mirabel | Quebec | 18.5% | 71.6 | 92 |
| Les Maskoutains | Quebec | 18.0% | 74.5 | 50 |
| Témiscouata–Rivière-du-Loup region | Quebec | 17.9% | 83.5 | 28 |
| Québec | Quebec | 17.9% | 72.3 | 876 |
| Le Haut-Richelieu | Quebec | 17.9% | 86.3 | 84 |
| Laval | Quebec | 17.8% | 84.7 | 253 |
| Montréal | Quebec | 16.6% | 76.3 | 650 |
| Acton–Le Val-Saint-François region | Quebec | 16.1% | 63.3 | 31 |
| Gatineau | Quebec | 16.0% | 84.5 | 313 |
| La Côte-de-Beaupré–Charlevoix region | Quebec | 15.6% | 58.3 | 64 |
| Portneuf | Quebec | 14.0% | 70.2 | 57 |
| Memphrémagog | Quebec | 13.7% | 83.3 | 73 |
| L'Assomption | Quebec | 12.2% | 62.7 | 74 |
| Lotbinière, L'Érable | Quebec | 12.0% | 65.1 | 25 |
| Les Laurentides | Quebec | 11.6% | 47.0 | 43 |
| Lévis | Quebec | 8.5% | 52.7 | 129 |
| La Vallée-de-l'Or–Abitibi-Ouest region | Quebec | 8.3% | 58.8 | 60 |
| Lac-Saint-Jean-Est–Le Domaine-du-Roy region | Quebec | 7.7% | 57.1 | 26 |
| Longueuil | Quebec | 7.5% | 69.3 | 481 |
| Shawinigan, Mékinac | Quebec | 7.4% | 44.3 | 27 |
| Les Appalaches, Beauce-Sartigan | Quebec | 7.1% | 96.0 | 28 |
| Montcalm | Quebec | 7.1% | 41.1 | 28 |
| Les Moulins | Quebec | 6.7% | 60.7 | 75 |
| Nord-du-Québec–Le Saguenay-et-son-Fjord region | Quebec | 5.4% | 49.1 | 92 |
| Arthabaska | Quebec | 4.7% | 49.2 | 43 |
| Matawinie | Quebec | 4.0% | 38.3 | 25 |
| Drummond | Quebec | 3.5% | 37.7 | 57 |
| D'Autray, Maskinongé | Quebec | 3.2% | 39.6 | 31 |
| Rouyn-Noranda | Quebec | 3.2% | 32.1 | 31 |
| Joliette | Quebec | 2.9% | 44.6 | 34 |
| Pierre-De Saurel–Nicolet-Yamaska region | Quebec | 2.6% | 49.1 | 39 |
| Les Pays-d'en-Haut | Quebec | 1.7% | 40.8 | 60 |
| Francheville | Quebec | 0.0% | 37.1 | 110 |
| Argenteuil | Quebec | 0.0% | 55.4 | 31 |
| Abitibi | Quebec | 0.0% | 32.6 | 31 |
| Southwest Saskatchewan | Saskatchewan | 51.5% | 192.4 | 33 |
| Regina area (Div 6) | Saskatchewan | 46.0% | 181.3 | 818 |
| Northeast Saskatchewan | Saskatchewan | 40.4% | 153.2 | 47 |
| Southwest Saskatchewan (Div 8) | Saskatchewan | 37.1% | 165.5 | 70 |
| South Saskatchewan | Saskatchewan | 34.3% | 153.3 | 35 |
| West-central Saskatchewan | Saskatchewan | 30.9% | 133.1 | 55 |
| East-central Saskatchewan (Div 9) | Saskatchewan | 30.0% | 126.3 | 30 |
| Northwest Saskatchewan | Saskatchewan | 28.3% | 130.1 | 53 |
| Southeast Saskatchewan (Div 5) | Saskatchewan | 27.0% | 157.5 | 37 |
| North Saskatchewan (Div 15) | Saskatchewan | 26.5% | 116.9 | 68 |
| Southwest Saskatchewan (Div 7) | Saskatchewan | 26.0% | 124.3 | 50 |
| Saskatoon area (Div 11) | Saskatchewan | 18.2% | 107.7 | 707 |
| North Saskatchewan (Div 18) | Saskatchewan | 11.5% | 77.4 | 61 |
| Yukon | Yukon | 23.7% | 101.0 | 1,399 |
Our goal: one unified radon map for Canada
This is the first map in Canada to pair the country’s two largest measured radon surveys — 69,478 long-term tests (2024 Cross-Canada Survey of Radon) and Health Canada’s 2009–11 national survey — with NRCan’s airborne ground-uranium data (July 2026). We built it to be added to. Labs, researchers, universities and health units holding measured, de-identified area data: we’d like to fold it in, with credit — support@radontest.ca.
🔒 Your own test result is never added to this map unless you opt in — and then only as anonymous area statistics, never your name or address.
For general information only — not medical, health, or professional advice. Radon levels shown are area averages and cannot indicate any individual home’s radon level; only a long-term test can. RadonTest.ca is an independent Canadian company and is not affiliated with or endorsed by Health Canada, Statistics Canada, Natural Resources Canada, the Cross-Canada Survey of Radon working group, the US EPA or the WHO; their published data is used with attribution. Contains information licensed under the Open Government Licence – Canada. The 148 Bq/m³ estimates and ground-uranium area means are our own calculations from published data, provided “as is.” There is no known safe level of radon; 200 Bq/m³ is Health Canada’s action guideline.
© 2026 RadonTest.ca · Canada Radon Map. Map and design © RadonTest.ca. Radon data © Cross-Canada Survey of Radon working group, used with citation. Census-division boundaries © Statistics Canada 2021 (adapted).
Questions or media use: support@radontest.ca · 1-613-690-6328