Radon in Alberta: Levels, Risk, Rules & What to Do

A note before you read. This is general consumer information for Alberta homeowners, buyers, sellers, landlords, and renters, drawn from publicly available Health Canada, University of Calgary / Evict Radon, Alberta Health Services / CancerControl Alberta, Government of Alberta, RECA, and peer-reviewed sources. It is not medical, legal, or warranty advice. Radon results are reported against the Health Canada guideline of 200 Bq/m³; RadonTest.ca coordinates testing logistics and does not interpret individual results or provide health assessments.

Key facts: radon in Alberta at a glance

• Alberta is among the highest-radon provinces in Canada. Health Canada's 2012 survey found about 7% of Alberta homes above the 200 Bq/m³ guideline (up to 10% in some regions, and over 50% in a few communities). The 2024 Cross-Canada Radon Survey places the Prairie region (which includes Alberta) at about 1 in 5 homes (20%) above the guideline — among the highest readings measured anywhere in the country.
• Newer Alberta homes tend to have more radon, not less. University of Calgary research found homes built since 1992 average 31.5% higher radon than older homes, and new Alberta builds now average around 131.6 Bq/m³ — a counterintuitive, well-documented finding.
• Radon is the number one cause of lung cancer in non-smokers. An Alberta study attributed about 16.6% of the province's lung cancers (≈324 cases in 2012) to residential radon.
• The Health Canada guideline is 200 Bq/m³ (annual average). Above it, Health Canada recommends acting within one year — sooner the higher the level.
• In Alberta, a known high radon result you haven't fixed must be disclosed when you sell. RECA treats an unmitigated result at or above 200 Bq/m³ as a material latent defect. Alberta's new-home warranty, however, does not cover radon.
• New Alberta homes have a radon rough-in built in — required by the Building Code since November 1, 2015.
• A valid test takes at least 91 days. Fixing a home usually costs in the low thousands and installs in a day or two.

How much radon is in Alberta homes?

Radon is a naturally occurring radioactive gas — colourless, odourless, tasteless — produced as uranium in soil and rock breaks down. It seeps indoors and accumulates. Every Alberta home has some; the question is how much, and Alberta's numbers are among Canada's highest.

Two datasets describe the province, and they measure different things:

• Health Canada's Cross-Canada Survey (data 2009–2011, published 2012). About 7% of Alberta homes tested at or above 200 Bq/m³ — with up to 10% in certain regions, and later community testing finding pockets where more than 50% of homes were above the guideline.
• The 2024 Cross-Canada Radon Survey (Evict Radon / University of Calgary, with Health Canada and CAREX Canada). It reports by region rather than a single Alberta figure: the Prairie and Northwest Territories region — which includes Alberta — sits at about 1 in 5 homes (20%) at or above 200 Bq/m³, with a regional average near 113 Bq/m³, "amongst the highest observed for any geographic area." Rural prairie homes are higher still (about 1 in 4).

The 7% (2012) and ~20% (2024) figures aren't contradictory — they come from different studies, years, and methods (a randomized federal sample versus a large census-weighted citizen-science study). The direction is what matters: Alberta is a high-radon province, and Health Canada now uses "1 in 5" as its national headline. (For how the provinces compare, see radon levels by province.)

What this means for you: averages don't describe your house. Two homes on the same street can read very differently depending on soil, foundation, and ventilation. A long-term test is the only way to know your own number.

The Alberta surprise: newer homes often have more radon

It's natural to assume a newer home is lower-risk. In Alberta, the data says the opposite. University of Calgary researchers (the team behind Evict Radon) found:

• In a study of more than 2,300 southern Alberta homes, those built in 1992 or later averaged 31.5% higher radon than older homes.
• The 2024 survey, using Alberta's unusually deep dataset, found radon rising steadily with build year — up about 39 Bq/m³ over the last ~50 years — with new Alberta homes now averaging around 131.6 Bq/m³, the highest on record.

Why? Newer prairie homes tend to be larger, taller, and more airtight, which can concentrate soil gas indoors. Counterintuitively, the research also found homes with heat-recovery ventilators (HRVs) among the highest average radon — an active area of study. The takeaway isn't that new construction is bad; it's that a new home is not a reason to skip testing — if anything, it's a reason to test.

Radon by region and city in Alberta

From the 2024 Cross-Canada Radon Survey (census-weighted metro figures):

Two patterns stand out. First, rural and small-town Alberta tends to be higher than the big cities — a reminder that acreages and smaller communities shouldn't assume they're in the clear. Second, even Calgary and Edmonton, at roughly 1 in 6, are well above the national average. (Published city-by-city percentages aren't available for every centre — for Red Deer, Medicine Hat, Fort McMurray, and Airdrie, test results, not assumptions, are what matter.)

Find your city: we maintain detailed local guides for Calgary, Edmonton, Red Deer, Lethbridge, Medicine Hat, Fort McMurray, and Airdrie.

Why Alberta has so much radon: the geology

Radon levels track the amount of uranium and thorium in the ground beneath a home. Alberta sits on the Western Canada Sedimentary Basin — a deep wedge of sedimentary rock — overlain by glacial soils, both of which carry uranium and radium distributed across the prairies. As Health Canada puts it, radon "can be found in almost all homes in Canada," but concentrations "are usually higher in areas where there is a higher amount of uranium in underlying rock and soil." Alberta's combination of uranium-bearing ground and permeable prairie soils helps explain why the province — and the prairies generally — rank among the highest in the country. As always, the local picture varies house by house.

Is radon dangerous? The health risk in Alberta

Radon is classified by the International Agency for Research on Cancer as a Group 1 carcinogen — the highest category, alongside tobacco smoke and asbestos. Health Canada's current figures:

• Radon is the number one cause of lung cancer in non-smokers, and the second leading cause overall after smoking.
• About 16% of lung-cancer deaths in Canada are estimated to be radon-related — more than 3,000 a year (Health Canada's fact sheet cites about 3,200).
• Health Canada estimates a non-smoker exposed to high radon over a lifetime has roughly a 1 in 20 chance of developing lung cancer from it; for a smoker, the combined risk rises to about 1 in 3.

For Alberta specifically, a peer-reviewed study by CancerControl Alberta / Alberta Health Services and the University of Calgary estimated that about 16.6% of the province's lung cancers were attributable to residential radon — roughly 324 cases in 2012 — with the attributable share even higher among people who never smoked. (That figure reflects 2012 data and counts cases, not deaths; with measured radon prevalence having risen since, the current burden may be higher.) University of Calgary researchers also estimate that acting promptly to test and reduce radon can cut a person's lifetime lung-cancer risk by as much as 40%.

Health Canada frames the risk proportionately, and so do we: there is no level of radon that is completely risk-free, the risk below the guideline is small, and it is ultimately each homeowner's choice what level of exposure they are willing to accept. Radon acts over the long term, with no immediate symptoms. The point isn't alarm — radon is measurable and fixable, and testing is inexpensive. (To separate fact from fiction, see our top radon misconceptions.)

The Health Canada guideline — and what your number means

Canada's guideline is 200 becquerels per cubic metre (Bq/m³), measured as an annual average in a normally occupied area of the home. It's a health-based guideline, not a hard legal limit for private homes. Health Canada's guidance:

• At or above 200 Bq/m³: take corrective action to reduce the level, within one year — and sooner the higher the result.
• Below 200 Bq/m³: no corrective action is recommended, though no level is risk-free; some households (especially where someone smokes) choose to act toward the WHO's more protective 100 Bq/m³ reference level.

Your result is a concentration, not a pass/fail — it sits on a spectrum. For what each range means and what Health Canada recommends at each, see how to read your radon test results and our comparison of the Health Canada, WHO, and US thresholds.

How to test for radon in Alberta

Testing is the only way to know your home's level:

• Use a long-term test of at least 91 days (three months). Radon swings day to day and season to season; a 91+ day average reflects your real exposure. Short-term tests are only for checking a mitigation system, never for deciding whether to act.
• The heating season (roughly October–April) gives the most conservative reading and is ideal, but Health Canada's current guidance allows testing in any season. If you start in spring or summer, a longer test (six months or more) gives a more reliable result.
• Place the detector in the lowest lived-in level (often the basement if it's used), in a room occupied more than four hours a day, about 30 cm off the floor and away from drafts, vents, and direct sun. Not the kitchen, bathroom, or laundry room.
• Use a C-NRPP-approved test. RadonTest.ca kits use an alpha-track detector analysed by a C-NRPP-certified laboratory. (For how long-term kits compare with continuous digital monitors, see our guide.)

Where to get your test: order a RadonTest.ca kit — the detector, analysis by a C-NRPP-certified laboratory (with an all-in-Canada analysis option), tracked shipping both ways, and your result delivered with clear Health Canada context are all included. One caution about cheaper retail kits: not every hardware-store kit is analysed by a C-NRPP-certified lab — see our comparison of hardware-store radon test kits.

When to retest. Health Canada recommends testing again after any renovation that affects your home's structure or ventilation (a finished basement, new furnace, added bathroom), after energy retrofits (new windows, insulation, air sealing), or after excavation near the foundation. If you install a mitigation system, retest every five years to confirm it's still working. There's no blanket "every five years" rule for an unmitigated home — the trigger is change. (See when is radon testing season in Canada.)

If your radon is high: mitigation in Alberta

A result above 200 Bq/m³ is a solvable problem (here's what to do if your radon is above 200 Bq/m³). Health Canada recommends hiring a C-NRPP-certified radon mitigation professional — and Alberta, as a long-recognized hotspot, has an active, established mitigation industry.

How it works. The standard, most effective method is active soil depressurization (ASD), also called sub-slab depressurization: a pipe through the foundation slab and a continuously running fan draw radon from beneath the home and vent it outside before it can enter your living space. In most homes this reduces radon by more than 80%, and a system usually installs in one to two days. A good contractor will run the fan continuously (never off), check that the system doesn't cause "back-drafting" of a furnace, water heater, or fireplace, and verify the work with a short-term test after activation plus a long-term test the following heating season — ideally not the company that installed it.

What it costs. There's no authoritative Alberta-only average, but Take Action on Radon's national data puts the typical mitigation cost around $2,700, and Health Canada estimates $2,000–$3,000 for a typical sub-slab system (complex buildings cost more). Running the fan adds roughly $50–$75 a year in electricity. (See radon mitigation cost in Canada.)

Find a certified professional. The Canadian National Radon Proficiency Program (C-NRPP) — run by the Canadian Association of Radon Scientists and Technologists with Health Canada oversight — certifies radon measurement professionals, mitigation professionals, and labs. Search the directory at c-nrpp.ca/find-a-professional. RadonTest.ca does not perform mitigation or recommend specific companies. (See also how to choose a licensed radon mitigator.)

Alberta's radon rules and protections

Alberta's mix is distinctive — strong on disclosure and building code, but with no warranty backstop.

New-home warranty: no radon coverage

Alberta has required a mandatory new-home warranty since February 1, 2014 (under the New Home Buyer Protection Act), on a 1-2-5-10 model (one year on labour and materials, two on distribution systems, five on the building envelope, ten on major structural components). Radon is not a covered defect under that warranty. This is an important contrast with Ontario, where the Tarion warranty explicitly covers radon mitigation up to $50,000 — Alberta has no equivalent backstop, so the cost of fixing radon in a new Alberta home generally falls to the owner. (For the cross-country picture, see does your new home warranty cover radon?)

Building Code: a radon rough-in since 2015

On the construction side, Alberta is ahead of much of the country. Since November 1, 2015, the Building Code has required new homes to be built with a radon rough-in — a gas-permeable layer and soil-gas membrane under the slab, and a sealed, labelled pipe (at least 100 mm) ready for a fan to be added later. The requirement carries into the current National Building Code – 2023 Alberta Edition (in force May 1, 2024) and applies province-wide. A rough-in is not an active system: if a later test shows elevated radon, a fan completes it. The Code governs new construction only. (More detail: Canadian building codes and radon.)

Selling a home: disclosure is stronger than you'd expect

Alberta is generally a "buyer beware" (caveat emptor) province with no mandatory seller property-disclosure form — but radon is a notable exception. Per the Real Estate Council of Alberta (RECA), if a seller has tested and the result is 200 Bq/m³ or higher and they have not mitigated it, that is a material latent defect that must be disclosed to potential buyers; a real-estate professional told to conceal it must refuse to continue providing services. The duty is triggered by a known, unmitigated high result — there's no obligation to test before selling, and a home that has been professionally mitigated becomes a selling feature rather than a defect. If you're buying, make radon part of your due diligence. (See radon when buying or selling a home in Canada.)

Workplaces, rentals, and daycares

Alberta's provincial Occupational Health and Safety Code sets no numeric radon limit; provincial guidance points employers to Health Canada's 200 Bq/m³ guideline. Separately, federally regulated workplaces in Alberta (banks, telecom, interprovincial transport, federal operations) fall under the new federal rule SOR/2026-10, which sets a binding limit of 200 Bq/m³ (replacing the old 800 Bq/m³) coming into force around February 2027. For rental housing, see our guides for landlords and renters. Note that Alberta has no law requiring radon testing in daycares or childcare facilities — a 2017 bill that would have required it never became law.

Financial help in Alberta

• No Alberta provincial radon grant or tax credit exists. Unlike Ontario (where the Tarion warranty can cover new-home mitigation), Alberta offers no dedicated provincial radon subsidy.
• Lungs Matter (Canadian Lung Association) offers up to $1,500 toward home radon mitigation, prioritizing people diagnosed with lung cancer and lower-income households (a long-term C-NRPP test result at or above 200 Bq/m³ is required).
• Seniors may be able to use Alberta's SHARP program (a low-interest home-equity loan for health-and-safety repairs) toward mitigation — confirm eligibility with the program, as it is not radon-specific.
• There is currently no open federal radon-mitigation grant for the general public.

Frequently asked questions

What is a risk-free radon level in Alberta? No level is completely risk-free. Health Canada's guideline is 200 Bq/m³, the level above which it recommends acting within a year. The risk below the guideline is small but not zero, and the WHO references a more protective 100 Bq/m³.

How common is high radon in Alberta? Health Canada's 2012 survey found about 7% of Alberta homes above the guideline (up to 10%+ regionally); the 2024 Cross-Canada Radon Survey places the Prairie region, including Alberta, at about 1 in 5. Calgary and Edmonton are each around 1 in 6.

Do newer homes in Alberta have less radon? No — Alberta research found the opposite: homes built since 1992 average about 31.5% higher radon, and new builds now average the highest levels on record. A new home is a reason to test, not to skip it.

Does Alberta's new-home warranty cover radon? No. Unlike Ontario's Tarion warranty, Alberta's mandatory new-home warranty does not cover radon mitigation.

Do I have to disclose radon when selling a home in Alberta? If you have tested and know the level is 200 Bq/m³ or higher and haven't fixed it, yes — RECA treats that as a material latent defect that must be disclosed. There's no obligation to test before selling.

How much does radon mitigation cost? Typically the low thousands; Health Canada estimates $2,000–$3,000 for a typical system, and national data averages around $2,700.

Do new Alberta homes have radon protection built in? Yes — since November 1, 2015, the Building Code has required a radon rough-in in new homes. It's a passive rough-in; a fan is added if a later test shows elevated radon.

How long does a radon test take? At least 91 days (three months) for a valid long-term result. Short-term tests aren't suitable for deciding whether to act.

Test your Alberta home

Alberta is among the highest-radon provinces in Canada, and newer homes can be the worst. Radon is invisible and fixable — but the only way to know your level is a long-term test.

Order your RadonTest.ca kit → — lab analysis by a C-NRPP-certified laboratory (with an all-in-Canada analysis option), tracked shipping both ways, and your result delivered with clear Health Canada context.

Sources

1. Health Canada — Radon guideline / About radon (200 Bq/m³; corrective action within 1 year), modified 2025-09-24. https://www.canada.ca/en/health-canada/services/health-risks-safety/radiation/radon/about.html
2. Health Canada — Radon: What you need to know ("1 in 5 homes," 16% of lung cancers, ~3,200 deaths), 2025. https://radontest.ca/links/hc-what-you-need-to-know
3. Health Canada — Reduction Guide for Canadians (>80%, $2,000–$3,000, 1-in-20 / 1-in-3 lifetime risk, fan operating cost), modified 2025-09-24. https://www.canada.ca/en/health-canada/services/environmental-workplace-health/reports-publications/radiation/radon-reduction-guide-canadians-health-canada.html
4. Health Canada — Guide for radon measurements in homes (91-day test, season guidance, retest triggers, 5-year retest for mitigated homes), modified 2025-12-22. https://radontest.ca/links/hc-measurements-guide
5. 2024 Cross-Canada Radon Survey (Evict Radon / University of Calgary) — Prairie region ~1 in 5; Calgary ~15.5%, Edmonton ~16.2%; construction-year finding. https://crosscanadaradon.ca/survey/
6. University of Calgary / Evict Radon — Growing number of Canadian households contain dangerous levels of radon (national 2024 figures; up to 40% risk reduction). https://evictradon.org/news/growing-number-of-canadian-households-contain-dangerous-levels-of-radon-gas/
7. Stanley FKT, Goodarzi AA, et al. — Radon exposure in southern Alberta (CMAJ Open, 2017): homes built 1992+ averaged 31.5% higher; 12.4% ≥200. https://www.cmajopen.ca/content/5/1/E255
8. Grundy A, et al. — Lung cancer incidence attributable to residential radon exposure in Alberta in 2012 (CMAJ Open, 2017): ~16.6% / ≈324 cases. https://www.cmajopen.ca/content/5/2/E529
9. Take Action on Radon — Alberta (7% baseline; up to 50%+ in some communities; Lethbridge 12%; kit/lending programs). https://takeactiononradon.ca/provinces/alberta/
10. Government of Alberta — New home warranty overview (coverage tiers; radon not listed). https://www.alberta.ca/new-home-warranty-overview
11. Government of Alberta — Building codes and standards (NBC 2023 Alberta Edition, in force 2024-05-01; radon rough-in since 2015). https://www.alberta.ca/building-codes-and-standards
12. Real Estate Council of Alberta (RECA) — Radon information bulletin (known unmitigated ≥200 Bq/m³ = material latent defect to disclose), revised 2019. https://www.reca.ca/wp-content/uploads/PDF/Radon.pdf
13. Canada Gazette Part II — SOR/2026-10 (federal workplaces: 200 Bq/m³, in force ~Feb 2027), 2026-02-11. https://gazette.gc.ca/rp-pr/p2/2026/2026-02-11/html/sor-dors10-eng.html
14. Canadian Lung Association — Lungs Matter radon mitigation grant (up to $1,500). https://www.lung.ca/air-quality/radon/lungs-matter-radon-mitigation-support

Lab analysis is performed independently by a C-NRPP-certified laboratory. Results are reported against the Health Canada guideline of 200 Bq/m³. RadonTest.ca coordinates kit logistics and sample submission only — it does not interpret or modify lab results and does not provide medical, legal, or warranty advice. Information attributed to Health Canada, RECA, and others is summarized from the public sources listed above; confirm time-sensitive details (warranty coverage, building-code requirements, disclosure obligations, program availability) with the responsible body.