Radon in Calgary (2026): What the Data Shows, Why It's High, and What Calgary Homeowners Should Do

Flat-vector map of Canada with a coral red pin marking Calgary, Alberta, alongside a circular badge showing 12% — Calgary-area share (1 in 8) of homes above the Health Canada radon guideline

A note before you read. This article is general health and home-testing information for Calgary homeowners, drawn from Health Canada, the City of Calgary, the University of Calgary's published radon research, and the Canadian Cancer Society. It is not medical advice. See full disclaimers at the bottom.

If you live in Calgary and you've heard radon is a problem here, the data backs you up. Calgary has been studied more carefully than almost any other Canadian city for residential radon, and the published findings are clear: about 1 in 8 Calgary-area homes test above the Health Canada guideline of 200 Bq/m³, the average Calgary home in the largest published local study tested at roughly 126 Bq/m³, and individual home readings ranged from below 15 Bq/m³ all the way up to 3,441 Bq/m³ — a more than 200-fold spread between the lowest and highest single homes in the study.

That's the bad news. The good news is that Calgary is also one of the easiest cities in Canada to do something about it. There's a strong local mitigation industry, the Canadian Lung Association's "Lungs Matter" program offers up to $1,500 toward radon mitigation costs, the City of Calgary publishes its own radon resource page, and a long-term radon test kit costs about $89 all-in.

This guide walks through the published Calgary-specific data, explains why Calgary's geology and climate produce some of the highest residential radon levels in North America, addresses the counterintuitive finding that newer Calgary homes often have more radon than older ones, and finishes with the practical step that resolves the question for any Calgary home.

TL;DR for Calgary homeowners

  • About 1 in 8 Calgary-area homes test above the Health Canada guideline of 200 Bq/m³ — meaningfully higher than the ~1 in 14 Canadian national average (U of Calgary CMAJ Open 2017 study, Health Canada Cross-Canada Survey).
  • The average Calgary home tested in the U of Calgary study had a radon level of 126 Bq/m³ — well above the national average and below but uncomfortably close to the action guideline.
  • No Calgary neighbourhood is risk-free. Elevated radon was found in homes across the entire surveyed region. The only way to know your home's level is to test it.
  • Newer Calgary homes (built 1992 or later) tend to have higher radon levels than older Calgary homes, per the same study. Modern energy-efficient construction is part of the reason.
  • Mitigation works. A C-NRPP-certified mitigation system reduces radon by up to 95% at a typical Alberta cost of $2,500–$4,500, often partially offset by the Canadian Lung Association's "Lungs Matter" grant (up to $1,500). Order a $89 long-term radon test kit →

Table of contents

  1. What the published Calgary radon data actually shows
  2. Why Calgary radon is so high — geology, climate, and construction
  3. The counterintuitive finding: newer homes, more radon
  4. What to do as a Calgary homeowner
  5. Local Calgary and Alberta resources
  6. FAQ — Calgary-specific questions
  7. Disclaimers
  8. Sources

What the published Calgary radon data actually shows

The single best dataset on Calgary residential radon is a 2017 University of Calgary–led study published in CMAJ Open, which tested 2,382 homes (2,018 in Calgary and 364 in surrounding townships) for radon over 90+ days between 2013 and 2016. (Goodarzi et al., CMAJ Open)

The headline findings, taken directly from the published paper:

  • Average indoor radon level across all tested Calgary-area homes: 126 Bq/m³
  • 48% of Calgary-area homes had radon levels at or above 100 Bq/m³ (the WHO recommendation level)
  • 12% of Calgary-area homes had radon levels at or above 200 Bq/m³ (the Health Canada action guideline)
  • Range: less than 15 Bq/m³ to 3,441 Bq/m³ — a more than 200-fold difference between the lowest and highest single home in the study

For Canadian context: Health Canada's national 2012 Cross-Canada Survey found about 7% of homes nationally above the 200 Bq/m³ guideline. Calgary's 12% is meaningfully higher than the published national average (the two studies used different methodologies and time periods, but the directional gap is consistent across both datasets), and more recent U of Calgary research suggests the proportion may have grown.

The study also found that radon levels in Calgary do not concentrate in any single neighbourhood. Quoting the published paper: "the results show that there is no unaffected neighbourhood." Geological factors that produce radon are widely distributed across the Calgary region, which means the only way to know your specific home's radon level is to test that specific home — neighbourhood-level statistics don't substitute for a home-specific measurement.

Order a $89 long-term radon test kit →

Why Calgary radon is so high — geology, climate, and construction

Three independent factors stack to produce Calgary's elevated residential radon:

1. Geology. Calgary sits on the eastern edge of the Canadian Rocky Mountain foothills, on glacial soils derived in part from uranium-bearing bedrock. The natural breakdown of uranium in soil and rock produces radon gas; areas with higher uranium content in the soil tend to have higher background radon. Calgary's regional geology is in the higher range for North America.

2. Climate. Calgary's heating season is long — typically late September through early May. During those months, homes are sealed against the cold, furnaces and HVAC systems run constantly, and the natural "stack effect" (warm air rising through the home creating negative pressure at the lowest level) actively pulls soil gas into basements. Outdoor air dilution that would lower indoor radon during summer is significantly reduced for 7+ months of the year. Calgary residents also tend to spend more time indoors during heating season — concentrating exposure on the highest-radon period.

3. Building construction. Calgary has been one of Canada's fastest-growing cities for decades, with substantial new housing stock built since the 1990s. Modern residential construction emphasizes energy efficiency: tighter building envelopes, less natural air exchange, larger basement living areas, and increased use of finished basement space. All of these tend to increase indoor radon concentrations, even though they reduce energy consumption. (More on this in the next section.)

The combination — uranium-bearing geology + 7-month heating season + modern energy-efficient construction — is why Calgary measurably and consistently exceeds the Canadian residential radon average. None of these factors are unique to Calgary, but the combination is.

The counterintuitive finding: newer Calgary homes often have more radon

This is the part of the U of Calgary research that most Calgary homeowners aren't aware of, and it changes the math on whether you should test.

The 2017 study found that homes built in 1992 or later contained significantly higher radon levels than older Calgary homes. From the published abstract: "Homes built in 1992 or later contained significantly higher radon levels than older homes, signifying an increasing public health hazard." (source)

This runs counter to most homeowners' intuition (newer = better, tighter, more carefully built). For radon specifically, several modern construction trends pull the wrong direction:

  • Tighter building envelopes. Newer homes are built to reduce uncontrolled air leakage — great for energy bills, but it also reduces the dilution of indoor radon by outdoor air.
  • Larger floor plates. Bigger foundations cover more soil contact area = more potential entry points for soil gas.
  • Larger and more habitable basements. Newer homes often have full-height finished basements used as living space (home offices, bedrooms, gyms, kids' play areas) — concentrating occupant exposure in the highest-radon part of the home.
  • HRV/ERV systems run intermittently. Modern heat-recovery ventilators provide controlled air exchange, but they're often run on schedules that don't fully compensate for the loss of natural air leakage.

What this means for Calgary homeowners: the assumption that "my house is newer so it's probably fine" is the opposite of what the published Calgary data shows. If anything, owners of homes built since the early 1990s have a stronger reason to test than owners of older Calgary homes.

Order your $89 long-term radon test kit →

What to do as a Calgary homeowner

The action item is the same as for any Canadian homeowner, just with more local urgency: test your home with a long-term radon test, and if your result is above 200 Bq/m³, mitigate.

Step 1: Test (long-term, 91+ days). The Health Canada–recommended test for a homeowner mitigation decision is a long-term alpha-track lab test, deployed for at least 91 days during the heating season (October–April in Calgary), in the lowest lived-in level of your home. The test costs $89 all-in with RadonTest.ca — kit, tracked outbound, prepaid tracked Canada Post return label, and analysis at Lex Scientific in Guelph, Ontario (a C-NRPP-listed Canadian lab).

Step 2: Read your result. Below 200 Bq/m³, no mitigation is required (Health Canada recommends retesting every 5 years). Above 200 Bq/m³, mitigation is recommended. See our How to Read Your Radon Test Results and What to Do If Your Radon Level Is Above 200 Bq/m³ guides for the post-result decision tree.

Step 3: Mitigate, if needed. A C-NRPP-certified mitigation contractor installs a sub-slab depressurization system — the standard, well-established Canadian approach — at a typical Alberta cost of $2,500–$4,500. These systems typically reduce radon by up to 95%. Find a Calgary-area C-NRPP-certified mitigator via the C-NRPP Find a Professional tool.

Step 4: Apply for the Lungs Matter grant. The Canadian Lung Association's Lungs Matter program offers up to $1,500 toward radon mitigation for eligible Canadian homeowners with a long-term test result above 200 Bq/m³ and a quote from a C-NRPP-certified mitigator. Check current eligibility on the Canadian Lung Association's site.

Step 5: Verify. Once mitigation is complete, run an independent post-mitigation test — ideally from a provider not affiliated with the mitigation company — to confirm levels are below 200 Bq/m³ and stay that way. See our Long-Term Test vs Digital Monitor comparison for ongoing-monitoring options.

Order your Calgary kit — $89 →

Local Calgary and Alberta resources

A few Calgary- and Alberta-specific resources worth knowing about:

  • City of Calgary — Radon: What You Need to Know (calgary.ca) — the City's own resource page on residential radon
  • Evict Radon National Study (evictradon.org) — the U of Calgary–led national radon research initiative; offers at-cost test kits in exchange for de-identified data participation
  • University of Calgary Radon Aware (ucalgary.ca/risk/...) — the U of C's institutional radon information page
  • Real Estate Council of Alberta (RECA) — Alberta real estate licensees are required to disclose known radon levels above 200 Bq/m³ as a "material latent defect" (RECA Property Considerations). See our Real Estate Radon Guide for the full Canadian disclosure framework.
  • Canadian Lung Association — Lungs Matter mitigation grant (lung.ca) — up to $1,500 toward mitigation for eligible Canadian homeowners
  • C-NRPP Find a Certified Professional (c-nrpp.ca) — directory of C-NRPP-certified measurement and mitigation professionals in the Calgary area

Note on Alberta building code. Alberta uses the National Building Code 2023 Alberta Edition, which requires a Level 1 radon "rough-in" (capped vent pipe through the slab + soil gas barrier + sealed perimeter) in new construction. The rough-in is infrastructure that makes future mitigation easier and cheaper — it does not actively reduce radon on its own. See our Canadian Building Codes and Radon guide for the full picture.

FAQ — Calgary-specific questions

How common is high radon in Calgary? Per the 2017 U of Calgary study (the largest published Calgary-specific dataset), about 12% of Calgary-area homes — roughly 1 in 8 — had radon levels at or above the Health Canada guideline of 200 Bq/m³. About 48% had levels at or above the WHO recommendation of 100 Bq/m³. The only way to know your specific home's level is to test it.

Why is Calgary so much higher than other Canadian cities? Three factors combine in Calgary that don't all combine elsewhere: uranium-bearing geology (the natural source of radon), a long heating season (October–April) that seals homes for most of the year, and energy-efficient construction (tighter building envelopes that retain indoor radon). See the "why" section above.

Are some Calgary neighbourhoods worse than others? The U of Calgary study's plain-language conclusion: "there is no unaffected neighbourhood." Elevated radon was found in homes across the entire surveyed Calgary region. Neighbourhood-level statistics don't substitute for a home-specific test.

Is my new home in [Auburn Bay / Mahogany / Cranston / Seton / Saddle Ridge / etc.] less prone to radon because it's newly built? Probably not — and possibly the opposite. The U of Calgary study found that homes built in 1992 or later had significantly higher radon levels than older Calgary homes. Newer construction has tighter building envelopes, larger basements, and more energy-efficient HVAC — all of which tend to increase indoor radon. New-build status is not a substitute for testing. Order a $89 kit →

Does my newer Calgary home have a radon rough-in? If your home was built under the National Building Code 2010 (Alberta adoption was staggered, but most homes built post-2014 should comply), yes — there should be a capped vent pipe stub through the basement slab. The rough-in is infrastructure for future mitigation, not active reduction. If a long-term test shows elevated radon, the rough-in makes the mitigation system easier and cheaper to activate. (Canadian Building Codes guide)

How much does radon mitigation cost in Calgary? Typical Alberta residential mitigation costs are $2,500–$4,500 for a sub-slab depressurization system installed by a C-NRPP-certified contractor. Complex homes (large basements, multiple foundation levels, walkout basements) can run higher. The Canadian Lung Association's Lungs Matter program may offset up to $1,500 of that cost for eligible homeowners. See our How Much Does Radon Mitigation Cost guide for the full breakdown.

Do I have to disclose elevated radon when I sell my Calgary home? The Real Estate Council of Alberta states that radon levels above 200 Bq/m³ are a material latent defect that must be disclosed to prospective buyers, unless mitigation has been installed and the home brought below the guideline. (RECA Property Considerations) See our full Real Estate Radon Guide for the buyer/seller/realtor/lawyer playbooks.

When is the best time of year to test in Calgary? The heating season — October through April — produces the highest indoor radon levels and is the recommended testing window per Health Canada. A long-term test (91+ days) started in early October and ending in January gives you a strong heating-season reading. Tests run outside the heating season are still valid for Tarion-type compliance (Tarion isn't an Alberta program, but the principle is the same), but the heating-season window is the most representative of your home's worst-case exposure.

Where can I find a C-NRPP-certified radon mitigator in Calgary? The C-NRPP Find a Certified Professional directory lists certified measurement and mitigation professionals by area. Calgary has a substantial certified-mitigator population.

Where can I buy a long-term radon test kit in Calgary? You can order a RadonTest.ca $89 all-in long-term kit online and receive it within a few business days anywhere in the Calgary area — kit + tracked outbound + prepaid tracked Canada Post return label + analysis at a C-NRPP-listed Canadian lab, with results delivered to your inbox. AccuStar-based kits sold through Canadian resellers and Radonova-based kits through Radon Environmental are also available; see our comparison guide for the all-in-cost differences.

Can I get the Lungs Matter $1,500 grant in Calgary? The Canadian Lung Association's Lungs Matter program offers up to $1,500 toward radon mitigation for eligible Canadian homeowners, including Albertans. You'll need a long-term test result (≥91 days) from a C-NRPP-certified test that shows your home above 200 Bq/m³, plus a quote from a C-NRPP-certified mitigator. Verify current eligibility, application process, and grant availability directly at lung.ca before relying on the program.

Test your Calgary home — $89, all in

Calgary has measurably more residential radon than the Canadian average, the U of Calgary research is unambiguous about it, and the action item is the same one any Canadian homeowner should take: a long-term radon test that produces a real lab result.

RadonTest.ca — $89 all-in (plus applicable tax). Long-term 91-day alpha-track test kit. C-NRPP-listed device. Analysed at Lex Scientific in Guelph, Ontario — Canadian lab, C-NRPP listed, ISO/IEC 17025 accredited by CALA. Tracked Canadian shipping both ways. Written lab report PDF delivered to your inbox. About 1 in 8 Calgary homes test above the Health Canada guideline; for the ones that do, the Lungs Matter grant can offset most of the mitigation cost.

Order — $89 →

Important disclaimers

Not medical, legal, or warranty advice. This article provides general health and home-testing information for Calgary homeowners drawn from publicly available materials of Health Canada, the City of Calgary, the University of Calgary, the Canadian Cancer Society, the Real Estate Council of Alberta, and the Canadian Lung Association. It is not medical advice, legal advice, or warranty advice. If you have any health concerns or are navigating a real estate transaction or warranty claim, please consult a qualified professional.

Statistics and citations. Calgary-specific statistics in this article — including the "1 in 8" / 12% above 200 Bq/m³ figure, the 126 Bq/m³ average, the 48% above 100 Bq/m³ figure, and the 15–3,441 Bq/m³ range — are taken directly from the Goodarzi et al. 2017 CMAJ Open study. Health Canada national figures are taken from the 2012 Cross-Canada Survey of Radon Concentrations in Homes and Health Canada's Radon: What You Need to Know fact sheet (2025). Both sources are updated periodically; figures reflect the published versions as of May 2026.

Local Calgary data. Statements about Calgary radon levels reflect the published U of Calgary research and the City of Calgary's own radon resource page. Radon levels can vary substantially even between adjacent homes; neighbourhood-level statistics do not substitute for a home-specific long-term test.

Mitigation cost. The $2,500–$4,500 mitigation cost range is a typical Alberta residential figure. Actual costs vary by home, foundation, complexity, and contractor. Health Canada cites mitigation reductions of more than 80%; CARST cites up to 95%.

Lungs Matter grant. Eligibility, grant amounts, and program availability for the Canadian Lung Association's Lungs Matter program may change. Verify current eligibility and application requirements directly at lung.ca before relying on the program for your mitigation budget.

Real estate disclosure. Statements about Alberta real estate radon disclosure reflect the Real Estate Council of Alberta's published Property Considerations guidance. Specific disclosure obligations for any individual transaction depend on the facts of that transaction; consult a real estate lawyer in Alberta for advice on a specific deal.

No diagnosis or treatment claims. RadonTest.ca sells radon test kits. We do not diagnose, treat, or prevent disease, and we make no claims about doing so. The relationship between radon exposure and lung cancer risk is described by Health Canada, the WHO, IARC, and the Canadian Cancer Society in materials cited throughout this article.

No warranty as to completeness. RadonTest.ca makes no warranty as to the completeness or accuracy of the information herein and accepts no liability for decisions made in reliance on this article.

Sources & further reading

Calgary-specific

Alberta-specific

Health Canada / national

National associations and grants

Related RadonTest.ca articles