Radon in Edmonton: Levels, Risks & What to Do

Of Canada's six largest metropolitan areas, Edmonton has the highest average indoor radon concentration. The city-wide average sits at 106.4 Bq/m³, roughly four times the national average of about 25 Bq/m³, and about 1 in 6 Edmonton homes exceeds Health Canada's action level of 200 Bq/m³. If you own a home in Edmonton and haven't tested, this is worth reading.

How Edmonton compares to other Canadian cities

The Cross-Canada Radon Survey, which tracked radon levels across Canada's largest metropolitan areas, puts Edmonton at the top of the list. For context:

Vancouver's numbers reflect coastal geology with lower uranium concentrations. Edmonton's reflect the opposite. The Prairie provinces sit on some of the most radon-prone geology in the world, and Edmonton is squarely in that zone.

Being above the national average doesn't automatically put your home at risk, but it does mean the odds are meaningfully stacked differently here than they would be if you lived in Vancouver or Toronto.

Why Edmonton has so much radon

Two things drive Edmonton's numbers: what's under the ground and how long residents spend inside.

The city sits on glacial and sediment-heavy soils with elevated uranium concentrations. As uranium decays naturally in the soil, it produces radon gas that migrates upward into homes through foundation cracks, floor drains, sump pits, and construction joints. The geology of the Western Canadian Prairies produces more of this gas than most regions in Canada.

The cold climate compounds it. Edmonton winters are long. Homes stay sealed from roughly October through April, sometimes longer. During those months, radon that enters a home has fewer ways to escape, so concentrations build up. A home that might test at 150 Bq/m³ in summer could test significantly higher during heating season when windows are shut for months at a time.

This is why Health Canada recommends running long-term tests during the heating season rather than in summer, and why Edmonton's real radon exposure is often higher than a quick test might suggest.

Your home's level can't be predicted from your neighbourhood

Edmonton's average is a useful starting point, but it tells you nothing specific about your house. Two homes on the same street, with similar construction, can test at completely different levels. What matters most is what's directly beneath your particular foundation: the permeability of the soil, how many entry points exist, and how well sealed the house is.

Old houses and new ones both show elevated radon in Edmonton. A 1960s bungalow with a crumbling foundation has obvious entry points, but a tightly built 2018 home can actually accumulate higher concentrations because there's nowhere for gas to escape once it's inside. Tighter construction works against you when it comes to radon.

The only way to know your home's level is to test it.

How to test your Edmonton home

Health Canada recommends a long-term alpha track test: a small passive device placed in the lowest livable area of your home for at least 91 days. October through April is the ideal window since your home is sealed and radon is at its highest concentration.

Option 1: Mail-in test kit (~$30 to $60)

The most accurate approach for making a mitigation decision. Place the device in your finished basement or lowest regularly used floor, leave it for 91 days or more, then mail it to the lab. Results come back within a couple of weeks. This is what Health Canada recommends before committing to mitigation.

Option 2: Electronic continuous monitor (~$160 to $350)

Devices like the Airthings Corentium Home, Aranet RN+, or Ecosense RadonEye give you live readings and track levels over time. C-NRPP approved models are accurate enough for mitigation decisions if you leave them in place for at least 90 days and read the long-term average rather than the hourly reading.

Place your test device on the lowest floor where people spend regular time, away from windows, vents, and exterior walls. Don't move it during the test.

For a full walkthrough of test placement and timing: How to test your home for radon.

What to do with your result

Given Edmonton's city-wide average of 106 Bq/m³, many homeowners will find results in the 100 to 200 range. That's not a crisis, but it's worth taking seriously, particularly if you have children, are a smoker, or if your family spends significant time in the basement.

If you test above 200 Bq/m³, the standard fix is sub-slab depressurization. A certified contractor drills through your foundation slab, routes PVC pipe upward through or around the home, and connects it to a fan that runs continuously. The fan creates negative pressure beneath your slab, pulling radon out before it enters the living space and venting it outside. A well-installed system reduces indoor radon by 80 to 99% and is typically done in one day.

For more detail on interpreting your specific result: How to interpret your radon test results.

What radon mitigation costs in Edmonton

Edmonton sits at the higher end of the national cost range, reflecting Alberta's labour market and the complexity that comes with many older Edmonton homes.

• Standard sub-slab depressurization: $2,000 to $3,500
• Complex configurations (finished basements, multiple suction points, difficult pipe routing): up to $4,500
• Post-mitigation re-test: $30 to $60 (do this 30 to 90 days after installation to confirm the system is working)

Get quotes from at least two certified professionals. Every quote should include a post-installation test or clear instructions on how to arrange one. A contractor who installs a system and doesn't verify the result isn't giving you a complete job.

For a full cost breakdown: How much does radon testing and mitigation cost in Canada?

Radon and Edmonton real estate

Radon testing in Edmonton real estate transactions is becoming more common as awareness grows. Given the city's position as the highest-radon major metropolitan area in Canada, including a radon test as a purchase condition is reasonable for any Edmonton home, and particularly for older homes with basements.

If you're buying in Edmonton, request a radon test as part of your inspection conditions. If the result comes back above 200 Bq/m³, you can negotiate mitigation costs with the seller or walk away. Sellers who have already tested and mitigated are in a strong position: documented mitigation is a selling feature in a city where buyers are increasingly radon-aware.

More on handling radon in a real estate transaction: Radon and real estate in Canada.

Find a certified radon professional in Edmonton

All professionals listed on RadonFinder.ca hold active C-NRPP certification, the standard recognized by Health Canada for radon testing and mitigation in Canada.

Browse certified radon professionals serving Edmonton

When you contact a contractor, ask whether they're certified for both testing and mitigation (certifications are separate), whether post-mitigation testing is included in the quote, and what warranty they offer on the installed system.

The bottom line

Edmonton consistently ranks as the highest-radon major city in Canada. That's not a reason to panic, but it is a reason to test. A long-term kit costs $30 to $60 and takes 91 days. If your result is elevated, the fix works, it lasts, and it can usually be done in a day.

• Browse DIY radon test kits and monitors
• Find a certified radon professional in Edmonton
• See how Alberta compares to other provinces