Radon in Canada: What Every Homeowner Should Know
- May 19
- 3 min read
Radon is something most homeowners never see, smell, or think about — yet it is one of the most important indoor air quality issues in Canada. As awareness continues to grow, more families are discovering that radon testing is not just a recommendation, but an important step toward protecting long-term health.
At Radon Montreal, we help homeowners understand the risks of radon gas, test their homes properly, and reduce elevated levels safely and effectively.
What Is Radon?
Radon is a naturally occurring radioactive gas created by the breakdown of uranium in soil and rock. Outdoors, it usually disperses harmlessly into the air. Indoors, however, radon can accumulate to dangerous levels.
Because radon is invisible, odorless, and tasteless, the only way to know if your home has elevated levels is to test for it.
How Does Radon Enter a Home?
Radon enters buildings from the ground beneath them. Any home with contact to the soil can have radon. Common entry points include:
Cracks in foundation walls or floors
Gaps around pipes or drains
Sump pits
Crawl spaces
Construction joints
Even newer homes can have elevated radon levels due to modern energy-efficient construction trapping indoor air more tightly.
Why Radon Matters
Health Canada identifies radon exposure as the leading cause of lung cancer in non-smokers and the second leading cause overall after smoking.
Radon is present in every home in Canada
Long-term exposure increases lung cancer risk
More than 3,000 lung cancer deaths in Canada each year are linked to radon exposure
Smokers exposed to radon face an even greater risk
The risk comes from prolonged exposure over time, not short-term exposure. That is why testing is so important — especially in basements and lower living areas where radon levels are often highest.
What Is the Recommended Radon Action Level in Canada?
Health Canada’s guideline is:
200 Bq/m3,
Homes above 200 Bq/m³ should take action to reduce radon levels. Even below that guideline, Health Canada states that no radon level is completely risk-free.
How to Test Your Home for Radon
The most reliable method is a long-term radon test lasting at least 3 months, typically during the colder months when windows remain closed.
Homeowners can:
Purchase a certified radon test kit
Hire a certified radon measurement professional
Resources such as Test4Radon.ca and Take Action on Radon help Canadians understand testing options and radon safety recommendations.
Can Radon Be Reduced?
Yes. Elevated radon levels can usually be reduced effectively through professional mitigation systems.
The most common mitigation method is called sub-slab depressurization, which uses a specialized fan and piping system to safely vent radon gas outside before it enters the home. Properly installed systems can dramatically reduce indoor radon levels.
Every Home Should Be Tested
One of the biggest misconceptions about radon is that only older homes or homes in certain areas are affected. In reality:
Two neighbouring homes can have completely different radon levels
New and old homes can both test high
Renovations and insulation upgrades can change indoor radon levels
The only way to know your level is to test.
Protect Your Family With Radon Testing
Testing your home is simple, affordable, and one of the most important steps you can take for your family’s long-term health.
At Radon Montreal, we provide professional radon testing and mitigation services throughout the Montreal region. Whether you are buying a home, renovating, or simply want peace of mind, our team can help you understand your radon levels and the best next steps.
Comments