How to get a radon detector or monitor to test your home

Radon is an invisible, odourless, colourless radioactive gas formed by the natural breakdown of uranium found in soil and rocks. It’s the leading cause of lung cancer in non-smokers, and the second leading cause of lung cancer, after smoking.

There is no area in Canada that’s radon-free, and the B.C. Interior is known to have higher levels of radon in part due to our geology and soil. No level of radon is considered completely risk-free or safe.

Learn more about radon

Read The Science About Radon (BC Cancer)

The only way to know how much radon is in your home is to test. Testing is simple:

1. Get a radon detector or electronic monitor that’s been approved or reviewed by a professional Canadian organization such as the Canadian Association of Radon Scientists and Technologists (CARST).
2. Place it in the lowest level of your home where you spend on average four or more hours per day.
3. Leave detector or monitor in the same spot for the entire test period, at least 91 days for your long-term detector, or the duration of the monitor test (for example the 4-week library loan period).
4. Test during the winter (November to March). In the colder months, we tend to keep our windows closed and the heat on. This creates a “stack” effect which draws more radon out of the ground in the winter than in the warmer months. (Note, however, radon levels can also be affected higher or lower, by our heating, ventilation and air conditioning systems.)

Read Take Action on Radon’s tips for testing

When it comes to radon testing, you have a couple of options: alpha track detectors or electronic monitors.

• A detector is relatively inexpensive and is very easy to deploy. You simply open the package and let the detector sit in your home for 91 days or longer. After 91 days, you can mail the detector to the lab for analysis (most of which are in the U.S.).
• You can buy a continuous electronic monitor from retailers or online, but always check the product against a credible source such as C-NRPP or NRPP. These monitors operate on batteries or plug in. While they are more expensive, you get continuous readings 24/7 in real time on a display or via a mobile app.

We recommend these options if you’re interested in an alpha track radon detector.

1. Order a long-term detector test kit from BC Lung Foundation. The Radtrak3 Alpha Track Detector is sold for $49.99 and includes shipping to your door and lab analysis. Note that you’ll need to pay the letter envelope postage to send the detector to the lab. Results are usually available a few days after the lab receives your detector.
2. Order a long-term do-it-yourself radon test kit from one of the Canadian Association of Radon Scientists and Technologists (CARST) list of recommended do-it-yourself radon test kit suppliers, or Take Action on Radon’s list of companies. Prices vary.
3. Order a long-term radon test kit from Evict Radon and participate in their national study.
4. If you’d like to buy an electronic monitor, consult this comparison report published by the Canadian National Radon Proficiency Program (C-NRPP) to find a monitor that has passed the C-NRPP’s performance test.

Use caution when purchasing a detector elsewhere: some kits require an additional lab analysis fee (in U.S. dollars) and can take many months for a result. 

Free radon devices are available for one-time use or on loan in select areas in the Interior.

• These municipalities are participating in the 2024 Take Action on Radon 100 Test Kit Challenge:
  • Kaslo
  • Nakusp
  • Oliver
  • Regional District Central Okanagan (Registration and waitlist are now full)
  • Rock Creek / Midway
  • Rossland

To participate, homeowners must complete a sign-up form, and be able to pick up and drop off their detector in person. Detectors are available first come, first serve until supplies run out.

• Free loaner electronic monitors are available through BC Lung’s Radon Detector Library Lending Program through the Okanagan, Kootenay and Thompson-Nicola Regional Library networks. You can borrow a monitor for free for up to four weeks.

Free loaner electronic monitors like this one are available through BC Lung’s Radon Detector Library Lending Program through the Okanagan, Kootenay and Thompson-Nicola Regional Library networks.

In our next article, we’ll talk about how you can lower your radon levels in your home.

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