Radon is a naturally occurring radioactive gas that seeps up from the ground and can build up inside any home, no matter its age, style, or how well it's sealed. Because it's colourless and odourless, the only way to know your level is to test. Across Ontario, the Cross-Canada Radon Survey and subsequent testing programs have shown that elevated results turn up in every kind of community — urban and rural, new builds and older housing stock alike. Peel Region, which stretches from the lakeshore in Mississauga up through Brampton and into the rural hills of Caledon, sits squarely within that pattern. You can learn more about the broader provincial picture in our overview of radon in Ontario.
Local geology and construction style influence how much radon enters a home, but no neighbourhood is exempt. Two houses on the same street can have very different readings depending on the soil beneath them, the condition of the foundation, and how the home is heated and ventilated. That's exactly why Health Canada recommends every household test rather than relying on a neighbour's result.
Communities we cover in Peel Region
RadonTest.ca serves homeowners right across Peel, from dense city neighbourhoods to acreages in the north. If you live in one of these communities, our managed kit ships to your door and comes back with prepaid two-way shipping:
- Radon testing in Mississauga — including waterfront neighbourhoods like Port Credit and Streetsville
- Radon testing in Brampton
We also serve nearby Caledon, Bolton, and the surrounding rural areas of northern Peel, where homes on wells and older foundations are just as worth testing. Wherever you are in the region, the testing process is the same.
How radon testing works
Health Canada recommends a long-term test of at least 91 days, ideally spanning the heating season when homes are closed up and radon tends to accumulate. Short-term tests (a few days) are far less reliable because radon levels swing significantly from day to day and hour to hour.
The process is simple. You place the detector in the lowest level of your home that you spend time in — a finished basement, or the main floor if you don't use the basement — about one to two metres off the floor, away from drafts, exterior walls, and humidity. You leave it undisturbed for the full period, living normally, then mail it back to the lab.
Our radon test kit is built for exactly this. It includes a C-NRPP-approved detector, prepaid shipping both ways, analysis by a C-NRPP certified lab, and an emailed report with your result — plus reminders throughout the test so you never lose track of the timeline.
Health Canada's action guideline is 200 Bq/m³. This is the level at which taking steps to reduce your radon is recommended. It's important to understand that 200 Bq/m³ is not a line between acceptable and harmful — any amount of radon carries some risk, and there is no known level free of risk. The guideline simply marks the point where action makes the most sense.
What to do if your level is high
If your result comes back at or above 200 Bq/m³, don't panic — radon problems are fixable, and a high reading is far better to know about than to ignore. The recommended next step is to contact a C-NRPP-certified radon mitigation professional for a quote.
Most homes are fixed with a system called sub-slab depressurization, which uses a fan and a pipe to vent radon from beneath the foundation to the outside before it enters your living space. A properly installed system typically reduces levels substantially. After mitigation, you should retest with a fresh long-term test to confirm the work brought your level down as expected.
Frequently asked questions
How do I test my Peel Region home for radon?
Health Canada recommends a long-term test of at least 91 days, ideally over the heating season. Place the detector in the lowest level you spend time in, leave it for the full period, then mail it to the lab. Our kit includes the C-NRPP-approved detector, prepaid two-way shipping, analysis by a Canadian C-NRPP certified lab, and an emailed report.
Is there an acceptable level of radon?
Any radon carries some risk, and there is no known level free of risk. Health Canada's 200 Bq/m³ is an action guideline — the point at which reducing your level is recommended — not a line between acceptable and harmful.
Where should I place the radon test kit?
In the lowest level of your home you use regularly — a finished basement, or the main floor if you don't use the basement — about one to two metres off the floor, away from drafts, exterior walls, windows, and humidity, under normal living conditions.
What do I do if my radon level is high?
At or above 200 Bq/m³, Health Canada recommends taking action. Contact a C-NRPP-certified radon mitigation professional for a quote; a properly installed system typically reduces levels substantially. Retest afterward to confirm it worked.
How much does radon mitigation cost?
Most residential systems are sub-slab depressurization, and the cost varies with the home, so get a quote from a C-NRPP-certified mitigation professional. Test first to learn whether you need one at all.
Test your Peel Region home today
Don't guess about your radon level — measure it. Order our radon test kit and get a clear, lab-analysed result for your Mississauga, Brampton, or Caledon home.