Step 1
What is radon
What radon gas is, how it gets into your home, and which Canadian homes have more of it by building type, basement and community, per the 2024 survey.
Guides
Guides on radon in Canadian homes: what it is, health risks, the guideline, testing, mitigation, cost, funding, hiring and the law, each sourced and dated.
Guides are grouped by topic, with four to read first at the top, each with a one-sentence note on what it covers. Every fact inside a guide links to its source.
Start here
Step 2
How to test for radon in Canada
How long to test for radon, when to start, where to put the detector, what weakens a result, when to retest, and what Canadian data says about who tests.
Step 3
Canada's radon guideline and what your result means
Safe radon levels in Canada: 200 Bq/m³ guideline, how soon to act, what 150, near 200 or 1,000 Bq/m³ means, and how Canada compares with WHO and the US.
Step 4
Homeowner radon action plan
A step-by-step radon plan for homeowners: the first long-term test, what to do if the result is high, mitigation, the check test and the five-year retest.
Testing
Guide
Radon levels in Canada
Radon levels in Canada by region, community and building type, where they are highest, why 2024 differs from 2012, and what a city average cannot tell you.
Guide
Radon maps and data in Canada
Every public radon map for Canada, what each measures, how Nova Scotia's compares with other countries', and why none can tell you your home's level.
Guide
Radon myths
Radon myths: is radon only in basements, does granite cause it, can an air purifier or open window remove it, each checked against Canadian evidence.
Guide
Radon test kits and monitors
Radon detector and test kit types, which monitors passed C-NRPP performance testing, which Health Canada recalled, and how to check one before you buy.
Fixing it
Guide
Hiring a radon professional
How to find a C-NRPP certified radon mitigation professional and check the credential, what to ask before hiring, and who should do the follow-up test.
Guide
How radon mitigation works
How a radon mitigation system works, how much each method cuts radon, the CAN/CGSB-149.12-2024 standard, winter issues and the tests that prove it worked.
Guide
Radon certification in Canada
The four C-NRPP radon certifications, what each allows, course and exam requirements, what it costs to get and keep one, and why no province requires it.
Guide
Radon mitigation cost in Canada
Radon mitigation system cost ranges by region and source, fan running and replacement costs, retest costs, and what a Canadian contract should include.
Guide
Radon scams and red flags
Warning signs before you pay for a radon test, system or monitor: uncertified installers, recalled detectors, false low readings and what to check first.
Guide
Radon system labels
What the labels on a radon pipe, fan and pressure gauge tell you, what the 2024 CGSB standard and C-NRPP require, and provincial pipe-marking rules.
Money and the law
Guide
Radon and the law in Canada
Canada's radon guideline is not a law. What statutes, codes, tenancy and workplace rules do require about radon, and how eight peer countries compare.
Guide
Radon grants and financial help
Free and loaned radon test kits, mitigation grants, tax credits and loans in every province and territory, and the order to apply in so you stay eligible.
Guide
Radon when buying or selling a home
Radon in a Canadian home sale: when a seller must disclose, testing on a closing timeline, holdbacks, inspectors and what the evidence says about value.
Where you live
Guide
Radon in new homes
What provincial building codes require for radon in a new home, from rough-in stub to passive stack, and what new-home warranty covers if it tests high.
Guide
Radon in rentals, condos and apartments
What tenants, condo owners and landlords can do about radon, what tenancy tribunals have decided, and how apartments and whole buildings get tested.
Guide
Radon in schools and public buildings
How radon is tested and fixed in schools, day cares, care homes and public buildings, Health Canada's timelines, and who must test in each jurisdiction.
Guide
Radon in the workplace
Federal and provincial workplace radon limits, the employer's duty, what changes under SOR/2026-10 on 30 January 2027, and workers' compensation for radon.
Who it affects
Guide
Radon and older adults
Why decades in one home, more hours at home after retirement and age at diagnosis make radon matter for older Canadians, and what the evidence says.
Guide
Radon health risks
How much radon raises lung cancer risk for smokers and non-smokers in Canada, why it has no early symptoms, what else it does, and screening by province.
Guide
Radon, children and pets
What households with children or pets need to know about radon, which rooms to test first, and what the evidence on dogs and cats does and does not show.
Background
Guide
Radon glossary
Radon terms defined: becquerel, Bq/m³, testing and mitigation terms and Canadian certification abbreviations, each with its source, in English and French.
Guide
Radon in Canadian history
Who discovered radon, and what Canada did with it: the McGill work, the Elliot Lake and St. Lawrence miner studies, the Ham inquiry and compensation.
Guide
Why Canada has high radon
Geology, climate and building history behind radon in Canadian homes, what research shows about newer homes, and which explanations it does not support.