Radon for Canadian Renters (2026): What You Should Know, What You Can Ask, and What You Can Do

Flat-vector illustration of an apartment building with one highlighted unit window — radon information for Canadian renters

A note before you read. This article is general health and tenancy-rights information for Canadian renters, drawn from Health Canada, CARST, the BC Lung Foundation, the Canadian Environmental Law Association, the Canadian Cancer Society, and provincial residential tenancy frameworks. It is not medical, legal, or tenancy advice. Provincial residential tenancy law and tenant rights vary materially across Canada. Consult a qualified Canadian landlord-tenant lawyer or your provincial tenancy advice line in your specific province before relying on this article for any specific tenancy decision. See full disclaimers at the bottom.

Quick answer. Yes — as a Canadian renter, you can buy and place a radon test in your rental unit. The standard test is a 3-month (≥91-day) long-term alpha-track test in the lowest lived-in level of the unit (your bedroom if it's a basement suite). It costs roughly $50–$100 all-in. Health Canada's action level is 200 Bq/m³. If your test exceeds that, your landlord generally has a habitability obligation under your provincial Residential Tenancies Act to address it — typically through mitigation by a C-NRPP-certified contractor, at the landlord's cost. Document everything in writing.

If you rent your home in Canada — a basement suite, a detached rental, an apartment, a duplex, a triplex — you may have wondered whether radon is something you need to worry about, and what (if anything) you can do about it as a tenant rather than an owner. Three things every Canadian renter should know:

First, renters can test their rental for radon. A long-term radon test kit is non-invasive — it's a small plastic detector left on a shelf for 91+ days. You don't need landlord permission to test the air inside your home, though it's generally good practice to inform the landlord that you're doing so. The test costs $89 all-in with a Canadian-lab provider.

Second, Canadian landlord-tenant law generally requires landlords to maintain rental properties in a habitable condition that complies with health, safety, and housing standards. Multiple administrative tribunals across multiple provinces have ruled that radon levels above the Health Canada 200 Bq/m³ guideline can violate this habitability obligation — meaning if you test, find elevated radon, and present the documented result to your landlord, the landlord may have an obligation to address it.

Third, the radon health risk is long-term, not immediate. A high test result doesn't mean you need to move out tomorrow — Health Canada itself frames radon as a long-term lifetime-lung-cancer risk that takes years of exposure to develop, not an acute threat. You have time to understand your options, talk to your landlord, and (if needed) consult a qualified provincial landlord-tenant lawyer.

This guide walks through what radon is and why renters should care, how renters can test their rental, what your landlord's obligations likely are, what to do if your rental tests above 200 Bq/m³, and the special considerations for basement suites and apartments.

TL;DR for Canadian renters

  • Renters can test their rental for radon themselves — a long-term test kit is non-invasive and costs $89 all-in. Telling your landlord you're testing is good practice but generally not legally required.
  • Canadian landlords generally must maintain rental units in a "habitable" condition — and administrative tribunals have ruled that radon levels above the Health Canada 200 Bq/m³ guideline can violate this obligation.
  • Document the result with a lab report from a C-NRPP-listed Canadian lab. That's the document that supports any tenancy-board proceeding or formal landlord communication.
  • Basement suites have higher radon than upper-floor apartments. Renters in basement suites have particularly elevated exposure concerns. Order a $89 long-term radon test kit →
  • The radon health risk is long-term, not immediate. You have time to understand your options before deciding what to do.

Table of contents

  1. Why renters should care about radon
  2. Can renters test their rental for radon?
  3. Should you tell your landlord before you test?
  4. What your landlord's obligations likely are
  5. What to do if your rental tests above 200 Bq/m³
  6. Basement suites — special considerations
  7. Apartments and condos — special considerations
  8. FAQ
  9. Disclaimers
  10. Sources

Why renters should care about radon

The reflexive renter assumption is "I'm renting, so it's the landlord's problem." For radon specifically, that's only partly true — the long-term lung cancer risk is incurred by whoever lives in the home, not whoever owns it. A renter living for 5–10 years in a high-radon basement suite carries a meaningful share of the lifetime exposure that produces radon-induced lung cancer. The home's owner doesn't bear that exposure (unless they live there).

Three Health Canada–established facts that put this in perspective:

  • Radon is the leading cause of lung cancer in Canadians who have never smoked, and the second leading cause overall after smoking. (Health Canada — Radon: What You Need to Know)
  • About 1 in 5 Canadian homes has radon levels above the Health Canada 200 Bq/m³ guideline.
  • The health risk is long-term, not immediate — radon doesn't make anyone "sick" today. The risk is accumulated lifetime lung cancer probability over years of exposure.

For renters, this matters most in three categories:

  1. Long-term renters in the same property. Any year of elevated exposure adds to lifetime risk; a renter staying 5+ years in a high-radon home is incurring exposure comparable to a homeowner.
  2. Basement suite renters. Basements have higher radon than upper floors (see our basements article). Basement suite renters live in the highest-radon part of the house — often without a homeowner above them sharing exposure with them.
  3. Renters with children. Children breathe more rapidly relative to body size and have many decades of remaining life expectancy. Long-term radon exposure beginning in childhood compounds over a longer time horizon.

The takeaway for renters: the radon question matters to you specifically, regardless of who owns the property. And as the next section explains, you have more options than most renters realize.

Order a $89 long-term radon test kit →

Can renters test their rental for radon?

Yes. A long-term radon test kit is non-invasive — it's a small plastic detector you leave on a shelf or table in the home for 91+ days. Testing the air inside your home does not require landlord permission in any Canadian province (testing the air is not a structural alteration to the property, doesn't damage anything, and doesn't affect the landlord's interests during the test period).

That said, it's good practice to inform the landlord that you're testing, for several reasons:

  • It demonstrates good faith — you're not taking adversarial action; you're addressing a legitimate health concern that affects you as the occupant.
  • It can prompt the landlord to handle the testing themselves (which would mean the landlord pays the testing cost rather than you).
  • It documents your reasonable conduct if the result is elevated and the situation escalates to a tenancy proceeding.
  • It opens dialogue early — the landlord may already have testing results from before you moved in, may be open to splitting the cost, or may want to coordinate testing across multiple units.

A simple emailed message to the landlord might read: "Hi [landlord], I'm planning to test the rental unit for radon over the next 91+ days. Radon is a naturally occurring radioactive gas that Health Canada recommends every Canadian home be tested for. I've ordered a long-term test kit; the test will run from [date] to approximately [date+91 days]. The detector is non-invasive — it just sits on a shelf. I'll share the lab report with you when it's complete. Let me know if you have questions."

If you don't want to tell the landlord — and there are some scenarios where renters reasonably prefer privacy until they have results — you don't legally have to. But once you have a result, especially an elevated one, the question of what to do with it becomes the relevant question (covered below).

Should you tell your landlord before you test?

Most landlord-tenant lawyers and tenant advocates would suggest yes, with discretion. The benefits described above (good faith, opening dialogue, possibly shifting the testing cost to the landlord) generally outweigh the downsides. The only common scenario where renters reasonably delay informing the landlord is if the rental relationship is already adversarial (existing repair disputes, rent disputes, or a landlord history of retaliating against tenants who raise issues).

In any case: you cannot legally be evicted, have your rent raised, or be retaliated against for testing your rental for radon or for raising radon concerns — provincial tenancy law in every Canadian province prohibits retaliatory landlord actions. If you experience adverse landlord actions in response to raising a legitimate health concern, that's grounds for a tenancy board complaint in itself.

For specific guidance on landlord-tenant communication in your province, contact your provincial tenancy advice line — every Canadian province operates a free or low-cost tenant information service.

What your landlord's obligations likely are

Every Canadian province and territory has residential tenancy legislation requiring landlords to maintain rental units in a "habitable" condition that complies with health, safety, and housing standards. The exact wording varies by province, but the substance is consistent. Ontario's Residential Tenancies Act, 2006 requires "good state of repair and fit for habitation"; BC's Residential Tenancy Act requires compliance with "health, safety, and housing standards"; Quebec's Code civil requires the dwelling to be delivered and maintained "in good habitable condition." Comparable obligations apply in every other province.

Where radon comes in. The Canadian Environmental Law Association's 2019 academic review of Canadian radon law summarizes the situation:

"All Canadian provinces and territories have landlord-tenant legislation requiring rental accommodation be habitable and in good repair, with administrative decision makers ruling that provisions are violated by radon levels over Health Canada Guidelines." (CELA, 2019)

Practical implications for renters with a documented elevated test result:

  • The landlord likely has an obligation to address the situation under the general habitability standard.
  • Provincial residential tenancy boards can hear tenant complaints about the landlord's failure to address habitability issues.
  • Outcomes vary by province and the strength of the tenant's evidence. A long-term lab-analyzed test result on letterhead from a C-NRPP-certified Canadian lab is much stronger evidence than a phone-app screenshot.
  • Tenancy boards can order: landlord-arranged mitigation, retroactive rent abatement, lease termination without penalty, or other remedies depending on the province.

Important — get qualified provincial-specific advice. This article is general information. The specific tenant rights and remedies in your situation depend on:

  • Your province's residential tenancy legislation
  • The specific facts of your tenancy (lease terms, length of tenancy, history of communication)
  • The strength of your test documentation
  • The current state of your provincial tenancy board's case law on radon

Before initiating a formal tenancy proceeding, consult a qualified landlord-tenant lawyer in your province or contact your provincial tenancy advice line.

Order your $89 long-term radon test kit →

What to do if your rental tests above 200 Bq/m³

Don't panic. Health Canada's guidance is clear: the radon health risk is long-term, not immediate. You don't need to move out today. You have time to understand your options and decide what to do. Here's a practical sequence:

Step 1: Verify the result if needed

A single 91-day test is usually sufficient to make a decision. If the result is well above the guideline (300+ Bq/m³), it's reliable. If you're at the borderline (180–220 Bq/m³), you can either trust the single test or run a second long-term test in a subsequent heating season to confirm.

Step 2: Share the result with your landlord, in writing

A documented lab report PDF, sent by email, is the cleanest format. A simple message:

"Hi [landlord], the long-term radon test I mentioned [or: the radon test I ran on the unit] came back above the Health Canada guideline of 200 Bq/m³ — the result was [X] Bq/m³. The lab report is attached. Health Canada recommends mitigation for results above 200 Bq/m³. As [landlord/property owner], please let me know your plan to address this. Happy to discuss."

The lab report PDF is the document that:

  • Triggers any landlord obligation to act under the habitability framework
  • Becomes evidence if a tenancy proceeding is needed
  • Documents your reasonable conduct in raising the concern

Step 3: Give the landlord reasonable time to respond

Most landlords will respond constructively to a documented test result — testing and mitigation are well-understood, the cost is manageable ($2,500–$4,500 for a typical Canadian residential mitigation), and the landlord likely understands that not addressing it creates downstream risk.

If the landlord proposes a path (arrange mitigation by a C-NRPP-certified contractor, possibly with the Canadian Lung Association's Lungs Matter $1,500 grant or provincial financing), accept that path. Document everything in writing.

If the landlord refuses to act, ignores the request, or proposes inappropriate measures (e.g., "just open the windows," "we're not going to do that"), the situation moves to the next step.

Step 4: If the landlord refuses to act — provincial tenancy board

In every Canadian province, residential tenants can file complaints with the provincial residential tenancy board (Ontario LTB, BC RTB, Alberta RTDRS, Quebec TAL, etc.) when the landlord fails to comply with the habitability standard. Before filing, contact your provincial tenancy advice line for free guidance on the process and likely outcomes.

The general process:

  • File a written complaint with the appropriate provincial tenancy board, attaching your radon lab report and documentation of your communication with the landlord
  • The board will typically schedule a hearing (timing varies by province — can be weeks to months)
  • The board may order: landlord-arranged mitigation, rent abatement (often retroactive to when the landlord was first informed), lease termination without penalty, or other remedies
  • Outcomes vary by province and case facts

Step 5: While the situation resolves — consider what you can do in the meantime

While longer-term resolution is in process, there are things renters can do to reduce day-to-day exposure:

  • Spend less time in the highest-radon parts of the home (typically the basement, lowest level, or any specific room where the test was high)
  • Increase ventilation when practical (open windows when weather permits, run HRV/ERV systems, run bathroom and kitchen fans)
  • Don't smoke indoors — the combination of smoking and elevated radon dramatically increases lung cancer risk
  • Consider continuous monitoring — a C-NRPP-approved digital radon monitor can give you real-time visibility into how your day-to-day exposure varies; useful for short-term reassurance pending mitigation

These are interim mitigations, not substitutes for proper sub-slab depressurization. But they can meaningfully reduce exposure in the weeks-to-months window before mitigation is installed.

Basement suites — special considerations

If you rent a basement suite (or a daylight/walkout basement apartment), you have a few specific considerations:

Basements have measurably higher radon than upper floors. Often 2–5× higher than the main floor of the same home. The reason isn't that "radon sinks" — it's the combination of proximity to the soil source, the stack effect (warm air rising creates negative pressure at the lowest level), and reduced air exchange. See our Radon in Basements guide for the full physics.

Your landlord likely lives upstairs (or owns the upper unit). This means the landlord's personal exposure to whatever radon is in the basement is much lower than yours. A landlord in this situation may not have personally noticed or cared about radon in the basement — testing is the way to make the situation visible.

Basement suite tenants have particularly clear habitability standing. A basement suite that tests above 200 Bq/m³ is a habitability issue specifically for the unit you rent. The landlord can't reasonably argue "but the upstairs is fine" — the unit you rent is the unit that has to meet the standard.

Mitigation is straightforward and effective. Sub-slab depressurization in a basement suite typically costs $2,500–$4,500 and reduces radon by up to 95% (Health Canada cites reductions of more than 80%; CARST cites up to 95%). The mitigation system is installed in your unit but the cost and contracting is the landlord's responsibility (under the habitability obligation).

For basement suite renters, proactive testing is especially worthwhile. A $89 test now answers a question that might otherwise go unaddressed for years.

Order your basement suite test kit — $89 →

Apartments and condos — special considerations

If you rent an apartment in a multi-unit building, your radon situation is somewhat different:

Upper-floor apartments typically have lower radon than ground-floor units. Radon enters through soil contact at the lowest level of the building. Upper floors are more separated from the soil source (and have less stack-effect-driven soil gas intrusion in their immediate space). This is broadly true, though specific building construction (basement parkades, mechanical rooms, central HVAC) can affect specific units.

Ground-floor apartments and basement-level units in apartment buildings have more potential exposure — similar dynamics to single-family basements.

Common-area testing matters. If your apartment building has a basement parkade, gym, storage area, or common laundry that you use, those areas can have elevated radon even if your specific unit doesn't. Testing your specific unit is the right starting point for your personal exposure.

The landlord/property management situation is different. In an apartment building, the property management company (or the building's owner) is the relevant counterparty for habitability issues, not an individual landlord. The same general framework applies (Canadian provincial tenancy law requires habitability), but the conversation flow is different — it typically goes through the building's property management office.

Condo rentals have an extra layer. If you rent a condo unit (where the unit owner is your landlord but the condo corporation owns the building), some radon issues may need to involve the condo corporation as well as your unit owner — particularly anything involving common-area mitigation. For condo rental tenancy issues specifically, consult a qualified provincial landlord-tenant lawyer.

FAQ

Can I test my rental for radon without my landlord's permission? Yes. A long-term radon test kit is non-invasive — it's a small plastic detector left on a shelf for 91+ days. Testing the air inside your home does not require landlord permission in any Canadian province. That said, good practice is to inform the landlord that you're testing for the reasons described above.

Is my landlord required to fix elevated radon? Likely yes, under the general habitability obligation that applies in every Canadian province. Multiple administrative tribunals have ruled that radon levels above the Health Canada 200 Bq/m³ guideline can violate the habitability standard. (CELA, 2019) The specific landlord obligation in your situation depends on your province's tenancy law and the facts of your tenancy — consult a qualified provincial landlord-tenant lawyer.

Can my landlord evict me for testing or raising radon concerns? No. Provincial tenancy law in every Canadian province prohibits retaliatory landlord actions against tenants who raise legitimate health, safety, or repair concerns. Retaliatory eviction or rent increases following a tenant's radon complaint would itself be grounds for a tenancy board complaint.

My rental tested at 350 Bq/m³. Should I move out? Not necessarily — and not immediately. The radon health risk is long-term, not immediate (Health Canada is explicit on this). You have time to share the result with your landlord, give them reasonable time to respond, and pursue tenancy-board proceedings if needed. Mitigation (which would be the landlord's responsibility under the habitability framework) typically reduces radon by up to 95% at a cost of $2,500–$4,500 — meaningful, but not insurmountable. Most situations are resolved through landlord-arranged mitigation rather than tenant relocation.

My rental tested at 220 Bq/m³ — borderline above. Is that worth pursuing? Yes. The Health Canada guideline is 200 Bq/m³, and 220 is above it. The strength of your habitability case under provincial tenancy law generally tracks the published guideline, not your subjective sense of "how bad" the result feels. Document the result, share it with the landlord, and have the conversation.

Can I withhold rent because of high radon? Generally no — Canadian provincial tenancy law usually doesn't allow tenants to unilaterally withhold rent. The proper path is to document the issue, raise it with the landlord, and (if unresolved) file a complaint with the provincial residential tenancy board. Tenancy boards can order rent abatement retroactively if they find the landlord violated the habitability obligation, but the process needs to go through the board, not unilateral rent reduction. Consult a qualified provincial landlord-tenant lawyer or your provincial tenancy advice line for guidance specific to your province.

What if my landlord just opens windows or installs a fan instead of proper mitigation? Opening windows reduces radon temporarily but isn't a year-round solution in Canadian winters. A standard "exhaust fan" isn't proper radon mitigation either. Proper Canadian radon mitigation is sub-slab depressurization installed by a C-NRPP-certified contractor — the system actively pulls soil gas out from under the foundation. If the landlord proposes inadequate measures and a follow-up test still shows elevated radon, you have grounds to escalate.

Where can I buy a long-term radon test kit? RadonTest.ca offers a $89 all-in long-term kit — kit + tracked outbound + prepaid tracked Canada Post return label + analysis at a C-NRPP-listed Canadian lab. Lab report PDF delivered to your inbox after analysis. The kit is delivered to your rental address; you don't need landlord involvement to order or receive it.

My basement suite rental has high radon and my landlord lives upstairs. They say it doesn't affect them. What's my position? Strong. The unit you rent is the unit that has to meet the habitability standard. The landlord can't reasonably argue that their unit being fine excuses your unit being above the guideline. Consult a qualified provincial landlord-tenant lawyer — basement suite tenants have particularly clear habitability standing because the unit being rented is the unit with the issue.

I'm renting an apartment on the 12th floor. Do I need to test? Upper-floor apartments typically have lower radon than ground-floor or basement units, but individual buildings vary based on construction (basement parkades, mechanical rooms, central HVAC routing). Testing your specific unit confirms — if you spend a lot of time at home, the cost-benefit is strong even at lower expected risk. Order a kit →

Where can I get free or low-cost provincial tenancy advice? Every Canadian province operates a tenancy advice service — typically free or low-cost. A few examples (verify current contact info):

  • Ontario: Landlord and Tenant Board (LTB), various community legal clinics
  • BC: Tenant Resource and Advisory Centre (TRAC), Residential Tenancy Branch
  • Alberta: Centre for Public Legal Education Alberta (CPLEA), RTDRS
  • Quebec: Tribunal administratif du logement (TAL)
  • Other provinces: search "[province] tenancy advice" or "[province] tenant rights"

Test your rental — $89, all in, no landlord involvement required

The single most useful thing a Canadian renter can do about radon is order a $89 long-term test kit, place the detector in your rental for 91+ days, mail it back, and read the result. From there, you have the documented information you need to act — whether that's "the result is fine and I can stop wondering" or "the result is elevated and the landlord needs to address this."

RadonTest.ca — $89 all-in (plus applicable tax). Long-term 91-day alpha-track test kit. C-NRPP-listed device. Analysed at Lex Scientific in Guelph, Ontario — Canadian lab, C-NRPP listed, ISO/IEC 17025 accredited by CALA. Tracked Canadian shipping both ways. Written lab report PDF delivered to your inbox.

Order — $89 →

Important disclaimers

Not medical, legal, or tenancy advice. This article provides general health and tenancy-rights information for Canadian renters drawn from publicly available Health Canada, CARST, BC Lung Foundation, Canadian Environmental Law Association, Canadian Cancer Society, and provincial residential tenancy framework materials. It is not medical advice, legal advice, or tenancy advice and is not a substitute for advice from a qualified Canadian landlord-tenant lawyer or a qualified provincial tenancy advice service. Provincial residential tenancy law and tenant rights vary materially across Canada. Consult a qualified Canadian landlord-tenant lawyer in your specific province before relying on this article for any specific tenancy decision, particularly before initiating a formal tenancy proceeding.

Statistics and citations. Statements about Canadian provincial habitability frameworks reflect publicly available provincial residential tenancy legislation and the Canadian Environmental Law Association's 2019 Environmental Scan of Radon Law and Policy. Statements about administrative tribunal decisions reflect the CELA report's published characterization. Specific outcomes in any individual tenancy proceeding depend on the facts and on the applicable provincial framework at the time of the proceeding.

Health Canada citations. Statements about radon levels, the 200 Bq/m³ guideline, and the long-term-not-immediate health risk framing reflect Health Canada's Radon: What You Need to Know fact sheet (2025). Sources update published figures periodically.

Mitigation cost. The $2,500–$4,500 mitigation cost range is a typical Canadian residential figure. Actual costs vary by property, foundation, complexity, and contractor. Health Canada cites mitigation reductions of more than 80%; CARST cites up to 95%.

Provincial tenancy advice. This article does not constitute tenancy advice for any specific province. Tenants seeking specific guidance should consult a qualified provincial landlord-tenant lawyer or contact their provincial tenancy advice line.

No diagnosis or treatment claims. RadonTest.ca sells radon test kits. We do not diagnose, treat, or prevent disease.

No warranty as to completeness. RadonTest.ca makes no warranty as to the completeness or accuracy of the information herein and accepts no liability for decisions made in reliance on this article.

Sources & further reading

Tenant rights and Canadian radon law

Health Canada / national

Canadian associations

Related RadonTest.ca articles