A note before you read. This is general consumer information for Prince Edward Island homeowners, buyers, sellers, landlords, and renters, drawn from publicly available Health Canada, the Government of PEI, LungNSPEI, and other sources. It is not medical, legal, or warranty advice. Radon results are reported against the Health Canada guideline of 200 Bq/m³; RadonTest.ca coordinates testing logistics and does not interpret individual results or provide health assessments.
Key facts: radon in PEI at a glance
- PEI has the lowest radon prevalence of any province in Canada. Health Canada's 2012 survey found about 3.5% of PEI homes above the 200 Bq/m³ guideline — the lowest provincial figure in the country.
- Low is not zero. Individual PEI homes still test high (one Stratford home made the news for "off-the-charts" levels), and there's no way to know yours without testing.
- Radon is the number one cause of lung cancer in non-smokers — about 16% of lung-cancer deaths in Canada, more than 3,000 a year.
- The Health Canada guideline is 200 Bq/m³ (annual average). Above it, Health Canada recommends acting within one year — sooner the higher the level.
- PEI has tested radon in all of its public schools — a program running since 2008, with recent (2023–24) results all below the guideline.
- A valid test takes at least 91 days (about three months). Free test kits are available to borrow from the PEI Provincial Library Service, and fixing a home usually costs in the low thousands.
How much radon is in PEI homes?
Radon is a naturally occurring radioactive gas — colourless, odourless, tasteless — produced as uranium in soil and rock breaks down, then seeping indoors. Prince Edward Island is the good-news story among provinces: it has the lowest radon prevalence in Canada.
- Health Canada's Cross-Canada Survey (2012) found about 3.5% of PEI homes above the 200 Bq/m³ guideline (with an average around 96 Bq/m³) — the lowest of any province, which Health Canada attributed alongside Nunavut as the lowest in the country.
- The 2024 Cross-Canada Radon Survey reports the Atlantic region as a whole at roughly 1 in 3 homes above the guideline — but that figure is dominated by higher-radon New Brunswick, Nova Scotia, and Newfoundland, and the survey does not publish a PEI-specific number. It would be wrong to apply the regional "1 in 3" to PEI, whose own measured prevalence is far lower.
So PEI's risk is genuinely lower than most of Canada — but lower is not none. Health Canada is clear that no level of radon is risk-free, and that any home can test high regardless of the local average. (For the national picture, see radon levels by province.)
What this means for you: a provincial average can't tell you about your house. Two homes on the same street can read very differently depending on soil, foundation, and ventilation. A long-term test is the only way to know your own number — and PEI homeowners are among the most radon-aware in Canada, but among the least likely to have actually tested.
(No published Charlottetown-specific prevalence figure exists — PEI's small population means the data is reported province-wide rather than by city.)
Find your city: see our local guide for Charlottetown.
Why PEI's radon is low: the geology
Radon levels track the amount of uranium in the ground beneath a home. Prince Edward Island sits almost entirely on soft, reddish sedimentary sandstone and mudstone (Permo-Carboniferous "red beds") that are naturally low in uranium — and quartz-rich marine sandstones are among the rock types least likely to produce a radon problem. That geology is the main reason PEI's prevalence is the lowest in the country. It's a general principle rather than a PEI-government statement, but it's well established — and, as everywhere, it describes the average, not your specific home, which depends on local soil, cracks, and how the house is built and ventilated.
Is radon dangerous? The health risk
Radon is classified by the International Agency for Research on Cancer as a Group 1 carcinogen — the highest category, alongside tobacco smoke and asbestos. Health Canada's current figures:
- Radon is the number one cause of lung cancer in non-smokers, and the second leading cause overall after smoking.
- About 16% of lung-cancer deaths in Canada are estimated to be radon-related — more than 3,000 a year.
- Health Canada estimates a non-smoker exposed to high radon over a lifetime has roughly a 1 in 20 chance of developing lung cancer from it; for a smoker, the combined risk rises to about 1 in 3.
There's no published PEI-specific radon death estimate (the province is too small for a reliable province-level figure), so these national numbers are the best guide. Health Canada frames the risk proportionately, and so do we: there is no level of radon that is completely risk-free, the risk below the guideline is small, and it is ultimately each homeowner's choice what level of exposure they are willing to accept. The point isn't alarm — even in a low-prevalence province, radon is worth a simple, inexpensive test. (To separate fact from fiction, see our top radon misconceptions.)
The Health Canada guideline — and what your number means
Canada's guideline is 200 becquerels per cubic metre (Bq/m³), measured as an annual average in a normally occupied area of the home. It's a health-based guideline, not a hard legal limit for private homes. Health Canada's guidance:
- At or above 200 Bq/m³: take corrective action to reduce the level, within one year — and sooner the higher the result.
- Below 200 Bq/m³: no corrective action is recommended, though no level is risk-free; some households (especially where someone smokes) choose to act toward the WHO's more protective 100 Bq/m³ reference level.
Your result is a concentration, not a pass/fail — it sits on a spectrum. For what each range means, see how to read your radon test results and our comparison of the Health Canada, WHO, and US thresholds.
How to test for radon in PEI
Even in Canada's lowest-prevalence province, testing is the only way to know your own home's level:
- Use a long-term test of at least 91 days (about three months). Radon swings day to day and season to season; a 91+ day average reflects your real exposure. Short-term tests are only for checking a mitigation system, never for deciding whether to act.
- The heating season (roughly October–April) is ideal, because Health Canada recommends that at least 91 days of the test fall within it; a test that runs largely outside the heating season can underestimate your annual average.
- Place the detector in the lowest lived-in level (often the basement if it's used), in a room occupied more than four hours a day, about 30 cm off the floor and away from drafts, vents, and direct sun. Not the kitchen, bathroom, or laundry room.
- Use a C-NRPP-approved test. RadonTest.ca kits use an alpha-track detector analysed by a C-NRPP-certified laboratory. (For how long-term kits compare with continuous digital monitors, see our guide.)
Where to get your test: order a RadonTest.ca kit — the detector, analysis by a C-NRPP-certified laboratory (with an all-in-Canada analysis option), tracked shipping both ways, and your result delivered with clear Health Canada context are all included. (Free test kits can also be borrowed from the PEI Provincial Library Service.) One caution about cheaper retail kits: not every hardware-store kit is analysed by a C-NRPP-certified lab — see our comparison of hardware-store radon test kits.
When to retest. Health Canada recommends testing again after any renovation that affects your home's structure or ventilation, after energy retrofits, or after excavation near the foundation; and every five years if you have a mitigation system, to confirm it's still working. (See when is radon testing season in Canada.)
If your radon is high: mitigation in PEI
A high reading is unusual in PEI, but if your result is above 200 Bq/m³ it's a solvable problem (here's what to do if your radon is above 200 Bq/m³). Health Canada recommends hiring a C-NRPP-certified radon mitigation professional.
How it works. The standard, most effective method is active soil depressurization (ASD), also called sub-slab depressurization: a pipe through the foundation slab and a continuously running fan draw radon from beneath the home and vent it outside before it can enter your living space. In most homes this reduces radon by more than 80%, and a system often installs in about a day. A good contractor will run the fan continuously (never off), check that the system doesn't cause "back-drafting" of a furnace or water heater, and verify the work with a follow-up long-term test the next heating season.
What it costs. Health Canada estimates $2,000–$3,000 for a typical sub-slab system, and national data from Take Action on Radon averages about $2,700 (complex buildings cost more). Running the fan adds roughly $50–$75 a year in electricity. (See radon mitigation cost in Canada.)
Find a certified professional. The Canadian National Radon Proficiency Program (C-NRPP) — run by the Canadian Association of Radon Scientists and Technologists with Health Canada oversight — certifies radon measurement professionals, mitigation professionals, and labs. Search the directory at c-nrpp.ca/find-a-professional. RadonTest.ca does not perform mitigation or recommend specific companies. (See also how to choose a licensed radon mitigator.)
PEI's radon rules and protections
A model school-testing program
PEI stands out for testing radon in all of its public schools — a program the province has run (and funded itself) since 2008. The Public Schools Branch, with Health Canada, retested all Island schools in a recent three-year program, and 2023–24 results were all below the guideline. It's a useful example of proactive public-building testing in a low-prevalence province.
Building Code: a radon rough-in (in code-administering municipalities)
PEI adopted the National Building Code of Canada (in effect March 31, 2021), which requires new small homes to include a radon rough-in — a sealed soil-gas barrier and a capped pipe ready for a fan. An important nuance: PEI applies the National Building Code primarily through municipalities that administer building permits, so the requirement effectively bites in incorporated municipalities rather than uniformly across every rural property. It's a passive rough-in: a fan is added only if a later test shows elevated radon. (More detail: Canadian building codes and radon.)
Selling a home: disclosure
PEI follows "buyer beware" (caveat emptor) for visible defects, but sellers have a duty to disclose known material latent (hidden) defects — and a known, unmitigated high radon result would fall into that category. Unlike Nova Scotia, New Brunswick, and BC, PEI's standard property disclosure statement is not listed by Health Canada as including a specific radon line, and using a disclosure statement is customary rather than legally mandatory. Practical takeaway: if you've tested and know your level is high, disclose it; if you're buying, ask. (See radon when buying or selling a home in Canada.)
New-home warranty and workplaces
A new-home warranty is voluntary in PEI (through the Atlantic Home Warranty Program) and does not explicitly cover radon — unlike Ontario's Tarion warranty (which covers radon mitigation up to $50,000). PEI's workplace safety rules set no binding radon limit; separately, federally regulated workplaces in PEI fall under the new federal rule SOR/2026-10, which sets a binding limit of 200 Bq/m³ (replacing the old 800 Bq/m³), coming into force around February 2027. (For warranty details across Canada, see does your new home warranty cover radon?; for rentals, see landlords and renters.)
Financial help in PEI
- Free test kits to borrow from the PEI Provincial Library Service — the easiest way to find out where you stand.
- No dedicated PEI provincial radon grant exists; the province points residents to the national Canadian Lung Association and to PEI's general home-renovation assistance.
- Lungs Matter (Canadian Lung Association) — a national grant of up to $1,500 toward mitigation, prioritizing people diagnosed with lung cancer and lower-income households (a long-term C-NRPP test result at or above 200 Bq/m³ is required).
- There is currently no open federal radon-mitigation grant for the general public.
Frequently asked questions
What is a risk-free radon level in PEI? No level is completely risk-free. Health Canada's guideline is 200 Bq/m³, the level above which it recommends acting within a year. The risk below the guideline is small but not zero, and the WHO references a more protective 100 Bq/m³.
How common is high radon in PEI? It's the lowest in Canada — Health Canada's 2012 survey found about 3.5% of PEI homes above the guideline. But individual homes can still be high, so testing is still worthwhile.
Should I bother testing if PEI is low-radon? Yes. "Low average" doesn't mean your home is low — high-reading PEI homes exist. A long-term test is inexpensive (and kits can be borrowed free from the library).
Does PEI's new-home warranty cover radon? No. PEI's new-home warranty is voluntary and does not cover radon — unlike Ontario's Tarion warranty.
Do I have to disclose radon when selling a home in PEI? A known, unmitigated high radon result is a latent defect a seller is generally expected to disclose. There's no obligation to test before selling, and PEI's disclosure statement isn't listed as having a dedicated radon line.
How long does a radon test take? At least 91 days (about three months) for a valid long-term result. Short-term tests aren't suitable for deciding whether to act.
Test your PEI home
Prince Edward Island has the lowest radon prevalence in Canada — but "lowest" still isn't "none," and the only way to know your home's level is a long-term test.
Order your RadonTest.ca kit → — lab analysis by a C-NRPP-certified laboratory (with an all-in-Canada analysis option), tracked shipping both ways, and your result delivered with clear Health Canada context.
Sources
- Health Canada — Radon: What you need to know ("1 in 5 homes," 16% of lung cancers, >3,000 deaths, >80% reduction), 2025. https://radontest.ca/links/hc-what-you-need-to-know
- Health Canada — About radon / Radon guideline (200 Bq/m³; corrective action within 1 year), modified 2025-09-24. https://www.canada.ca/en/health-canada/services/health-risks-safety/radiation/radon/about.html
- Health Canada — Cross-Canada Survey of Radon Concentrations in Homes, Final Report (PEI 3.5%, lowest province), 2012. https://www.canada.ca/en/health-canada/services/environmental-workplace-health/reports-publications/radiation/cross-canada-survey-radon-concentrations-homes-final-report-health-canada-2012.html
- Health Canada — Reduction Guide for Canadians ($2,000–$3,000; fan operating cost; 1-in-20 / 1-in-3 risk; mechanism), modified 2025-09-24. https://www.canada.ca/en/health-canada/services/environmental-workplace-health/reports-publications/radiation/radon-reduction-guide-canadians-health-canada.html
- Health Canada — Guide for radon measurements in homes (91-day test, season guidance, retest triggers), modified 2025-12-22. https://radontest.ca/links/hc-measurements-guide
- Government of PEI — Radon (mechanism; NBC adoption 2020; funding pointers), modified 2025-09-08. https://www.princeedwardisland.ca/en/information/health-and-wellness/radon
- Government of PEI — National Building Code standards in effect March 31, 2021. https://www.princeedwardisland.ca/en/news/national-building-code-standards-in-effect-march-31-2021
- PEI Public Schools Branch — Radon testing (all public schools tested; 2023–24 results below guideline). https://psb.edu.pe.ca/schools/school-health-and-safety/radon-testing
- 2024 Cross-Canada Radon Survey (Evict Radon / University of Calgary) — Atlantic region figure (not PEI-specific). https://crosscanadaradon.ca/survey/
- Take Action on Radon — Atlantic (HC 2012 PEI 3.5%; Queens County PEI 100-Kit Challenge). https://takeactiononradon.ca/provinces/atlantic/
- Canada Gazette Part II — SOR/2026-10 (federal workplaces: 200 Bq/m³, in force ~Feb 2027). https://gazette.gc.ca/rp-pr/p2/2026/2026-02-11/html/sor-dors10-eng.html
- Canadian Lung Association — Lungs Matter radon mitigation grant (up to $1,500). https://www.lung.ca/air-quality/radon/lungs-matter-radon-mitigation-support
Lab analysis is performed independently by a C-NRPP-certified laboratory. Results are reported against the Health Canada guideline of 200 Bq/m³. RadonTest.ca coordinates kit logistics and sample submission only — it does not interpret or modify lab results and does not provide medical, legal, or warranty advice. Information attributed to Health Canada, the Government of PEI, and others is summarized from the public sources listed above; confirm time-sensitive details (building-code administration, disclosure obligations, program availability) with the responsible body.