A note before you read. This is general consumer information for Nova Scotia homeowners, buyers, sellers, landlords, and renters, drawn from publicly available Health Canada, Evict Radon / University of Calgary, the Government of Nova Scotia, 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 Nova Scotia at a glance
- Nova Scotia has among the highest residential radon in Canada. The 2024 Cross-Canada Radon Survey — cited by both the Government of Nova Scotia and the province's Geoscience and Mines Branch — puts about 36.8% of NS homes above the 200 Bq/m³ guideline (Health Canada's older 2012 survey found about 11%, so the measured share has risen sharply).
- Newer Halifax homes test worse, not better. A Health Canada survey found 67% of Halifax-area homes built 2012–2021 were above the guideline, versus 56% of homes built 2001–2010 — a striking, counterintuitive finding.
- Radon is the number one cause of lung cancer in non-smokers. Radon is estimated to cause more than 100 lung-cancer deaths a year in Nova Scotia (CAREX Canada).
- The Health Canada guideline is 200 Bq/m³ (annual average). Above it, Health Canada recommends acting within one year — sooner the higher the level.
- Nova Scotia is one of the few provinces with its own radon grant. LungNSPEI offers up to $2,500 toward mitigation for income-eligible households — on top of the national Lungs Matter grant.
- No warranty backstop: NS's new-home warranty is voluntary and doesn't cover radon. New homes must include a radon rough-in under the building code.
- A valid test takes at least 91 days (about three months). Fixing a home usually costs in the low thousands and installs in about a day.
How much radon is in Nova Scotia homes?
Radon is a naturally occurring radioactive gas — colourless, odourless, tasteless — produced as uranium in soil and rock breaks down, then seeping indoors. Nova Scotia's numbers are among the highest in the country.
- Health Canada's Cross-Canada Survey (2012) found about 11% of NS homes above the 200 Bq/m³ guideline (up to 14% in some regions).
- The 2024 Cross-Canada Radon Survey (Evict Radon / University of Calgary) put Nova Scotia much higher — about 36.8% of homes above the guideline, a figure cited by both the Government of Nova Scotia and the province's Department of Natural Resources. The province's own radon database (now nearly 3,800 NS homes) validates this, finding an overall ~33% chance of exceeding the guideline — and about 55% in mapped high-risk areas.
The jump from 11% (2012) to ~37% (2024) is real and mirrors the national rise; it reflects far larger, more representative sampling (and tighter modern homes), not a sudden change in the gas itself. Keep both figures in mind by date. Health Canada uses "1 in 5" as its national headline; Nova Scotia sits well above it. The province is clear that there are no radon-free areas in NS. (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.
The Halifax "newer homes" finding. A 2019 community testing project found 37% of Halifax homes above the guideline. More striking, a Health Canada survey of homes built after 2000 found 67% of Halifax-area homes built 2012–2021 above the guideline (versus 56% of those built 2001–2010), with newer homes nearly twice as likely to exceed 600 Bq/m³. The lesson: a newer Nova Scotia home is not a reason to skip testing — if anything, it's a reason to test.
Find your city: we maintain detailed local guides for Halifax and Sydney / Cape Breton, with more Nova Scotia communities on the way.
Why Nova Scotia has so much radon: the geology
Radon levels track the amount of uranium in the ground beneath a home, and Nova Scotia's bedrock is rich in it. The province's high readings are tied to uranium-bearing granites and fractured slates — most notably the South Mountain Batholith, the large granite body underlying much of central and southern Nova Scotia (including parts of the Halifax region). The Department of Natural Resources notes that high radon soil-gas values in the Halifax area are "typically associated with granites and slates, with granites being uraniferous and fractures in slate bedrock increasing the potential for radon escape." Nova Scotia's radon-risk map is built from bedrock geology, soil geology, and airborne uranium measurements — and, as the province stresses, no area is risk-free. As always, the picture varies house by house.
Is radon dangerous? The health risk in Nova Scotia
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.
For Nova Scotia specifically, CAREX Canada estimates radon causes more than 100 lung-cancer deaths in the province each year. With more than a third of homes potentially above the guideline, the risk is province-wide.
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. Radon acts over the long term, with no immediate symptoms. The point isn't alarm — radon is measurable and fixable, and testing is inexpensive (and, for some NS households, subsidized). (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 and what Health Canada recommends at each, 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 Nova Scotia
With a third or more of homes potentially above the guideline, testing is essential:
- 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. You can start any time of year — just plan to run it long enough.
- 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. (Nova Scotia public libraries also lend short-term screening detectors, which are useful for a quick look but don't replace a long-term test.) 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 (a finished basement, new furnace, added bathroom), 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. There's no blanket "every five years" rule for an unmitigated home — the trigger is change. (See when is radon testing season in Canada.)
If your radon is high: mitigation in Nova Scotia
A result above 200 Bq/m³ is 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 — and Nova Scotia, as one of Canada's highest-radon provinces, has an established mitigation industry.
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, water heater, or fireplace, and verify the work with a short-term test after activation plus a long-term test the following heating season — ideally not the company that installed it.
What it costs. There's no authoritative NS-only average, but 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 — and Nova Scotia has grants that can offset much of the cost (see below). (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.)
Nova Scotia's radon rules and protections
Nova Scotia pairs a strong building-code requirement and a disclosure duty with — unusually — its own mitigation grant.
Financial help: a Nova Scotia mitigation grant
Nova Scotia is one of the few provinces with its own radon mitigation grant. LungNSPEI's Radon Reduction Grant pays up to $2,500 directly to a homeowner's chosen C-NRPP-certified mitigator, for income-eligible NS households (typically a household income under $100,000, a long-term test result above 200 Bq/m³, and quotes from certified mitigators; check current terms with LungNSPEI). On top of that, the national Lungs Matter grant (Canadian Lung Association) offers up to $1,500, prioritizing people diagnosed with lung cancer and lower-income households. Stacked, these can cover much of a typical mitigation cost.
Building Code: a radon rough-in
New Nova Scotia homes are built with radon protection. NS adopted the National Building Code of Canada 2020 (in force April 1, 2025) province-wide, which requires new small (Part 9) homes to include a radon rough-in under the slab — a sealed soil-gas barrier and a capped pipe ready for a fan (the requirement traces back to the 2010 code NS adopted around 2011). It's a passive rough-in: if a later test shows elevated radon, a fan completes the system. The code governs new construction only and requires no testing — and, as the Halifax data shows, new homes still test high, so testing remains essential. (More detail: Canadian building codes and radon.)
Selling a home: a known high result must be disclosed
Nova Scotia follows "buyer beware" (caveat emptor) for visible defects, but a seller must disclose a known material latent (hidden) defect — and a known, unmitigated high radon result is exactly that. The property disclosure statement (administered by the Nova Scotia Real Estate Commission) is voluntary but addresses radon, and the regulator has published radon guidance for buyers, sellers, and agents. Practical takeaway: if you've tested and know your level is high, it should be disclosed; if you're buying, make radon part of your due diligence. (See radon when buying or selling a home in Canada.)
New-home warranty: voluntary, and no radon coverage
Unlike Ontario, a new-home warranty is not mandatory in Nova Scotia — coverage is voluntary, offered through the Atlantic Home Warranty Program by member builders, and does not explicitly cover radon. This contrasts with Ontario, where the Tarion warranty covers radon mitigation up to $50,000 — so in NS, fixing radon in a new home generally falls to the owner (helped by the grants above). (For the cross-country picture, see does your new home warranty cover radon?)
Workplaces and rentals
Nova Scotia's workplace safety rules set no binding radon limit for general workplaces; provincial guidance points employers to Health Canada's 200 Bq/m³ guideline. Separately, federally regulated workplaces in NS (banks, telecom, interprovincial transport, federal operations) 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 rental housing, see our guides for landlords and renters.
Financial help in Nova Scotia
- LungNSPEI Radon Reduction Grant — up to $2,500 toward mitigation by a C-NRPP-certified professional for income-eligible NS homeowners (a long-term test above 200 Bq/m³ is required). The standout Nova Scotia option.
- 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.
- There is no Nova Scotia provincial radon tax credit, and currently no open federal radon-mitigation grant for the general public.
Frequently asked questions
What is a risk-free radon level in Nova Scotia? 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 Nova Scotia? Among the highest in Canada. Health Canada's 2012 survey found about 11% of NS homes above the guideline; the 2024 Cross-Canada Radon Survey — cited by the Nova Scotia government — put it at about 36.8%, with high-risk areas around 55%.
Are newer homes lower-risk in Nova Scotia? No — the opposite in Halifax. A Health Canada survey found 67% of Halifax-area homes built 2012–2021 were above the guideline. A new home is a reason to test, not to skip it.
Is there help paying for radon mitigation in Nova Scotia? Yes. LungNSPEI offers a grant of up to $2,500 for income-eligible households, and the national Lungs Matter grant offers up to $1,500. Confirm current terms with each program.
Do I have to disclose radon when selling a home in Nova Scotia? A known, unmitigated high radon result is a material latent defect a seller is expected to disclose, and the disclosure statement addresses radon. There's no obligation to test before selling.
Does Nova Scotia's new-home warranty cover radon? No. NS's new-home warranty is voluntary and does not cover radon — unlike Ontario's Tarion warranty.
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 Nova Scotia home
Nova Scotia has among the highest radon in Canada — and grants to help fix it. But however you test, only a long-term measurement reveals your home's actual level.
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 — Reduction Guide for Canadians ($2,000–$3,000; fan operating cost; 1-in-20 / 1-in-3 risk; mechanism; verification), 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, 5-year retest for mitigated homes), modified 2025-12-22. https://radontest.ca/links/hc-measurements-guide
- Government of Nova Scotia — Make sense of radon (NS ~36.8% above guideline; ~100 deaths/yr; no radon-free areas), 2026. https://novascotia.ca/make-sense-of-radon/
- Nova Scotia Department of Natural Resources (MacRae) — Radon in Indoor Air in Nova Scotia, Report of Activities 2023–24 (3,776-home dataset; high-risk ~55%; geology). https://novascotia.ca/natr/meb/DATA/pubs/25re01/03ROA_2025_MacRae_Radon.pdf
- Health Canada — Radon gas survey in homes built after 2000: Halifax region (67% of 2012–2021 homes above guideline), 2022. https://www.canada.ca/en/health-canada/services/publications/health-risks-safety/radon-gas-survey-homes-built-after-2000-halifax-region.html
- 2024 Cross-Canada Radon Survey (Evict Radon / University of Calgary) — Atlantic region ~1 in 3; national ~18%. https://crosscanadaradon.ca/survey/
- Take Action on Radon — Atlantic (HC 2012 figures; Halifax 100-Kit Challenge). https://takeactiononradon.ca/provinces/atlantic/
- LungNSPEI — Radon mitigation assistance (NS Radon Reduction Grant up to $2,500) and Radon programs (library/MLA loans). https://www.lungnspei.ca/radonmitigationassistance
- Nova Scotia Real Estate Commission — Defects & disclosures (material latent defect duty; radon guidance). https://nsrec.ns.ca/consumers/your-transaction/defects-disclosures
- Nova Scotia Building Code Regulations (N.S. Reg. 198/2024, NBC 2020, in force April 1, 2025). https://novascotia.ca/just/regulations/regs/bcregs.htm
- 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 Nova Scotia, LungNSPEI, and others is summarized from the public sources listed above; confirm time-sensitive details (grant terms, building-code requirements, disclosure obligations, program availability) with the responsible body.