Photo: Abebenjoe · CC BY-SA 3.0Cape Breton’s hazards at a glance: a low wildfire record and 14% of area homes over the radon guideline
Fire seldom reaches Cape Breton: since 1986, 0.3% of the land within 25 km has burned (0.008% a year). Shaking is about as much of a worry in Cape Breton as in most places, at $0.020 a year per $1,000 of building value ($0.030 typical). Cape Breton grades C+ for hazard risk, with wildfire counted against it.
What stands out about Cape Breton’s hazards
For Cape Breton, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Cape Breton faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Cape Breton grades C+ for hazard risk
Earthquake risk and radon make Cape Breton’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
Its place: #2,034 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Wildfire is rare near Cape Breton: 0.3% of the land within 25 km burned since 1986, 0.7% within 5 km
Fires mapped since 1986 around where Cape Breton’s residents live, and the fuel next to their homes.
At 0.008% of the land a year, Cape Breton’s burn rate is in the low band; the typical Canadian town sees 0.000%.
Forest fuel is spread evenly around Cape Breton: 74% within 5 km, 78% within 25 km.
Shares of land within 5 and 25 km of populated blocks: burned at least once in 1986–2025 (CWFIS burned-area composite), forest fuel and grass (fire behaviour fuel types, 2026, 250 m grid).
Burn rate a year, towns in Nova Scotia · highest of 90
Cape Breton burns at 0.008% a year, 45th of 90 towns in Nova Scotia; the leader, Barrington, reaches 0.46%.
Each bar: the yearly average share of land within 25 km of a town’s homes that burned, 1986–2025 (CWFIS); the seven highest towns of 2,500 people or more.
The low band takes in 92% of Canada’s 2,610 towns, Cape Breton among them, though its rate is above zero; 7.5% rank higher.
Bands of the yearly burn rate: low under 0.05%, moderate under 0.25%, high under 1%, very high 1% or more; towns of 2,500 people or more.
Fire danger and active fires (CWFIS)
Canadian Wildland Fire Information System: National Burned Area Composite 1986–2025 and fire behaviour fuel types (2026), Natural Resources Canada. Measured within 25 km and 5 km of each populated dissemination area; past fire, not a forecast.
The flood map inventory lists nothing for Cape Breton
Flood studies whose area touches Cape Breton, from NRCan’s inventory, each linked to its owner.
Nationally, Cape Breton has no listed flood study; the municipality is the place to ask.
Towns with a flood study on file
Mapping in Nova Scotia reaches 88% of towns, beside 58% across Canada, but not Cape Breton.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood is shown here, never graded: a study says where a map exists, not how many of Cape Breton’s homes stand in a flood zone.
The inventory’s own caution (NRCan): “The Canada Flood Map (CFM) does not include every flood hazard map in Canada and may be incomplete or contain inaccuracies. It should not be relied upon as the official source of flood mapping information. Furthermore, if a map appears to be missing, this does not necessarily mean that the area has never been mapped. For the official version of a map, updated information, or confirmation of applicable regulations, please contact the local authority responsible for flood mapping.”
Expected shaking damage in Cape Breton: $0.020 a year per $1,000
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
0.7 times the typical $0.030: Cape Breton’s $0.020 is ordinary.
Shaking damage a year per $1,000 of building value
Earthquake risk around Cape Breton ($0.020) matches the middle in Nova Scotia ($0.018), far from Clare’s $0.034.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Around half of Canada’s 2,611 towns expect more shaking damage than Cape Breton (64%).
Each column: the share of Canada’s towns of 2,500 people or more in that range of yearly loss per $1,000 (NRCan, 2022).
For Cape Breton the model prices shaking damage to buildings, nothing more.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
14% of homes tested around Cape Breton are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Radon tests for the Zone 5 health region
A higher share than most: 14% of tested homes around Cape Breton, the typical Canadian town 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Cape Breton’s area, at 14%, is close to the median in Nova Scotia (13%); 6.5% of its tests passed 600 Bq/m³.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
The 10–20% band holds 22% of Canada’s 2,611 towns, Cape Breton among them; 4.6% rank above.
Each bar: the share of Canada’s towns of 2,500 people or more whose survey area had that share of tests over 200 Bq/m³.
Radon varies from house to house in Cape Breton, so the survey is a reason to test, not a result for yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Cape Breton
Environment and Climate Change Canada issues the weather alerts for Cape Breton; Alert Ready carries the urgent ones to phones, radio and TV.
| Alert | What it means |
|---|---|
| Warning | Severe weather is happening or about to: act now. |
| Watch | Conditions favour severe weather: be ready. |
| Advisory | Weather that is less severe but could disrupt the day. |
| Special weather statement | Unusual weather worth knowing about. |
| Special air quality statement | Poor air, often wildfire smoke. |
For fires near Cape Breton, the national fire information system maps danger and active fires daily; local authorities give any evacuation order.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Cape Breton
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Cape Breton | Low | $0.020 | 14% | None listed |
| Membertou 28B 1,266 · 6.0 km | Low | $0.018 | 14% | None listed |
Membertou 28B burns a little more than Cape Breton, in the same low band (low here).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Cape Breton faces
Practical steps for Cape Breton’s hazards, most pressing first.
- Test for three months in winter.
- Over 200 Bq/m³: fix it.
- Kits are cheap; pros test too.
- Never drive through floodwater.
- Move papers and medicines upstairs.
- Ask whether your street is mapped.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- Has it had a radon test?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
What this data can and can’t tell you
- Wildfire counts one way. Burned land within 25 km of where people live, averaged over 1986–2025 and checked for fuel near homes, is the measure; it looks back, not ahead, and only ever counts against Cape Breton.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Cape Breton’s included.
- Flood studies aren’t flood zones. A study’s area can be a whole watershed or province, so being on the inventory says a map exists, not that a home in Cape Breton floods.
- Radon is a survey. The radon share comes from about 14,000 long-term home tests in 2009–2011, pooled for now by the 2007 health region Cape Breton sits in.
Questions about flooding and hazards in Cape Breton
Is Cape Breton at risk of wildfire?
Some, but Cape Breton’s low band (0.3% of nearby land burned since 1986, latest 2025) is short of the level that counts.
How is Cape Breton’s Hazard risk Grade worked out?
Hazard risk gives Cape Breton C+, weighing earthquakes and radon and counting wildfire only against it.
Does Cape Breton flood?
The inventory has 0 studies for Cape Breton, and an empty list isn’t a clean bill: the municipality holds any flood maps.
Is radon a problem in Cape Breton?
The area’s survey found 14% of 92 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Cape Breton.
How big is the earthquake risk in Cape Breton?
Expected earthquake damage in Cape Breton comes to $0.020 a year for each $1,000 that buildings are worth.
Seismic risk: Natural Resources Canada. Radon: Health Canada. Wildfire: Canadian Wildland Fire Information System. Flood studies: Natural Resources Canada, Canada Flood Map Inventory. Contains information licensed under the Open Government Licence – Canada.
Sources: NRCan, Canada’s Seismic Risk Model 2022 · Health Canada, Cross-Canada Survey of Radon Concentrations in Homes · CWFIS, National Burned Area Composite and FBP fuel types · NRCan, Canada Flood Map Inventory. Under the Statistics Canada Open Licence.
Adapted from Statistics Canada (Census of Population 2021, population estimates 2025, 2021 census boundaries) under the Statistics Canada Open Licence; this does not constitute an endorsement by Statistics Canada. Neighbourhood names in some cities © OpenStreetMap contributors (ODbL).