Photo: Bull-Doser at English Wikipedia · Public domainHazard risk in Rosemère is higher than in 86% of Canadian towns
Burn scars are few around Rosemère, with 0% of the land within 25 km touched by fire since 1986 (0.000% a year). Shaking is a bigger worry than in most places, at $0.16 a year per $1,000 of building value ($0.030 typical). In Health Canada’s survey, 10% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Rosemère grades D for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Rosemère’s hazards
For Rosemère, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Rosemère faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Rosemère: D
Risk averages earthquakes and radon; wildfire joins only where it pulls the average down, so a town like Rosemère with little fire nearby would get no credit for it.
Its place: #430 of 507 in Quebec and #2,422 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Only 78 homes were tested in the survey area, so the radon share is rough. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Rosemère has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Rosemère’s residents live, and the fuel next to their homes.
Fire claims 0.000% of the land around Rosemère each year, a low band, with the typical Canadian town at 0.000%.
Only 4.6% of the land within 25 km of Rosemère is forest fuel, and 0.1% close in.
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 Quebec · highest of 513
To three decimals the burn rate around Rosemère is zero, as for 144 of the 513 towns in Quebec, while Mistissini reaches 0.31%.
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 holds 92% of Canada’s 2,610 towns, and Rosemère sits at its very bottom; only 7.5% are above it.
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.
A flood study covers Rosemère, from Gouvernement du Québec: 1 on the inventory
Flood studies whose area touches Rosemère, from NRCan’s inventory, each linked to its owner.
For Rosemère the inventory points to Gouvernement du Québec’s 2006 study, whose map is the one to check.
| Study | By | Year | Status |
|---|---|---|---|
| Moulins-Thérèse-De-Blainville-Deux-Montagnes-Laval | Gouvernement du Québec | 2006 | final |
Towns with a flood study on file
Only 45% of towns in Quebec have a flood study, short of Canada’s 58%; Rosemère is one of them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood studies don’t enter the grade; they are listed so you can open the official map for Rosemère.
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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
Shaking is Rosemère’s costliest hazard: $0.16 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.
The typical town loses $0.030 a year to shaking; Rosemère loses $0.16, 5.3 times as much.
Shaking damage a year per $1,000 of building value
Rosemère’s $0.16 is close to the median in Quebec, $0.14; La Pocatière is highest at $0.48.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
More earthquake risk than most: only 15% of Canada’s 2,611 towns are above Rosemère.
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).
What a quake does after the shaking, fire, landslides, tsunami, falls outside NRCan’s figure for Rosemère.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Radon runs high around Rosemère: 10% of tested homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
the typical Canadian town has 6.6% over the guideline; Rosemère’s area has 10%. Nobody publishes radon tests for Rosemère alone, so this card uses the figure for the Laurentides health region.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Rosemère, 10% of tests were over 200 Bq/m³ and 1.3% over 600, against a median of 8.2% in Quebec.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
4.6% of Canada’s 2,611 towns have a higher share of homes over 200 Bq/m³ than Rosemère, in the 10–20% band with 22%.
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.
Whatever Rosemère’s area share, the reading that matters is your own home’s, over a winter.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Rosemère
Alerts for Rosemère come from Environment and Climate Change Canada and, for emergencies, Alert Ready.
| 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. |
Fire danger and active fires near Rosemère are mapped daily by the Canadian Wildland Fire Information System; evacuation orders come from the municipality or province.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Rosemère
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Rosemère | Low | $0.16 | 10% | Yes |
| Lorraine 9,721 · 3.4 km | Low | $0.18 | 10% | Yes |
| Auteuil 27,843 · 3.6 km | Low | $0.21 | 12% | Yes |
| Sainte-Thérèse 27,253 · 3.6 km | Low | $0.20 | 10% | None listed |
| Sainte-Rose 37,408 · 4.2 km | Low | $0.21 | 12% | Yes |
| Bois-des-Filion 10,666 · 4.3 km | Low | $0.13 | 10% | Yes |
| Boisbriand 29,830 · 4.9 km | Low | $0.20 | 10% | Yes |
The fire record around Sainte-Thérèse is a touch heavier than Rosemère’s, but the band is the same: low (here low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Rosemère faces
What to do about the hazards Rosemère faces, and what to ask before you buy.
- 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.
- Drop, cover and hold on.
- Strap the water heater down.
- Keep 72 hours of supplies.
- Has it had a radon test?
- Check the address on the flood map.
- Are flood and wildfire insured?
- Is earthquake cover included?
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 Rosemère.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Rosemère takes its 2007 health region’s share.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Rosemère’s included.
- Flood studies aren’t flood zones. The flood inventory points to maps; it is incomplete and not the official source, so ask the municipality about any street in Rosemère.
Questions about flooding and hazards in Rosemère
How big is the earthquake risk in Rosemère?
Expected earthquake damage in Rosemère comes to $0.16 a year for each $1,000 that buildings are worth.
Does Rosemère flood?
The inventory lists a study touching Rosemère; whether a given street floods is on that map, not in the grade.
Is radon a problem in Rosemère?
Around Rosemère, 78 survey homes were tested and 10% came in over 200 Bq/m³, a guide to the area, not to any one home.
How is Rosemère’s Hazard risk Grade worked out?
Rosemère grades D for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
Is Rosemère at risk of wildfire?
Fire has reached 0% of the land around Rosemère since 1986 (last in 2025); at low, it neither helps nor hurts the grade.
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).