Photo: Matdumsa · CC BY-SA 4.0Flood mapping exists for Bois-des-Filion: 1 on record, latest by Gouvernement du Québec
Burn scars are few around Bois-des-Filion, with 0% of the land within 25 km touched by fire since 1986 (0.000% a year). Earthquakes add more: NRCan’s model puts building losses at $0.13 a year per $1,000 of value, against $0.030 for the typical town. In Health Canada’s survey, 10% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Hazard risk gives Bois-des-Filion a grade of C−, from earthquakes and radon alone.
What stands out about Bois-des-Filion’s hazards
For Bois-des-Filion, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Bois-des-Filion faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Bois-des-Filion: C−
For Bois-des-Filion, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #411 of 507 in Quebec and #2,395 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. 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 Bois-des-Filion has burned: 0.1% within 5 km, 0% within 25 km since 1986
Past fire around Bois-des-Filion’s homes, from the national burned-area record, with the fuel within 5 km.
At 0.000% of the land a year, Bois-des-Filion’s burn rate is in the low band; the typical Canadian town sees 0.000%.
5.3% of the land within 25 km of Bois-des-Filion is forest fuel, yet only 2.5% within 5 km of its homes.
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
Of the 513 towns in Quebec, 144 have a burn rate that rounds to zero, Bois-des-Filion among them; Mistissini leads at 0.31% a year.
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.
Bois-des-Filion shares the low band with 92% of Canada’s 2,610 towns, its burn rate rounding to nothing; 7.5% burn faster.
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.
Bois-des-Filion is on the flood map inventory: 1 study, by Gouvernement du Québec
What Canada’s Flood Map Inventory lists for Bois-des-Filion: who studied flooding and where to see their maps.
The flood study touching Bois-des-Filion is Gouvernement du Québec’s, dated 2006; its own map shows the zones street by street.
| Study | By | Year | Status |
|---|---|---|---|
| Moulins-Thérèse-De-Blainville-Deux-Montagnes-Laval | Gouvernement du Québec | 2006 | final |
Towns with a flood study on file
Bois-des-Filion is one of the 45% of towns in Quebec with a flood study on file, fewer than Canada’s 58%.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Nothing here counts toward Risk; the studies are pointers to the maps their owners keep for Bois-des-Filion.
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 Bois-des-Filion’s costliest hazard: $0.13 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Roughly 4.5 times the typical $0.030: Bois-des-Filion’s $0.13 marks real seismic exposure.
Shaking damage a year per $1,000 of building value
The median in Quebec is $0.14; Bois-des-Filion, at $0.13, is right beside it, and La Pocatière tops the list 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.
In the upper part of Canada’s range: 22% of its 2,611 towns expect more damage than Bois-des-Filion.
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 Bois-des-Filion 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).
Test for radon in Bois-des-Filion: 10% of area homes were over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
the typical Canadian town has 6.6% over the guideline; Bois-des-Filion’s area has 10%. Figures for radon tests are published for the Laurentides health region as a whole, not for Bois-des-Filion alone.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs higher around Bois-des-Filion than in most towns in Quebec: 10% over the guideline (8.2% is typical), 1.3% over 600.
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 Bois-des-Filion, 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 Bois-des-Filion’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 Bois-des-Filion
Environment and Climate Change Canada issues the weather alerts for Bois-des-Filion; 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. |
Smoke and fire warnings for Bois-des-Filion come through Environment Canada and Alert Ready; the fire map is CWFIS’s.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Bois-des-Filion
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Bois-des-Filion | Low | $0.13 | 10% | Yes |
| Lorraine 9,721 · 1.7 km | Low | $0.18 | 10% | Yes |
| Auteuil 27,843 · 4.2 km | Low | $0.21 | 12% | Yes |
| Rosemère 14,198 · 4.3 km | Low | $0.16 | 10% | Yes |
| Sainte-Thérèse 27,253 · 6.9 km | Low | $0.20 | 10% | None listed |
| Vimont 31,166 · 7.5 km | Low | $0.21 | 12% | None listed |
| Sainte-Rose 37,408 · 7.6 km | Low | $0.21 | 12% | Yes |
The fire record around Sainte-Thérèse is a touch heavier than Bois-des-Filion’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 Bois-des-Filion faces
Practical steps for Bois-des-Filion’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.
- 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
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Bois-des-Filion’s census subdivision (a neighbourhood shows its city’s).
- Wildfire counts one way. For Bois-des-Filion, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
- 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 Bois-des-Filion sits in.
- 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 Bois-des-Filion floods.
Questions about flooding and hazards in Bois-des-Filion
Does Bois-des-Filion flood?
Bois-des-Filion’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
How big is the earthquake risk in Bois-des-Filion?
NRCan’s model expects shaking to cost buildings in Bois-des-Filion $0.13 a year for every $1,000 of their value, on average over many years.
Is Bois-des-Filion at risk of wildfire?
Some, but Bois-des-Filion’s low band (0% of nearby land burned since 1986, latest 2025) is short of the level that counts.
Is radon a problem in Bois-des-Filion?
The area’s survey found 10% of 78 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Bois-des-Filion.
How is Bois-des-Filion’s Hazard risk Grade worked out?
Bois-des-Filion’s Hazard risk grade is C−, built on earthquakes and radon with a one-sided wildfire input.
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).