Photo: Dominic Paquin · Public domainFlood mapping exists for Mandeville: 1 on record, latest by Gouvernement du Québec
Fire seldom reaches Mandeville: since 1986, 0.1% of the land within 25 km has burned (0.001% a year). NRCan expects $0.056 of shaking damage a year per $1,000 of buildings in Mandeville, near the typical $0.030. Fewer homes than usual carry radon here, 3.9% over the guideline where the typical town has 6.6%. Hazard risk gives Mandeville a grade of B+; its wildfire band pulls it down.
What stands out about Mandeville’s hazards
Four national sources, each read for Mandeville: earthquakes, radon, past fires and flood studies.
What Mandeville faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Mandeville grades B+ for hazard risk
Two inputs always count for Mandeville, earthquakes and radon; the third, wildfire, counts only against a town.
Its place: #41 of 507 in Quebec and #1,102 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Only 77 homes were tested in the survey area, so the radon share is rough. Small fires and grass fires are largely missing from the national burned-area record.
Wildfire is rare near Mandeville: 0.1% of the land within 25 km burned since 1986, 0.3% within 5 km
Fires mapped since 1986 around where Mandeville’s residents live, and the fuel next to their homes.
Forty years of fire maps put Mandeville at 0.001% a year, low next to the typical Canadian town’s 0.000%.
The nearer ring around Mandeville is less wooded (30% forest fuel) than the land out to 25 km (45%).
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
Mandeville burns at 0.001% a year, 136th of 513 towns in Quebec; the leader, 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.
Some fire is mapped around Mandeville, but not enough to leave the low band, where 92% of Canada’s 2,610 towns are; 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.
Mandeville is on the flood map inventory: 1 study, by Gouvernement du Québec
Flood studies whose area touches Mandeville, from NRCan’s inventory, each linked to its owner.
For Mandeville the inventory points to Gouvernement du Québec’s 2005 study, whose map is the one to check.
| Study | By | Year | Status |
|---|---|---|---|
| Mandeville | Gouvernement du Québec | 2005 | final |
Towns with a flood study on file
Mandeville 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.
Flood studies don’t enter the grade; they are listed so you can open the official map for Mandeville.
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.
Expected shaking damage in Mandeville: $0.056 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.
1.9 times the typical $0.030: Mandeville’s $0.056 is ordinary.
Shaking damage a year per $1,000 of building value
At $0.056, Mandeville is below the typical town 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 30% of Canada’s 2,611 towns are above Mandeville.
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).
Roads, pipes and bridges aren’t in Mandeville’s figure, nor landslides or tsunami: it is buildings and shaking.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Radon runs low around Mandeville: 3.9% of tested homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Shared with the rest of the Lanaudiere health region: radon tests
Where the typical Canadian town has 6.6% of homes over the guideline, Mandeville’s area has fewer, 3.9%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Mandeville’s area, at 3.9%, is below the median in Quebec (8.2%).
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Mandeville is in the lowest band, with 37% of Canada’s 2,611 towns: under 5% of tests over the guideline, while 63% have more.
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.
Basements, soil and how a house is sealed decide its radon, so in Mandeville only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Mandeville
Alerts for Mandeville 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. |
Evacuation orders for Mandeville come from the municipality or the province, while CWFIS maps fire danger every day.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Mandeville
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Mandeville | Low | $0.056 | 3.9% | Yes |
| Saint-Gabriel 3,091 · 12 km | Low | $0.088 | 3.9% | Yes |
| Saint-Gabriel-de-Brandon 2,916 · 14 km | Low | $0.074 | 3.9% | None listed |
| Saint-Alexis-des-Monts 3,190 · 16 km | Low | $0.052 | 0% | Yes |
| Saint-Damien 2,569 · 18 km | Low | $0.051 | 3.9% | Yes |
Saint-Alexis-des-Monts burns a little more than Mandeville, 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 Mandeville faces
What to do about the hazards Mandeville 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.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- Has it had a radon test?
- Check the address on the flood map.
- Are flood and wildfire insured?
What this data can and can’t tell you
- 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 Mandeville sits in.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Mandeville’s figure is its subdivision’s.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Mandeville’s homes since 1986, a history of fire that may lower Risk but never raises it.
- 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 Mandeville floods.
Questions about flooding and hazards in Mandeville
How big is the earthquake risk in Mandeville?
Expected earthquake damage in Mandeville comes to $0.056 a year for each $1,000 that buildings are worth.
Is Mandeville at risk of wildfire?
Fire has reached 0.1% of the land around Mandeville since 1986 (last in 2025); at low, it neither helps nor hurts the grade.
Does Mandeville flood?
Mandeville’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 is Mandeville’s Hazard risk Grade worked out?
Mandeville grades B+ for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
Is radon a problem in Mandeville?
Around Mandeville, 77 survey homes were tested and 3.9% came in over 200 Bq/m³, a guide to the area, not to any one home.
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).