Photo: Judicieux · CC BY-SA 4.0Hazard risk in Saint-Isidore is higher than in 90% of Canadian towns
No wildfire is mapped within 25 km of Saint-Isidore’s homes since 1986 (0% of the land, 0.000% a year). Shaking is a bigger worry than in most places, at $0.12 a year per $1,000 of building value ($0.030 typical). More homes than usual carry radon here, 13% over the guideline where the typical town has 6.6%. Hazard risk gives Saint-Isidore a grade of D, from earthquakes and radon alone.
What stands out about Saint-Isidore’s hazards
For Saint-Isidore, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Isidore faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Saint-Isidore: D
Risk averages earthquakes and radon; wildfire joins only where it pulls the average down, so a town like Saint-Isidore with little fire nearby would get no credit for it.
Its place: #471 of 507 in Quebec and #2,474 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Saint-Isidore has burned: 0% within 5 km, 0% within 25 km since 1986
Past fire around Saint-Isidore’s homes, from the national burned-area record, with the fuel within 5 km.
Around Saint-Isidore fire takes 0.000% of the land in a typical year, the typical Canadian town 0.000%, which is low.
No fire has burned within 5 km of Saint-Isidore’s homes since 1986; the nearest burn is 15 km away.
Forest thickens with distance from Saint-Isidore: 6.8% of the land within 5 km, 25% 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 Quebec · highest of 513
Mistissini has the highest burn rate in Quebec, 0.31% a year; around Saint-Isidore, as around 144 of the 513 towns, it rounds to zero.
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.
Measured against 2,610 towns, Saint-Isidore is in the largest group, low (92%), and at its floor, while 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.
No flood study is listed for Saint-Isidore
What Canada’s Flood Map Inventory lists for Saint-Isidore: who studied flooding and where to see their maps.
Nationally, Saint-Isidore has no listed flood study; the municipality is the place to ask.
Towns with a flood study on file
Saint-Isidore has no flood study on file; only 45% of towns in Quebec do, against 58% across Canada.
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 Saint-Isidore.
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.”
Earthquakes cost buildings in Saint-Isidore $0.12 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
The typical town loses $0.030 a year to shaking; Saint-Isidore loses $0.12, 4 times as much.
Shaking damage a year per $1,000 of building value
About level with the typical town in Quebec: Saint-Isidore’s $0.12 against $0.14; La Pocatière reaches $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: 23% of its 2,611 towns expect more damage than Saint-Isidore.
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 Saint-Isidore.
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 Saint-Isidore: 13% 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; Saint-Isidore’s area has 13%. For radon tests, the only official count covers all of the Chaudiere-Appalaches health region, Saint-Isidore included.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs higher around Saint-Isidore than in most towns in Quebec: 13% over the guideline (8.2% is typical), 0.6% over 600.
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, Saint-Isidore 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.
Whatever Saint-Isidore’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 Saint-Isidore
Environment and Climate Change Canada issues the weather alerts for Saint-Isidore; 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 Saint-Isidore come through Environment Canada and Alert Ready; the fire map is CWFIS’s.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Saint-Isidore’s neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Isidore | Low | $0.12 | 13% | None listed |
| Scott 2,938 · 7.7 km | Low | $0.098 | 13% | None listed |
| Saint-Bernard 2,680 · 8.6 km | Low | $0.10 | 13% | None listed |
| Saint-Lambert-de-Lauzon 7,551 · 9.4 km | Low | $0.14 | 13% | None listed |
| Sainte-Hénédine 1,550 · 10 km | Low | $0.078 | 13% | None listed |
| Saint-Anselme 4,534 · 12 km | Low | $0.13 | 13% | Yes |
| Saint-Narcisse-de-Beaurivage 1,303 · 14 km | Low | $0.11 | 13% | None listed |
None of the places around has more fire nearby than Saint-Isidore (low); Scott comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Isidore faces
What to do about the hazards Saint-Isidore 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?
- Ask the municipality for flood maps.
- 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 Saint-Isidore’s census subdivision (a neighbourhood shows its city’s).
- Wildfire counts one way. For Saint-Isidore, 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. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Saint-Isidore is its health region’s, the survey’s design unit.
- Flood studies aren’t flood zones. NRCan’s inventory says where flood mapping exists, not where water goes; the map’s owner is the authority for Saint-Isidore.
Questions about flooding and hazards in Saint-Isidore
Is Saint-Isidore at risk of wildfire?
Fire has reached 0% of the land around Saint-Isidore since 1986 (last in 2018); at low, it neither helps nor hurts the grade.
Does Saint-Isidore flood?
With 0 studies on the inventory, Saint-Isidore’s flood risk is unmapped nationally; check with the municipality before buying.
How big is the earthquake risk in Saint-Isidore?
NRCan’s model expects shaking to cost buildings in Saint-Isidore $0.12 a year for every $1,000 of their value, on average over many years.
Is radon a problem in Saint-Isidore?
Around Saint-Isidore, 175 survey homes were tested and 13% came in over 200 Bq/m³, a guide to the area, not to any one home.
How is Saint-Isidore’s Hazard risk Grade worked out?
Saint-Isidore’s Hazard risk grade is D, 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).