Photo: Quintin Soloviev · CC BY 4.0A flood study covers Saint-Léonard-d'Aston: 1 on the national inventory, the newest from Gouvernement du Québec
The national fire record shows next to nothing around Saint-Léonard-d'Aston, 0% of the land within 25 km since 1986 (0.001% a year). Shaking is a bigger worry than in most places, at $0.13 a year per $1,000 of building value ($0.030 typical). Fewer homes than usual carry radon here, 0% over the guideline where the typical town has 6.6%. Hazard risk gives Saint-Léonard-d'Aston a grade of B+; its wildfire band pulls it down.
What stands out about Saint-Léonard-d'Aston’s hazards
For Saint-Léonard-d'Aston, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Léonard-d'Aston 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-Léonard-d'Aston: B+
The grade weighs Saint-Léonard-d'Aston’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
Its place: #35 of 507 in Quebec and #1,075 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. The radon share rests on 58 home tests in the survey area, so a few homes move it. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Wildfire is rare near Saint-Léonard-d'Aston: 0% of the land within 25 km burned since 1986, 0% within 5 km
Past fire around Saint-Léonard-d'Aston’s homes, from the national burned-area record, with the fuel within 5 km.
The yearly burn rate around Saint-Léonard-d'Aston is 0.001%, low beside 0.000% for the typical Canadian town.
Fire has stayed at least 15 km from Saint-Léonard-d'Aston’s homes since 1986.
Forest fuel is spread evenly around Saint-Léonard-d'Aston: 8.3% within 5 km, 12% 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
At 0.001% a year, Saint-Léonard-d'Aston ranks 136th of the 513 towns in Quebec; Mistissini leads at 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.
7.5% of Canada’s 2,610 towns burn fast enough to rank moderate or above; Saint-Léonard-d'Aston stays low, with 92%.
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 Saint-Léonard-d'Aston, from Gouvernement du Québec: 1 on the inventory
What Canada’s Flood Map Inventory lists for Saint-Léonard-d'Aston: who studied flooding and where to see their maps.
One study on the inventory touches Saint-Léonard-d'Aston, Gouvernement du Québec’s from 2009, and its area can be large, so it says a map exists, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| St-Léonard-d'Aston | Gouvernement du Québec | 2009 | final |
Towns with a flood study on file
Its flood study sets Saint-Léonard-d'Aston apart in Quebec, where 45% of towns have one (Canada: 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 Saint-Léonard-d'Aston.
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 Saint-Léonard-d'Aston’s costliest hazard: $0.13 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
The typical town loses $0.030 a year to shaking; Saint-Léonard-d'Aston loses $0.13, 4.2 times as much.
Shaking damage a year per $1,000 of building value
Neither high nor low in Quebec: Saint-Léonard-d'Aston’s $0.13 sits by the median of $0.14, while 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.
Saint-Léonard-d'Aston sits above most of Canada’s 2,611 towns on earthquake risk; 22% are higher.
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).
Only shaking damage to buildings in Saint-Léonard-d'Aston is counted; landslides, liquefaction, tsunami and fire after a quake aren’t.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
0% of homes tested around Saint-Léonard-d'Aston are over the radon guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Where the typical Canadian town has 6.6% of homes over the guideline, Saint-Léonard-d'Aston’s area has fewer, 0%. Figures for radon tests are published for the Mauricie et Centre-du-Quebec health region as a whole, not for Saint-Léonard-d'Aston alone.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs lower around Saint-Léonard-d'Aston than in most towns in Quebec: 0% against 8.2%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Radon rarely tops the guideline around Saint-Léonard-d'Aston, as for 37% of Canada’s 2,611 towns; 63% see 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.
Health Canada advises testing every home, Saint-Léonard-d'Aston’s included, whatever the area’s figure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Saint-Léonard-d'Aston
Environment and Climate Change Canada issues the weather alerts for Saint-Léonard-d'Aston; 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 Saint-Léonard-d'Aston, 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 Saint-Léonard-d'Aston
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Léonard-d'Aston | Low | $0.13 | 0% | Yes |
| Saint-Wenceslas 1,202 · 7.9 km | Low | $0.12 | 0% | None listed |
| Sainte-Eulalie 1,056 · 9.9 km | Low | $0.12 | 0% | None listed |
| Notre-Dame-du-Bon-Conseil 1,950 · 13 km | Low | $0.13 | 0% | None listed |
| Sainte-Clotilde-de-Horton 1,647 · 18 km | Low | $0.11 | 0% | Yes |
Among its neighbours Saint-Léonard-d'Aston has the most fire on record (low); Saint-Wenceslas follows (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Léonard-d'Aston faces
What to do about the hazards Saint-Léonard-d'Aston 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
- 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-Léonard-d'Aston.
- 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 Saint-Léonard-d'Aston.
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Saint-Léonard-d'Aston is its health region’s, the survey’s design unit.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Saint-Léonard-d'Aston’s included.
Questions about flooding and hazards in Saint-Léonard-d'Aston
Is radon a problem in Saint-Léonard-d'Aston?
Around Saint-Léonard-d'Aston, 58 survey homes were tested and 0% came in over 200 Bq/m³, a guide to the area, not to any one home.
How is Saint-Léonard-d'Aston’s Hazard risk Grade worked out?
Saint-Léonard-d'Aston’s Hazard risk grade is B+, built on earthquakes and radon with a one-sided wildfire input.
Is Saint-Léonard-d'Aston at risk of wildfire?
Fire has reached 0% of the land around Saint-Léonard-d'Aston since 1986 (last in 2020); at low, it neither helps nor hurts the grade.
How big is the earthquake risk in Saint-Léonard-d'Aston?
NRCan’s model expects shaking to cost buildings in Saint-Léonard-d'Aston $0.13 a year for every $1,000 of their value, on average over many years.
Does Saint-Léonard-d'Aston flood?
There is flood mapping for Saint-Léonard-d'Aston on the national inventory, each study linked to its owner’s map, none of them graded.
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).