Photo: Jeangagnon · CC BY-SA 3.0Hazards in Saint-Jude: wildfire low, radon over the guideline in 8.2% of tested homes
Fire seldom reaches Saint-Jude: since 1986, 0.1% of the land within 25 km has burned (0.002% a year). Seismic risk runs high: $0.23 of expected damage per $1,000 of buildings a year, the typical town $0.030. Saint-Jude grades C− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Saint-Jude’s hazards
For Saint-Jude, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Jude faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Saint-Jude grades C− for hazard risk
Two inputs always count for Saint-Jude, earthquakes and radon; the third, wildfire, counts only against a town.
Its place: #383 of 507 in Quebec and #2,362 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.
Wildfire is rare near Saint-Jude: 0.1% of the land within 25 km burned since 1986, 0% within 5 km
Past fire around Saint-Jude’s homes, from the national burned-area record, with the fuel within 5 km.
Fire claims 0.002% of the land around Saint-Jude each year, a low band, with the typical Canadian town at 0.000%.
Fire has stayed at least 12 km from Saint-Jude’s homes since 1986.
Land that isn’t forest covers nearly all the ground around Saint-Jude: forest fuel is 0% within 5 km and 0.8% 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
Saint-Jude ranks 35th of the 513 towns in Quebec for burn rate, at 0.002% a year; Mistissini leads with 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 takes in 92% of Canada’s 2,610 towns, Saint-Jude among them, though its rate is above zero; 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-Jude
What Canada’s Flood Map Inventory lists for Saint-Jude: who studied flooding and where to see their maps.
The inventory has nothing for Saint-Jude, but a local or conservation-authority map may still exist.
Towns with a flood study on file
Flood maps are thinner in Quebec, 45% of towns against 58% nationally, and Saint-Jude has none.
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-Jude.
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-Jude $0.23 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
At $0.23 per $1,000, Saint-Jude carries roughly 7.6 times the typical Canadian town’s earthquake risk ($0.030).
Shaking damage a year per $1,000 of building value
At $0.23, Saint-Jude is above the typical town in Quebec ($0.14); La Pocatière has the most 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.
Only 6.4% of Canada’s 2,611 towns expect more shaking damage than Saint-Jude.
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 Saint-Jude 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). · Earthquake risk: one figure for all of the city of Longueuil
Radon about average around Saint-Jude: 8.2% over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Measured across the Monteregie health region: radon tests
The survey area of Saint-Jude reads 8.2%, a shade from the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Saint-Jude’s area, at 8.2%, is close to 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.
26% of Canada’s 2,611 towns have more homes over 200 Bq/m³ than Saint-Jude’s 5–10% band, which holds 37%.
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-Jude’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-Jude
Environment and Climate Change Canada issues the weather alerts for Saint-Jude; 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-Jude 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 Saint-Jude
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Jude | Low | $0.23 | 8.2% | None listed |
| Vieux-Longueuil 15,414 · 1.6 km | Low | $0.23 | 8.2% | None listed |
| Notre-Dame-de-la-Garde 6,671 · 1.9 km | Low | $0.23 | 8.2% | None listed |
| Notre-Dame-de-Grâces 10,204 · 2.1 km | Low | $0.23 | 8.2% | None listed |
| Hochelaga 11,355 · 2.4 km | Low | $0.20 | 6.8% | None listed |
| Sainte-Marie 33,699 · 2.6 km | Low | $0.20 | 6.8% | None listed |
| Carillon / Saint-Pie-X 5,457 · 2.9 km | Low | $0.23 | 8.2% | None listed |
Vieux-Longueuil (low) has the heaviest fire record of Saint-Jude’s neighbours, and Saint-Jude (low) matches or beats it.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Jude faces
What to do about the hazards Saint-Jude 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
- Wildfire counts one way. For Saint-Jude, 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. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Saint-Jude takes its 2007 health region’s share.
- 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 Saint-Jude.
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Saint-Jude’s census subdivision (a neighbourhood shows its city’s).
Questions about flooding and hazards in Saint-Jude
Does Saint-Jude flood?
Nothing is listed for Saint-Jude on the national inventory (0); local maps may still exist with the municipality.
Is radon a problem in Saint-Jude?
In Health Canada’s survey, 8.2% of 110 homes tested in Saint-Jude’s area were above 200 Bq/m³, though only a test tells you about one house.
Is Saint-Jude at risk of wildfire?
Less than most of Canada: 0.1% of the land within 25 km of Saint-Jude has burned since 1986, the last in 2024, a low band that leaves Risk alone.
How big is the earthquake risk in Saint-Jude?
In NRCan’s seismic model, Saint-Jude’s buildings lose $0.23 per $1,000 of value in an average year.
How is Saint-Jude’s Hazard risk Grade worked out?
Saint-Jude grades C− for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers 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).