Photo: Gabriel Picard · CC BY-SA 4.0Flood mapping exists for Repentigny: 2 on record, latest by Gouvernement du Québec
Wildfire barely registers for Repentigny, at 0% of the land within 25 km since 1986 (0.001% a year). Seismic risk runs high: $0.20 of expected damage per $1,000 of buildings a year, the typical town $0.030. Radon is lower than usual: 3.9% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Repentigny grades C+ for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Repentigny’s hazards
Four national sources, each read for Repentigny: earthquakes, radon, past fires and flood studies.
What Repentigny faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Repentigny grades C+ for hazard risk
Earthquake risk and radon make Repentigny’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
Its place: #115 of 507 in Quebec and #1,850 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 Repentigny: 0% of the land within 25 km burned since 1986, 0% within 5 km
Fires mapped since 1986 around where Repentigny’s residents live, and the fuel next to their homes.
The yearly burn rate around Repentigny is 0.001%, low beside 0.000% for the typical Canadian town.
Repentigny’s homes have had no fire within 5 km since 1986; the closest was 11 km away.
Only 3.7% of the land within 25 km of Repentigny is forest fuel, and 0.5% close in.
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
In the upper half in Quebec but far from Mistissini (0.31%): Repentigny ranks 136th of 513, at 0.001% 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.
Low, like 92% of the country’s 2,610 towns: the land around Repentigny burns, but slower than in the 7.5% above it.
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.
Repentigny is on the flood map inventory: 2 studies, latest by Gouvernement du Québec
Flood studies whose area touches Repentigny, from NRCan’s inventory, each linked to its owner.
2 studies on the inventory touch Repentigny, the newest Gouvernement du Québec’s from 1996, and their areas can be large, so they say maps exist, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| Varennes-Grondines | Gouvernement du Québec | 1996 | final |
| Charlemagne-Joliette | Gouvernement du Québec | 1981 | final |
Towns with a flood study on file
Its flood study sets Repentigny 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.
No single decade dominates: 2 studies for Repentigny between the 1980s and the 1990s.
Study dates as the NRCan inventory lists them, one count per study touching Repentigny.
Listed, not scored: a flood study proves a map exists, not that Repentigny floods.
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.
Earthquakes cost buildings in Repentigny $0.20 per $1,000 a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
Repentigny’s $0.20 is about 6.7 times the typical town’s $0.030: it sits in one of Canada’s more active seismic zones.
Shaking damage a year per $1,000 of building value
The typical town in Quebec expects $0.14 a year; Repentigny expects $0.20, and La Pocatière $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 12% of Canada’s 2,611 towns are above Repentigny.
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).
The loss is to Repentigny’s buildings alone, from ground shaking; infrastructure and secondary hazards are left out.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
3.9% of homes tested around Repentigny are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Measured across the Lanaudiere health region: radon tests
At 3.9% over the guideline, the area around Repentigny is under the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The median in Quebec is 8.2% over 200 Bq/m³; around Repentigny it is 3.9%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
63% of Canada’s 2,611 towns have a higher share of homes over 200 Bq/m³ than Repentigny’s 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.
Basements, soil and how a house is sealed decide its radon, so in Repentigny only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Repentigny
Alerts for Repentigny 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. |
Fire danger and active fires near Repentigny are mapped daily by the Canadian Wildland Fire Information System; evacuation orders come from the municipality or province.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Repentigny’s neighbours compare on hazards
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Repentigny | Low | $0.20 | 3.9% | Yes |
| Charlemagne 6,695 · 5.2 km | Low | $0.16 | 3.9% | Yes |
| Verchères 5,819 · 7.3 km | Low | $0.17 | 8.2% | Yes |
| Varennes 21,490 · 9.7 km | Low | $0.20 | 8.2% | Yes |
| Saint-Sulpice 3,688 · 10.0 km | Low | $0.16 | 3.9% | Yes |
| L'Assomption 25,126 · 10 km | Low | $0.18 | 3.9% | Yes |
| L'Épiphanie 9,254 · 10 km | Low | $0.19 | 3.9% | Yes |
The fire record around Saint-Sulpice is a touch heavier than Repentigny’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 Repentigny faces
Practical steps for Repentigny’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
- 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 Repentigny sits in.
- Earthquakes are modelled. Shaking damage is modelled from the ground, the buildings and the odds of each quake, and published for whole subdivisions such as Repentigny’s.
- 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 Repentigny floods.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Repentigny’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
Questions about flooding and hazards in Repentigny
Is Repentigny at risk of wildfire?
Not much by Canadian standards: Repentigny’s band is low, with 0% of the land within 25 km burned since 1986 (last in 2025), so wildfire doesn’t change its grade.
How big is the earthquake risk in Repentigny?
Expected earthquake damage in Repentigny comes to $0.20 a year for each $1,000 that buildings are worth.
How is Repentigny’s Hazard risk Grade worked out?
Hazard risk gives Repentigny C+, weighing earthquakes and radon and counting wildfire only against it.
Is radon a problem in Repentigny?
3.9% of the 77 homes Health Canada tested around Repentigny topped the guideline; your own house needs its own test.
Does Repentigny flood?
Repentigny’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
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).