Photo: Michelsimard · CC BY-SA 4.0Hazards in Très-Saint-Rédempteur: wildfire low, radon over the guideline in 8.2% of tested homes
Wildfire isn’t Très-Saint-Rédempteur’s worry: 0% of the land within 25 km burned since 1986 (0.000% a year). Shaking is a bigger worry than in most places, at $0.18 a year per $1,000 of building value ($0.030 typical). Très-Saint-Rédempteur grades C− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Très-Saint-Rédempteur’s hazards
Four national sources, each read for Très-Saint-Rédempteur: earthquakes, radon, past fires and flood studies.
What Très-Saint-Rédempteur faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Très-Saint-Rédempteur: C−
Two inputs always count for Très-Saint-Rédempteur, earthquakes and radon; the third, wildfire, counts only against a town.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Small fires and grass fires are largely missing from the national burned-area record.
Little of the land around Très-Saint-Rédempteur has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Très-Saint-Rédempteur’s residents live, and the fuel next to their homes.
The land within 25 km of Très-Saint-Rédempteur burns at 0.000% a year on average, the low band; the typical Canadian town: 0.000%.
Since 1986 the nearest fire to Très-Saint-Rédempteur’s homes came within 24 km, never inside 5 km.
Little near Très-Saint-Rédempteur’s homes can carry a forest fire; only 3.3% of the land within 5 km is forest fuel, and 4.1% 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 514
To three decimals the burn rate around Très-Saint-Rédempteur is zero, as for 145 of the 514 towns in Quebec, while 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.
The low band holds 92% of Canada’s 2,610 towns, and Très-Saint-Rédempteur sits at its very bottom; only 7.5% are 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.
No flood study is listed for Très-Saint-Rédempteur
Flood studies whose area touches Très-Saint-Rédempteur, from NRCan’s inventory, each linked to its owner.
There is no study for Très-Saint-Rédempteur on the national flood inventory, which is far from complete.
Towns with a flood study on file
Only 45% of towns in Quebec have a flood study, short of Canada’s 58%, and Très-Saint-Rédempteur is not among them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood mapping is shown for Très-Saint-Rédempteur to be opened and checked, never turned into a grade.
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.”
High seismic risk in Très-Saint-Rédempteur: $0.18 per $1,000 of buildings a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
The typical town loses $0.030 a year to shaking; Très-Saint-Rédempteur loses $0.18, 5.9 times as much.
Shaking damage a year per $1,000 of building value
The typical town in Quebec expects $0.14 a year; Très-Saint-Rédempteur expects $0.18, 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 14% of Canada’s 2,611 towns are above Très-Saint-Rédempteur.
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 model counts damage to Très-Saint-Rédempteur’s buildings and their occupants from shaking only: not liquefaction, landslides, tsunami or fires after a quake.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
8.2% of homes tested around Très-Saint-Rédempteur are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Source area for radon tests: the Monteregie health region
At 8.2% over the guideline, the area around Très-Saint-Rédempteur is about level with the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Très-Saint-Rédempteur’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 Très-Saint-Rédempteur’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.
A survey sample isn’t a map: any home in Très-Saint-Rédempteur can be high, and a three-month test is the only way to know.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Très-Saint-Rédempteur
Alerts for Très-Saint-Rédempteur 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 Très-Saint-Rédempteur 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)
Hazards in the places around Très-Saint-Rédempteur
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Très-Saint-Rédempteur | Low | $0.18 | 8.2% | None listed |
| Rigaud 8,187 · 6.4 km | Low | $0.14 | 8.2% | Yes |
| Sainte-Marthe 1,065 · 7.9 km | Low | $0.14 | 8.2% | None listed |
| Saint-Clet 1,784 · 15 km | Low | $0.18 | 8.2% | None listed |
| Saint-André-d'Argenteuil 3,300 · 15 km | Low | $0.14 | 10% | Yes |
| East Hawkesbury 3,787 · 15 km | Low | $0.20 | 6.1% | None listed |
| Saint-Polycarpe 2,549 · 15 km | Low | $0.18 | 8.2% | None listed |
Sainte-Marthe burns a little more than Très-Saint-Rédempteur, 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 Très-Saint-Rédempteur faces
What to do about the hazards Très-Saint-Rédempteur 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. The wildfire figure is the share of land within 25 km of Très-Saint-Rédempteur’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
- 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 Très-Saint-Rédempteur’s.
- 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 Très-Saint-Rédempteur.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Très-Saint-Rédempteur takes its 2007 health region’s share.
Questions about flooding and hazards in Très-Saint-Rédempteur
How is Très-Saint-Rédempteur’s Hazard risk Grade worked out?
Hazard risk gives Très-Saint-Rédempteur C−, weighing earthquakes and radon and counting wildfire only against it.
Is radon a problem in Très-Saint-Rédempteur?
Around Très-Saint-Rédempteur, 110 survey homes were tested and 8.2% came in over 200 Bq/m³, a guide to the area, not to any one home.
How big is the earthquake risk in Très-Saint-Rédempteur?
About $0.18 a year per $1,000 of building value, NRCan’s long-run expectation for Très-Saint-Rédempteur.
Is Très-Saint-Rédempteur at risk of wildfire?
Fire has reached 0% of the land around Très-Saint-Rédempteur since 1986 (last in 2021); at low, it neither helps nor hurts the grade.
Does Très-Saint-Rédempteur flood?
With 0 studies on the inventory, Très-Saint-Rédempteur’s flood risk is unmapped nationally; check with the municipality before buying.
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).