Photo: Bibliothèque et Archives nationales du Québec · Public domainSaint-Robert is on Canada’s flood inventory: 1 listed, led by Gouvernement du Québec
Around Saint-Robert, wildfire is practically absent from the record: 0% within 25 km since 1986, 0.001% a year. Shaking is a bigger worry than in most places, at $0.15 a year per $1,000 of building value ($0.030 typical). Radon around Saint-Robert is ordinary for Canada: 8.2% of tested homes over the guideline (6.6% typical). Hazard risk gives Saint-Robert a grade of C, from earthquakes and radon alone.
What stands out about Saint-Robert’s hazards
For Saint-Robert, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Robert faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Saint-Robert grades C for hazard risk
Risk averages earthquakes and radon; wildfire joins only where it pulls the average down, so a town like Saint-Robert with little fire nearby would get no credit for it.
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-Robert has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Saint-Robert’s residents live, and the fuel next to their homes.
A burn rate of 0.001% a year keeps Saint-Robert in the low band (the typical Canadian town: 0.000%).
No fire has burned within 5 km of Saint-Robert’s homes since 1986; the nearest burn is 6.7 km away.
Near or far, forest fuel covers a similar share around Saint-Robert: 5.5% within 5 km and 4.8% 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 514
At 0.001% a year, Saint-Robert ranks 136th of the 514 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.
Some fire is mapped around Saint-Robert, but not enough to leave the low band, where 92% of Canada’s 2,610 towns are; 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.
Gouvernement du Québec has mapped flooding for Saint-Robert (1 study)
Flood studies whose area touches Saint-Robert, from NRCan’s inventory, each linked to its owner.
For Saint-Robert the inventory points to Gouvernement du Québec’s 1996 study, whose map is the one to check.
| Study | By | Year | Status |
|---|---|---|---|
| Varennes-Grondines | Gouvernement du Québec | 1996 | final |
Towns with a flood study on file
Only 45% of towns in Quebec have a flood study, short of Canada’s 58%; Saint-Robert is one of them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Listed, not scored: a flood study proves a map exists, not that Saint-Robert 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.
Shaking is Saint-Robert’s costliest hazard: $0.15 a year per $1,000
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; Saint-Robert loses $0.15, 4.9 times as much.
Shaking damage a year per $1,000 of building value
Shaking damage around Saint-Robert runs at $0.15 a year, near the $0.14 of the typical town in Quebec; La Pocatière has $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 20% of Canada’s 2,611 towns are above Saint-Robert.
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-Robert 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).
Radon about average around Saint-Robert: 8.2% over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
The survey area of Saint-Robert reads 8.2%, a shade from the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon around Saint-Robert is ordinary for towns in Quebec: 8.2%, beside a median of 8.2%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Saint-Robert is in the 5–10% band with 37% of Canada’s 2,611 towns; 26% have 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.
Whatever Saint-Robert’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). · Radon tests: one figure for all of the Monteregie health region
Where to get warnings in Saint-Robert
Alerts for Saint-Robert 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 Saint-Robert 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 Saint-Robert’s neighbours compare on hazards
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Robert | Low | $0.15 | 8.2% | Yes |
| Yamaska 1,815 · 4.7 km | Low | $0.14 | 8.2% | Yes |
| Sainte-Anne-de-Sorel 2,770 · 9.6 km | Low | $0.12 | 8.2% | Yes |
| Sainte-Victoire-de-Sorel 2,599 · 9.7 km | Low | $0.13 | 8.2% | Yes |
| Sorel-Tracy 36,537 · 12 km | Low | $0.15 | 8.2% | Yes |
| Saint-Joseph-de-Sorel 1,602 · 13 km | Low | $0.18 | 8.2% | Yes |
| Saint-Ignace-de-Loyola 2,170 · 14 km | Low | $0.11 | 3.9% | Yes |
Yamaska (low) has the heaviest fire record of Saint-Robert’s neighbours, and Saint-Robert (low) matches or beats it.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Robert faces
What to do about the hazards Saint-Robert 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
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Saint-Robert’s census subdivision (a neighbourhood shows its city’s).
- 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-Robert.
- Wildfire counts one way. For Saint-Robert, 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-Robert is its health region’s, the survey’s design unit.
Questions about flooding and hazards in Saint-Robert
How is Saint-Robert’s Hazard risk Grade worked out?
Saint-Robert’s Hazard risk grade is C, built on earthquakes and radon with a one-sided wildfire input.
Is radon a problem in Saint-Robert?
Around Saint-Robert, 110 survey homes were tested and 8.2% came in over 200 Bq/m³, a guide to the area, not to any one home.
Does Saint-Robert flood?
There is flood mapping for Saint-Robert on the national inventory, each study linked to its owner’s map, none of them graded.
How big is the earthquake risk in Saint-Robert?
About $0.15 a year per $1,000 of building value, NRCan’s long-run expectation for Saint-Robert.
Is Saint-Robert at risk of wildfire?
Fire has reached 0% of the land around Saint-Robert since 1986 (last in 2022); at low, it neither helps nor hurts 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).