Photo: Meliossa · CC BY-SA 3.0Flood mapping exists for Grand-Remous: 1 on record, latest by Gouvernement du Québec
Wildfire is rare near Grand-Remous: 0% of the land within 25 km has burned since 1986, a burn rate of 0.000% a year. Shaking is a bigger worry than in most places, at $0.093 a year per $1,000 of building value ($0.030 typical). More homes than usual carry radon here, 13% over the guideline where the typical town has 6.6%. Grand-Remous grades C− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Grand-Remous’s hazards
Four national sources, each read for Grand-Remous: earthquakes, radon, past fires and flood studies.
What Grand-Remous faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Grand-Remous grades C− for hazard risk
Seismic risk and radon set Grand-Remous’ grade, wildfire can drag it down, and flood mapping stays out of it.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Only 63 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.
Few fires near Grand-Remous: 0% within 5 km, 0% within 25 km
Past fire around Grand-Remous’ homes, from the national burned-area record, with the fuel within 5 km.
A burn rate of 0.000% a year keeps Grand-Remous in the low band (the typical Canadian town: 0.000%).
More forest grows near Grand-Remous’ homes (40% within 5 km) than across 25 km (34%).
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 Grand-Remous 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.
Only 7.5% of Canada’s 2,610 towns are above the low band, which holds 92%; Grand-Remous, at a rounded zero, is far from them.
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.
Grand-Remous is on the flood map inventory: 1 study, by Gouvernement du Québec
What Canada’s Flood Map Inventory lists for Grand-Remous: who studied flooding and where to see their maps.
Gouvernement du Québec holds the flood mapping that covers Grand-Remous (1978), linked below.
| Study | By | Year | Status |
|---|---|---|---|
| Farmers-Hull | Gouvernement du Québec | 1978 | final |
Towns with a flood study on file
Flood maps are thinner in Quebec, 45% of towns against 58% nationally, but Grand-Remous has one.
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 Grand-Remous 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 Grand-Remous $0.093 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Roughly 3.1 times the typical $0.030: Grand-Remous’ $0.093 marks real seismic exposure.
Shaking damage a year per $1,000 of building value
Earthquake risk in Quebec peaks in La Pocatière ($0.48); Grand-Remous, at $0.093, is below the median of $0.14.
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 26% of Canada’s 2,611 towns are above Grand-Remous.
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).
Roads, pipes and bridges aren’t in Grand-Remous’ figure, nor landslides or tsunami: it is buildings and shaking.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
13% of homes tested around Grand-Remous are over the radon guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Shared with the rest of the Outaouais health region: radon tests
Grand-Remous’ survey area reads 13% over the guideline, well past the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Grand-Remous, 13% of tests were over 200 Bq/m³ and 4.8% over 600, against a median of 8.2% in Quebec.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
More high tests than most: Grand-Remous sits in a band that only 22% of Canada’s 2,611 towns share, with 4.6% above.
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.
The survey sampled homes around Grand-Remous; it can’t tell you your basement’s level.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Grand-Remous
Alerts for Grand-Remous 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. |
Alert Ready carries evacuation orders for Grand-Remous to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Get ready for what Grand-Remous faces
Practical steps for Grand-Remous’ 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.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- Has it had a radon test?
- Check the address on the flood map.
- Are flood and wildfire insured?
What this data can and can’t tell you
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Grand-Remous’ figure is its subdivision’s.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Grand-Remous’ homes since 1986, a history of fire that may lower Risk but never raises it.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Grand-Remous 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 Grand-Remous.
Questions about flooding and hazards in Grand-Remous
Is Grand-Remous at risk of wildfire?
Some, but Grand-Remous’ low band (0% of nearby land burned since 1986, latest 2025) is short of the level that counts.
Does Grand-Remous flood?
The inventory lists a study touching Grand-Remous; whether a given street floods is on that map, not in the grade.
Is radon a problem in Grand-Remous?
The area’s survey found 13% of 63 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Grand-Remous.
How big is the earthquake risk in Grand-Remous?
In NRCan’s seismic model, Grand-Remous’ buildings lose $0.093 per $1,000 of value in an average year.
How is Grand-Remous’s Hazard risk Grade worked out?
Hazard risk gives Grand-Remous C−, weighing earthquakes and radon and counting wildfire only against it.
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).