Photo: Gordalmighty · CC BY-SA 3.0A flood study covers Saint-Denis-de-Brompton: 1 on the national inventory, the newest from Ville de Sherbrooke
The burned-area map is nearly blank around Saint-Denis-de-Brompton, 0% within 25 km since 1986, 0.000% a year. For earthquakes Saint-Denis-de-Brompton is middling, $0.047 a year per $1,000 against $0.030 for the typical town. Radon is about average around Saint-Denis-de-Brompton: 7.3% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Hazard risk gives Saint-Denis-de-Brompton a grade of B, from earthquakes and radon alone.
What stands out about Saint-Denis-de-Brompton’s hazards
For Saint-Denis-de-Brompton, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Denis-de-Brompton faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Saint-Denis-de-Brompton grades B for hazard risk
For Saint-Denis-de-Brompton, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #74 of 507 in Quebec and #1,479 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Only 55 homes were tested in the survey area, so the radon share is rough. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Few fires near Saint-Denis-de-Brompton: 0% within 5 km, 0% within 25 km
Past fire around Saint-Denis-de-Brompton’s homes, from the national burned-area record, with the fuel within 5 km.
Around Saint-Denis-de-Brompton fire takes 0.000% of the land in a typical year, the typical Canadian town 0.000%, which is low.
Nothing inside 5 km of Saint-Denis-de-Brompton’s homes has burned since 1986, and the nearest scar is 17 km off.
Forest fuel is denser close to Saint-Denis-de-Brompton (51% within 5 km) than further out (34% 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
Little or nothing burns around Saint-Denis-de-Brompton in a typical year; 144 of the 513 towns in Quebec share that, and 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.
Saint-Denis-de-Brompton shares the low band with 92% of Canada’s 2,610 towns, its burn rate rounding to nothing; 7.5% burn faster.
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.
Ville de Sherbrooke has mapped flooding for Saint-Denis-de-Brompton (1 study)
What Canada’s Flood Map Inventory lists for Saint-Denis-de-Brompton: who studied flooding and where to see their maps.
Ville de Sherbrooke studied flooding in an area that includes Saint-Denis-de-Brompton (2010); open its map to see which streets lie in a flood zone.
| Study | By | Year | Status |
|---|---|---|---|
| Sherbrooke Zones inondables | Ville de Sherbrooke | 2010 | final |
Towns with a flood study on file
Saint-Denis-de-Brompton is one of the 45% of towns in Quebec with a flood study on file, fewer than Canada’s 58%.
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 Saint-Denis-de-Brompton 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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
Expected shaking damage in Saint-Denis-de-Brompton: $0.047 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
1.6 times the typical $0.030: Saint-Denis-de-Brompton’s $0.047 is ordinary.
Shaking damage a year per $1,000 of building value
Saint-Denis-de-Brompton’s $0.047 sits under the median in Quebec, $0.14, and well under La Pocatière’s $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.
In the upper part of Canada’s range: 31% of its 2,611 towns expect more damage than Saint-Denis-de-Brompton.
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-Denis-de-Brompton 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).
Radon about average around Saint-Denis-de-Brompton: 7.3% over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Saint-Denis-de-Brompton’s area, at 7.3%, is close to the 6.6% of the typical Canadian town. Saint-Denis-de-Brompton doesn’t get its own radon tests figures; the ones here come from the Estrie health region.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon around Saint-Denis-de-Brompton is ordinary for towns in Quebec: 7.3%, 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.
37% of Canada’s 2,611 towns share Saint-Denis-de-Brompton’s band of 5 to 10%; 26% sit higher.
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 low area share in Saint-Denis-de-Brompton doesn’t clear a house, nor does a high one condemn it: test.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Saint-Denis-de-Brompton
Alerts for Saint-Denis-de-Brompton 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-Denis-de-Brompton 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 Saint-Denis-de-Brompton
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Denis-de-Brompton | Low | $0.047 | 7.3% | Yes |
| Saint-François-Xavier-de-Brompton 2,650 · 9.8 km | Low | $0.047 | 7.3% | Yes |
| Racine 1,441 · 9.9 km | Low | $0.041 | 7.3% | None listed |
| Windsor 5,368 · 15 km | Low | $0.044 | 7.3% | Yes |
| Orford 5,698 · 15 km | Low | $0.042 | 7.3% | Yes |
| Sherbrooke 184,135 · 15 km | Low | $0.043 | 7.3% | Yes |
| Valcourt 2,203 · 18 km | Low | $0.041 | 7.3% | Yes |
Nowhere around Saint-Denis-de-Brompton burns more: Saint-François-Xavier-de-Brompton, the closest rival, is low to its low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Denis-de-Brompton faces
Practical steps for Saint-Denis-de-Brompton’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.
- 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. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Saint-Denis-de-Brompton’s census subdivision (a neighbourhood shows its city’s).
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Saint-Denis-de-Brompton without grading them.
- Radon is a survey. Radon figures pool the survey’s home tests by area: postal areas once their boundaries arrive, the 2007 health region around Saint-Denis-de-Brompton until then.
- Wildfire counts one way. For Saint-Denis-de-Brompton, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
Questions about flooding and hazards in Saint-Denis-de-Brompton
How big is the earthquake risk in Saint-Denis-de-Brompton?
NRCan’s model expects shaking to cost buildings in Saint-Denis-de-Brompton $0.047 a year for every $1,000 of their value, on average over many years.
Does Saint-Denis-de-Brompton flood?
A flood study covers Saint-Denis-de-Brompton on Canada’s Flood Map Inventory; open the owner’s map to check a street, since flood isn’t graded.
How is Saint-Denis-de-Brompton’s Hazard risk Grade worked out?
Hazard risk gives Saint-Denis-de-Brompton B, weighing earthquakes and radon and counting wildfire only against it.
Is Saint-Denis-de-Brompton at risk of wildfire?
Some, but Saint-Denis-de-Brompton’s low band (0% of nearby land burned since 1986, latest 2016) is short of the level that counts.
Is radon a problem in Saint-Denis-de-Brompton?
The area’s survey found 7.3% of 55 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Saint-Denis-de-Brompton.
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).