Photo: Simon.bastien · Public domainHazards in Saint-Sulpice: wildfire low, radon over the guideline in 6.8% of tested homes
Little of the land around Saint-Sulpice has burned: 0.1% within 25 km since 1986, or 0.002% a year. Earthquakes add more: NRCan’s model puts building losses at $0.20 a year per $1,000 of value, against $0.030 for the typical town. Hazard risk gives Saint-Sulpice a grade of C, from earthquakes and radon alone.
What stands out about Saint-Sulpice’s hazards
Four national sources, each read for Saint-Sulpice: earthquakes, radon, past fires and flood studies.
What Saint-Sulpice faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Saint-Sulpice grades C for hazard risk
For Saint-Sulpice, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #161 of 507 in Quebec and #2,110 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. The radon share rests on 74 home tests in the survey area, so a few homes move it. Small fires and grass fires are largely missing from the national burned-area record.
Little of the land around Saint-Sulpice has burned: 0% within 5 km, 0.1% within 25 km since 1986
Past fire around Saint-Sulpice’s homes, from the national burned-area record, with the fuel within 5 km.
Fire claims 0.002% of the land around Saint-Sulpice each year, a low band, with the typical Canadian town at 0.000%.
The 5 km ring around Saint-Sulpice’s homes is clear of burns since 1986, the nearest 16 km out.
Land that isn’t forest covers nearly all the ground around Saint-Sulpice: forest fuel is 0.1% within 5 km and 1.7% 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
At 0.002% a year, Saint-Sulpice is near the top in Quebec: 35th of 513, behind Mistissini (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-Sulpice is in the low band with 92% of Canada’s 2,610 towns; 7.5% sit in moderate or 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.
The flood map inventory lists nothing for Saint-Sulpice
What Canada’s Flood Map Inventory lists for Saint-Sulpice: who studied flooding and where to see their maps.
There is no study for Saint-Sulpice on the national flood inventory, which is far from complete.
Towns with a flood study on file
No study touches Saint-Sulpice; in Quebec, 45% of towns have one, below Canada’s 58%.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Nothing here counts toward Risk; the studies are pointers to the maps their owners keep for Saint-Sulpice.
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.”
Earthquakes cost buildings in Saint-Sulpice $0.20 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Roughly 6.7 times the typical $0.030: Saint-Sulpice’s $0.20 marks real seismic exposure.
Shaking damage a year per $1,000 of building value
Saint-Sulpice’s $0.20 tops the median in Quebec, $0.14, though La Pocatière reaches $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.
Only 8.5% of Canada’s 2,611 towns expect more shaking damage than Saint-Sulpice.
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 Saint-Sulpice’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). · Earthquake risk: one figure for all of the city of Montréal
Some radon around Saint-Sulpice: 6.8% of area homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Near the middle for radon: Saint-Sulpice’s area 6.8%, the typical Canadian town 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Saint-Sulpice’s area, at 6.8%, 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.
Between 5% and 10% of tests over the guideline: Saint-Sulpice, and 37% of Canada’s 2,611 towns; 26% are 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.
Basements, soil and how a house is sealed decide its radon, so in Saint-Sulpice only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Not measured by town: radon tests (the Montreal health region)
Weather and fire alerts for Saint-Sulpice
Environment and Climate Change Canada issues the weather alerts for Saint-Sulpice; Alert Ready carries the urgent ones to phones, radio and TV.
| 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. |
In fire season, check CWFIS for danger and active fires around Saint-Sulpice, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Saint-Sulpice’s neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Sulpice | Low | $0.20 | 6.8% | None listed |
| Sault-au-Récollet 25,464 · 1.5 km | Low | $0.20 | 6.8% | None listed |
| Nicolas-Viel 19,361 · 1.8 km | Low | $0.20 | 6.8% | None listed |
| Crémazie 29,907 · 1.9 km | Low | $0.20 | 6.8% | None listed |
| Parc-Jarry 15,699 · 1.9 km | Low | $0.20 | 6.8% | None listed |
| La Visitation 17,166 · 2.4 km | Low | $0.20 | 6.8% | None listed |
| Sainte-Lucie 22,574 · 2.4 km | Low | $0.20 | 6.8% | None listed |
The neighbour with the most fire is Crémazie (low), still no more than Saint-Sulpice (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Sulpice faces
Practical steps for Saint-Sulpice’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?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
- Is earthquake cover included?
What this data can and can’t tell you
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Saint-Sulpice without grading them.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Saint-Sulpice’s homes since 1986, a history of fire that may lower Risk but never raises it.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Saint-Sulpice’s figure is its subdivision’s.
- 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-Sulpice until then.
Questions about flooding and hazards in Saint-Sulpice
How big is the earthquake risk in Saint-Sulpice?
In NRCan’s seismic model, Saint-Sulpice’s buildings lose $0.20 per $1,000 of value in an average year.
Is Saint-Sulpice at risk of wildfire?
Some, but Saint-Sulpice’s low band (0.1% of nearby land burned since 1986, latest 2025) is short of the level that counts.
Does Saint-Sulpice flood?
The inventory has 0 studies for Saint-Sulpice, and an empty list isn’t a clean bill: the municipality holds any flood maps.
Is radon a problem in Saint-Sulpice?
The area’s survey found 6.8% of 74 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Saint-Sulpice.
How is Saint-Sulpice’s Hazard risk Grade worked out?
Hazard risk gives Saint-Sulpice 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).