Photo: Antho116 · CC BY-SA 3.0Saint-Sulpice is on Canada’s flood inventory: 1 listed, led by Gouvernement du Québec
Little of the land around Saint-Sulpice has burned: 0.1% within 25 km since 1986, or 0.002% a year. Seismic risk runs high: $0.16 of expected damage per $1,000 of buildings a year, the typical town $0.030. In Health Canada’s survey, just 3.9% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Hazard risk gives Saint-Sulpice a grade of B−; its wildfire band pulls it down.
What stands out about Saint-Sulpice’s hazards
For Saint-Sulpice, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Sulpice faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Saint-Sulpice: B−
Two inputs always count for Saint-Sulpice, earthquakes and radon; the third, wildfire, counts only against a town.
Its place: #97 of 507 in Quebec and #1,722 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Only 77 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-Sulpice: 0.1% within 5 km, 0.1% within 25 km
Past fire around Saint-Sulpice’s homes, from the national burned-area record, with the fuel within 5 km.
Saint-Sulpice burns at 0.002% a year, low against 0.000% for the typical Canadian town.
Homes in Saint-Sulpice sit on open or built-up ground (2.1% forest fuel within 5 km); the wider 25 km holds 5%.
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.
Some fire is mapped around Saint-Sulpice, 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.
A flood study covers Saint-Sulpice, from Gouvernement du Québec: 1 on the inventory
What Canada’s Flood Map Inventory lists for Saint-Sulpice: who studied flooding and where to see their maps.
One study on the inventory touches Saint-Sulpice, Gouvernement du Québec’s from 1996, and its area can be large, so it says a map exists, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| Varennes-Grondines | Gouvernement du Québec | 1996 | final |
Towns with a flood study on file
Its flood study sets Saint-Sulpice apart in Quebec, where 45% of towns have one (Canada: 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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
High seismic risk in Saint-Sulpice: $0.16 per $1,000 of buildings a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
The typical town loses $0.030 a year to shaking; Saint-Sulpice loses $0.16, 5.4 times as much.
Shaking damage a year per $1,000 of building value
Shaking damage around Saint-Sulpice runs at $0.16 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.
Saint-Sulpice sits above most of Canada’s 2,611 towns on earthquake risk; 14% are higher.
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-Sulpice 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).
3.9% of homes tested around Saint-Sulpice are over the radon guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Where the typical Canadian town has 6.6% of homes over the guideline, Saint-Sulpice’s area has fewer, 3.9%. Saint-Sulpice doesn’t get its own radon tests figures; the ones here come from the Lanaudiere health region.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs lower around Saint-Sulpice than in most towns in Quebec: 3.9% against 8.2%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Radon rarely tops the guideline around Saint-Sulpice, as for 37% of Canada’s 2,611 towns; 63% see 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.
Health Canada advises testing every home, Saint-Sulpice’s included, whatever the area’s figure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in 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. |
Smoke and fire warnings for Saint-Sulpice come through Environment Canada and Alert Ready; the fire map is CWFIS’s.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Saint-Sulpice
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Sulpice | Low | $0.16 | 3.9% | Yes |
| L'Assomption 25,126 · 5.1 km | Low | $0.18 | 3.9% | Yes |
| Verchères 5,819 · 6.2 km | Low | $0.17 | 8.2% | Yes |
| Lavaltrie 15,996 · 8.2 km | Low | $0.15 | 3.9% | Yes |
| Repentigny 91,290 · 10.0 km | Low | $0.20 | 3.9% | Yes |
| L'Épiphanie 9,254 · 10 km | Low | $0.19 | 3.9% | Yes |
| Contrecoeur 10,708 · 12 km | Low | $0.12 | 8.2% | Yes |
Nowhere around Saint-Sulpice burns more: L'Assomption, 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-Sulpice faces
What to do about the hazards Saint-Sulpice 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-Sulpice’s census subdivision (a neighbourhood shows its city’s).
- Wildfire counts one way. For Saint-Sulpice, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
- Flood studies aren’t flood zones. A study’s area can be a whole watershed or province, so being on the inventory says a map exists, not that a home in Saint-Sulpice floods.
- Radon is a survey. The radon share comes from about 14,000 long-term home tests in 2009–2011, pooled for now by the 2007 health region Saint-Sulpice sits in.
Questions about flooding and hazards in Saint-Sulpice
How is Saint-Sulpice’s Hazard risk Grade worked out?
Hazard risk gives Saint-Sulpice B−, weighing earthquakes and radon and counting wildfire only against it.
Does Saint-Sulpice flood?
Saint-Sulpice’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
Is Saint-Sulpice at risk of wildfire?
Fire has reached 0.1% of the land around Saint-Sulpice since 1986 (last in 2025); at low, it neither helps nor hurts the grade.
Is radon a problem in Saint-Sulpice?
Around Saint-Sulpice, 77 survey homes were tested and 3.9% came in over 200 Bq/m³, a guide to the area, not to any one home.
How big is the earthquake risk in Saint-Sulpice?
In NRCan’s seismic model, Saint-Sulpice’s buildings lose $0.16 per $1,000 of value in an average year.
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).