Photo: Nicogag · CC BY-SA 3.0Saint-Antonin faces more hazards than 94% of Canadian towns
Fire seldom reaches Saint-Antonin: since 1986, 0.1% of the land within 25 km has burned (0.004% a year). Earthquakes add more: NRCan’s model puts building losses at $0.24 a year per $1,000 of value, against $0.030 for the typical town. More homes than usual carry radon here, 14% over the guideline where the typical town has 6.6%. Hazard risk gives Saint-Antonin a grade of D, from earthquakes and radon alone.
What stands out about Saint-Antonin’s hazards
For Saint-Antonin, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Antonin 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-Antonin: D
The grade weighs Saint-Antonin’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
Its place: #501 of 507 in Quebec and #2,528 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Saint-Antonin has burned: 1% within 5 km, 0.1% within 25 km since 1986
Past fire around Saint-Antonin’s homes, from the national burned-area record, with the fuel within 5 km.
Low by Canadian standards: 0.004% of the land a year around Saint-Antonin, 0.000% for the typical Canadian town.
Forest fuel is spread evenly around Saint-Antonin: 52% within 5 km, 55% 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
Saint-Antonin ranks 29th of the 513 towns in Quebec for burn rate, at 0.004% a year; Mistissini leads with 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.
7.5% of Canada’s 2,610 towns burn fast enough to rank moderate or above; Saint-Antonin stays low, with 92%.
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-Antonin (1 study)
What Canada’s Flood Map Inventory lists for Saint-Antonin: who studied flooding and where to see their maps.
One study on the inventory touches Saint-Antonin, Gouvernement du Québec’s from 2005, and its area can be large, so it says a map exists, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| St-Antonin | Gouvernement du Québec | 2005 | final |
Towns with a flood study on file
Saint-Antonin 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 is shown here, never graded: a study says where a map exists, not how many of Saint-Antonin’s homes stand in a flood zone.
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-Antonin: $0.24 per $1,000 of buildings a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
At $0.24 per $1,000, Saint-Antonin carries roughly 8.1 times the typical Canadian town’s earthquake risk ($0.030).
Shaking damage a year per $1,000 of building value
At $0.24, Saint-Antonin is above the typical town in Quebec ($0.14); La Pocatière has the most at $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.
Few of Canada’s 2,611 towns face more earthquake damage than Saint-Antonin: 6.3% of them.
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-Antonin 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 runs high around Saint-Antonin: 14% of tested homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Saint-Antonin’s area, at 14%, is above the 6.6% of the typical Canadian town, so testing is worth more here than most places.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Saint-Antonin, 14% of tests were over 200 Bq/m³ and 1.8% 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: Saint-Antonin 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.
Radon varies from house to house in Saint-Antonin, so the survey is a reason to test, not a result for yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Not measured by town: radon tests (the Bas-Saint-Laurent health region)
Where to get warnings in Saint-Antonin
Environment and Climate Change Canada issues the weather alerts for Saint-Antonin; 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. |
For fires near Saint-Antonin, the national fire information system maps danger and active fires daily; local authorities give any evacuation order.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Saint-Antonin
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Antonin | Low | $0.24 | 14% | Yes |
| Saint-Modeste 1,182 · 7.0 km | Low | $0.20 | 14% | None listed |
| Rivière-du-Loup 20,650 · 7.7 km | Low | $0.28 | 14% | None listed |
| Notre-Dame-du-Portage 1,341 · 9.4 km | Low | $0.27 | 14% | None listed |
| Saint-Alexandre-de-Kamouraska 2,509 · 14 km | Low | $0.37 | 14% | Yes |
| Cacouna 1,888 · 15 km | Low | $0.21 | 14% | None listed |
| Saint-Arsène 1,269 · 17 km | Low | $0.19 | 14% | None listed |
Cacouna burns a little more than Saint-Antonin, in the same low band (low here).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Antonin faces
What to do about the hazards Saint-Antonin 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. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Saint-Antonin’s included.
- 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-Antonin 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-Antonin sits in.
- Wildfire counts one way. Burned land within 25 km of where people live, averaged over 1986–2025 and checked for fuel near homes, is the measure; it looks back, not ahead, and only ever counts against Saint-Antonin.
Questions about flooding and hazards in Saint-Antonin
How big is the earthquake risk in Saint-Antonin?
NRCan’s model expects shaking to cost buildings in Saint-Antonin $0.24 a year for every $1,000 of their value, on average over many years.
Is Saint-Antonin at risk of wildfire?
Less than most of Canada: 0.1% of the land within 25 km of Saint-Antonin has burned since 1986, the last in 2018, a low band that leaves Risk alone.
Is radon a problem in Saint-Antonin?
In Health Canada’s survey, 14% of 171 homes tested in Saint-Antonin’s area were above 200 Bq/m³, though only a test tells you about one house.
How is Saint-Antonin’s Hazard risk Grade worked out?
Saint-Antonin’s Hazard risk grade is D, built on earthquakes and radon with a one-sided wildfire input.
Does Saint-Antonin flood?
Saint-Antonin’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
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).