Photo: Roncanada · CC BY 4.0Saint-Alphonse-Rodriguez faces few natural hazards: little fire nearby, low seismic risk, radon over the guideline in 3.9% of tested homes
Fire has left almost no mark near Saint-Alphonse-Rodriguez: 0% of the land within 25 km since 1986, 0.001% a year. Seismic risk runs high: $0.067 of expected damage per $1,000 of buildings a year, the typical town $0.030. Saint-Alphonse-Rodriguez grades B+ for hazard risk, with wildfire counted against it.
What stands out about Saint-Alphonse-Rodriguez’s hazards
For Saint-Alphonse-Rodriguez, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Alphonse-Rodriguez 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-Alphonse-Rodriguez: B+
Seismic risk and radon set Saint-Alphonse-Rodriguez’s grade, wildfire can drag it down, and flood mapping stays out of it.
Its place: #42 of 507 in Quebec and #1,373 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-Alphonse-Rodriguez: 0% within 5 km, 0% within 25 km
Past fire around Saint-Alphonse-Rodriguez’s homes, from the national burned-area record, with the fuel within 5 km.
Next to the typical Canadian town (0.000% a year), Saint-Alphonse-Rodriguez’s 0.001% is in the low band.
Saint-Alphonse-Rodriguez’s homes have had no fire within 5 km since 1986; the closest was 9.7 km away.
The ring nearest Saint-Alphonse-Rodriguez is the most wooded: 46% forest fuel within 5 km against 35% 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
In the upper half in Quebec but far from Mistissini (0.31%): Saint-Alphonse-Rodriguez ranks 136th of 513, at 0.001% a year.
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-Alphonse-Rodriguez, 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.
The flood map inventory lists nothing for Saint-Alphonse-Rodriguez
What Canada’s Flood Map Inventory lists for Saint-Alphonse-Rodriguez: who studied flooding and where to see their maps.
NRCan’s inventory is silent on Saint-Alphonse-Rodriguez, so any flood map would be the municipality’s own.
Towns with a flood study on file
Saint-Alphonse-Rodriguez has no flood study on file; only 45% of towns in Quebec do, against 58% across Canada.
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-Alphonse-Rodriguez 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.”
Earthquakes cost buildings in Saint-Alphonse-Rodriguez $0.067 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Roughly 2.2 times the typical $0.030: Saint-Alphonse-Rodriguez’s $0.067 marks real seismic exposure.
Shaking damage a year per $1,000 of building value
Saint-Alphonse-Rodriguez’s $0.067 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: 29% of its 2,611 towns expect more damage than Saint-Alphonse-Rodriguez.
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-Alphonse-Rodriguez 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 low around Saint-Alphonse-Rodriguez: 3.9% of tested homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Shared with the rest of the Lanaudiere health region: radon tests
Saint-Alphonse-Rodriguez’s area, at 3.9%, is below the 6.6% of the typical Canadian town, though any one home can still be high.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Against the typical town in Quebec (8.2%), the area around Saint-Alphonse-Rodriguez has fewer high tests: 3.9%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Few tests over the guideline: Saint-Alphonse-Rodriguez shares the bottom band with 37% of Canada’s 2,611 towns, below the other 63%.
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.
Neighbouring homes in Saint-Alphonse-Rodriguez can differ a lot; only a long-term test tells you about yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Saint-Alphonse-Rodriguez
Alerts for Saint-Alphonse-Rodriguez 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 Saint-Alphonse-Rodriguez to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Saint-Alphonse-Rodriguez’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-Alphonse-Rodriguez | Low | $0.067 | 3.9% | None listed |
| Sainte-Béatrix 2,388 · 6.6 km | Low | $0.065 | 3.9% | None listed |
| Sainte-Marcelline-de-Kildare 1,941 · 11 km | Low | $0.064 | 3.9% | None listed |
| Saint-Côme 2,810 · 13 km | Low | $0.046 | 3.9% | None listed |
| Rawdon 13,099 · 13 km | Low | $0.085 | 3.9% | None listed |
| Saint-Jean-de-Matha 5,415 · 14 km | Low | $0.068 | 3.9% | Yes |
| Sainte-Émélie-de-l'Énergie 1,856 · 17 km | Low | $0.048 | 3.9% | Yes |
The fire record around Saint-Côme is a touch heavier than Saint-Alphonse-Rodriguez’s, but the band is the same: low (here low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Alphonse-Rodriguez faces
Practical steps for Saint-Alphonse-Rodriguez’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?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
What this data can and can’t tell you
- 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-Alphonse-Rodriguez sits in.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Saint-Alphonse-Rodriguez’s included.
- 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-Alphonse-Rodriguez.
- 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-Alphonse-Rodriguez floods.
Questions about flooding and hazards in Saint-Alphonse-Rodriguez
Is radon a problem in Saint-Alphonse-Rodriguez?
The area’s survey found 3.9% of 77 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Saint-Alphonse-Rodriguez.
Does Saint-Alphonse-Rodriguez flood?
The inventory has 0 studies for Saint-Alphonse-Rodriguez, and an empty list isn’t a clean bill: the municipality holds any flood maps.
Is Saint-Alphonse-Rodriguez at risk of wildfire?
Some, but Saint-Alphonse-Rodriguez’s low band (0% of nearby land burned since 1986, latest 2025) is short of the level that counts.
How is Saint-Alphonse-Rodriguez’s Hazard risk Grade worked out?
Saint-Alphonse-Rodriguez’s Hazard risk grade is B+, built on earthquakes and radon with a one-sided wildfire input.
How big is the earthquake risk in Saint-Alphonse-Rodriguez?
In NRCan’s seismic model, Saint-Alphonse-Rodriguez’s buildings lose $0.067 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).