Photo: Gabriel Picard · CC BY-SA 4.0Hazard risk in Saint-Janvier-de-Joly is higher than in 91% of Canadian towns
Since 1986 almost nothing has burned near Saint-Janvier-de-Joly: 0% of the land within 25 km, or 0.000% a year. Shaking is a bigger worry than in most places, at $0.13 a year per $1,000 of building value ($0.030 typical). More homes than usual carry radon here, 13% over the guideline where the typical town has 6.6%. Saint-Janvier-de-Joly grades D for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Saint-Janvier-de-Joly’s hazards
Four national sources, each read for Saint-Janvier-de-Joly: earthquakes, radon, past fires and flood studies.
What Saint-Janvier-de-Joly faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Saint-Janvier-de-Joly grades D for hazard risk
The grade weighs Saint-Janvier-de-Joly’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Small fires and grass fires are largely missing from the national burned-area record.
Wildfire is rare near Saint-Janvier-de-Joly: 0% of the land within 25 km burned since 1986, 0% within 5 km
Past fire around Saint-Janvier-de-Joly’s homes, from the national burned-area record, with the fuel within 5 km.
Low by Canadian standards: 0.000% of the land a year around Saint-Janvier-de-Joly, 0.000% for the typical Canadian town.
Forest fuel is spread evenly around Saint-Janvier-de-Joly: 40% within 5 km, 37% 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 514
Mistissini has the highest burn rate in Quebec, 0.31% a year; around Saint-Janvier-de-Joly, as around 145 of the 514 towns, it rounds to zero.
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.
Like most of Canada’s 2,610 towns (92%), Saint-Janvier-de-Joly is in the low band, with a burn rate of zero to three decimals; 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.
No flood study is listed for Saint-Janvier-de-Joly
What Canada’s Flood Map Inventory lists for Saint-Janvier-de-Joly: who studied flooding and where to see their maps.
There is no study for Saint-Janvier-de-Joly on the national flood inventory, which is far from complete.
Towns with a flood study on file
No study touches Saint-Janvier-de-Joly; 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.
Flood mapping is shown for Saint-Janvier-de-Joly 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.”
High seismic risk in Saint-Janvier-de-Joly: $0.13 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-Janvier-de-Joly loses $0.13, 4.4 times as much.
Shaking damage a year per $1,000 of building value
Shaking damage around Saint-Janvier-de-Joly runs at $0.13 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.
More earthquake risk than most: only 22% of Canada’s 2,611 towns are above Saint-Janvier-de-Joly.
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).
Roads, pipes and bridges aren’t in Saint-Janvier-de-Joly’s figure, nor landslides or tsunami: it is buildings and shaking.
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-Janvier-de-Joly: 13% of tested homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
A higher share than most: 13% of tested homes around Saint-Janvier-de-Joly, the typical Canadian town 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Saint-Janvier-de-Joly, 13% of tests were over 200 Bq/m³ and 0.6% 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.
4.6% of Canada’s 2,611 towns have a higher share of homes over 200 Bq/m³ than Saint-Janvier-de-Joly, in the 10–20% band with 22%.
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.
The share describes the area, not a house: in Saint-Janvier-de-Joly as anywhere, test to be sure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Area behind the radon tests figures: the Chaudiere-Appalaches health region
Weather and fire alerts for Saint-Janvier-de-Joly
Alerts for Saint-Janvier-de-Joly 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-Janvier-de-Joly 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)
How Saint-Janvier-de-Joly’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-Janvier-de-Joly | Low | $0.13 | 13% | None listed |
| Laurier-Station 2,838 · 7.0 km | Low | $0.14 | 13% | None listed |
| Saint-Flavien 1,682 · 8.2 km | Low | $0.12 | 13% | None listed |
| Val-Alain 1,084 · 11 km | Low | $0.13 | 13% | None listed |
| Lyster 1,679 · 14 km | Low | $0.12 | 0% | None listed |
| Sainte-Croix 2,612 · 14 km | Low | $0.13 | 13% | None listed |
| Saint-Édouard-de-Lotbinière 1,295 · 15 km | Low | $0.15 | 13% | None listed |
The fire record around Sainte-Croix is a touch heavier than Saint-Janvier-de-Joly’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-Janvier-de-Joly faces
What to do about the hazards Saint-Janvier-de-Joly 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?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
- Is earthquake cover included?
What this data can and can’t tell you
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Saint-Janvier-de-Joly takes its 2007 health region’s share.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Saint-Janvier-de-Joly’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-Janvier-de-Joly’s figure is its subdivision’s.
- Flood studies aren’t flood zones. The flood inventory points to maps; it is incomplete and not the official source, so ask the municipality about any street in Saint-Janvier-de-Joly.
Questions about flooding and hazards in Saint-Janvier-de-Joly
How big is the earthquake risk in Saint-Janvier-de-Joly?
In NRCan’s seismic model, Saint-Janvier-de-Joly’s buildings lose $0.13 per $1,000 of value in an average year.
How is Saint-Janvier-de-Joly’s Hazard risk Grade worked out?
Hazard risk gives Saint-Janvier-de-Joly D, weighing earthquakes and radon and counting wildfire only against it.
Is Saint-Janvier-de-Joly at risk of wildfire?
The burned-area record shows next to nothing around Saint-Janvier-de-Joly (0% within 25 km since 1986), so its band is low.
Is radon a problem in Saint-Janvier-de-Joly?
Around Saint-Janvier-de-Joly, 175 survey homes were tested and 13% came in over 200 Bq/m³, a guide to the area, not to any one home.
Does Saint-Janvier-de-Joly flood?
With 0 studies on the inventory, Saint-Janvier-de-Joly’s flood risk is unmapped nationally; check with the municipality before buying.
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).