Photo: Gabriel Picard · CC BY-SA 4.0Deschambault-Grondines’ hazards at a glance: a low wildfire record and 8.8% of area homes over the radon guideline
Burn scars are few around Deschambault-Grondines, with 0% of the land within 25 km touched by fire since 1986 (0.001% a year). Seismic risk runs high: $0.12 of expected damage per $1,000 of buildings a year, the typical town $0.030. Deschambault-Grondines grades C for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Deschambault-Grondines’s hazards
For Deschambault-Grondines, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Deschambault-Grondines faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Deschambault-Grondines grades C for hazard risk
Seismic risk and radon set Deschambault-Grondines’ grade, wildfire can drag it down, and flood mapping stays out of it.
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 Deschambault-Grondines has burned: 0.2% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Deschambault-Grondines’ residents live, and the fuel next to their homes.
Around Deschambault-Grondines fire takes 0.001% of the land in a typical year, the typical Canadian town 0.000%, which is low.
The nearer ring around Deschambault-Grondines is less wooded (28% forest fuel) than the land out to 25 km (33%).
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
Deschambault-Grondines sits mid-table in Quebec: 136th of 514 towns, at 0.001% a year, well 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.
The low band takes in 92% of Canada’s 2,610 towns, Deschambault-Grondines among them, though its rate is above zero; 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 Deschambault-Grondines
Flood studies whose area touches Deschambault-Grondines, from NRCan’s inventory, each linked to its owner.
Nationally, Deschambault-Grondines has no listed flood study; the municipality is the place to ask.
Towns with a flood study on file
Flood maps are thinner in Quebec, 45% of towns against 58% nationally, and Deschambault-Grondines has none.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
The grade leaves flood out, since a study area says nothing about how many of Deschambault-Grondines’ homes are at risk.
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 Deschambault-Grondines $0.12 per $1,000 a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
Deschambault-Grondines’ $0.12 is about 3.9 times the typical town’s $0.030: it sits in one of Canada’s more active seismic zones.
Shaking damage a year per $1,000 of building value
Earthquake risk around Deschambault-Grondines ($0.12) matches the middle in Quebec ($0.14), far from 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.
Deschambault-Grondines sits above most of Canada’s 2,611 towns on earthquake risk; 24% 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).
Only shaking damage to buildings in Deschambault-Grondines is counted; landslides, liquefaction, tsunami and fire after a quake aren’t.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Radon about average around Deschambault-Grondines: 8.8% over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Area-wide: radon tests, counted over the Capitale-Nationale health region
Around Deschambault-Grondines, 8.8% of tested homes topped the guideline, near the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Deschambault-Grondines’ area, at 8.8%, is close to the median in Quebec (8.2%); 2.5% of its tests passed 600 Bq/m³.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Radon tops the guideline in a modest share of homes around Deschambault-Grondines, a band holding 37% of Canada’s 2,611 towns; 26% rank 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.
Neighbouring homes in Deschambault-Grondines 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 Deschambault-Grondines
Environment and Climate Change Canada issues the weather alerts for Deschambault-Grondines; 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 Deschambault-Grondines, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Deschambault-Grondines
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Deschambault-Grondines | Low | $0.12 | 8.8% | None listed |
| Saint-Marc-des-Carrières 2,961 · 7.6 km | Low | $0.14 | 8.8% | None listed |
| Portneuf 3,410 · 9.7 km | Low | $0.11 | 8.8% | None listed |
| Saint-Édouard-de-Lotbinière 1,295 · 13 km | Low | $0.15 | 13% | None listed |
| Saint-Casimir 1,506 · 14 km | Low | $0.14 | 8.8% | Yes |
| Cap-Santé 3,885 · 14 km | Low | $0.12 | 8.8% | None listed |
| Saint-Alban 1,264 · 16 km | Low | $0.11 | 8.8% | None listed |
Deschambault-Grondines’ low band tops its neighbours; Saint-Marc-des-Carrières is next (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Deschambault-Grondines faces
Practical steps for Deschambault-Grondines’ 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
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Deschambault-Grondines’ 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 Deschambault-Grondines floods.
- 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 Deschambault-Grondines.
- 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 Deschambault-Grondines sits in.
Questions about flooding and hazards in Deschambault-Grondines
How big is the earthquake risk in Deschambault-Grondines?
About $0.12 a year per $1,000 of building value, NRCan’s long-run expectation for Deschambault-Grondines.
Is Deschambault-Grondines at risk of wildfire?
Not much by Canadian standards: Deschambault-Grondines’ band is low, with 0% of the land within 25 km burned since 1986 (last in 2022), so wildfire doesn’t change its grade.
Is radon a problem in Deschambault-Grondines?
8.8% of the 160 homes Health Canada tested around Deschambault-Grondines topped the guideline; your own house needs its own test.
Does Deschambault-Grondines flood?
No study on Canada’s Flood Map Inventory covers Deschambault-Grondines (0), which doesn’t mean it has never been mapped, so ask the municipality.
How is Deschambault-Grondines’s Hazard risk Grade worked out?
Deschambault-Grondines grades C for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
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).