Photo: Gabriel Picard · CC BY-SA 4.0A flood study covers Saint-Théodore-d'Acton: 1 on the national inventory, the newest from Gouvernement du Québec
Burn scars are few around Saint-Théodore-d'Acton, with 0% of the land within 25 km touched by fire since 1986 (0.000% a year). Earthquakes add more: NRCan’s model puts building losses at $0.099 a year per $1,000 of value, against $0.030 for the typical town. Radon is about average around Saint-Théodore-d'Acton: 8.2% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Saint-Théodore-d'Acton grades C+ for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Saint-Théodore-d'Acton’s hazards
For Saint-Théodore-d'Acton, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Saint-Théodore-d'Acton 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-Théodore-d'Acton: C+
The grade weighs Saint-Théodore-d'Acton’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. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Saint-Théodore-d'Acton has burned: 0.1% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Saint-Théodore-d'Acton’s residents live, and the fuel next to their homes.
The land within 25 km of Saint-Théodore-d'Acton burns at 0.000% a year on average, the low band; the typical Canadian town: 0.000%.
Homes in Saint-Théodore-d'Acton sit on open or built-up ground (4.2% forest fuel within 5 km); the wider 25 km holds 9%.
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
Little or nothing burns around Saint-Théodore-d'Acton in a typical year; 145 of the 514 towns in Quebec share that, and Mistissini leads at 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.
92% of Canada’s 2,610 towns are in the low band and 7.5% above it; Saint-Théodore-d'Acton is among the many where the yearly burn rate rounds to zero.
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.
Saint-Théodore-d'Acton is on the flood map inventory: 1 study, by Gouvernement du Québec
Flood studies whose area touches Saint-Théodore-d'Acton, from NRCan’s inventory, each linked to its owner.
One study on the inventory touches Saint-Théodore-d'Acton, Gouvernement du Québec’s from 2006, and its area can be large, so it says a map exists, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| Acton-Vale | Gouvernement du Québec | 2006 | final |
Towns with a flood study on file
Only 45% of towns in Quebec have a flood study, short of Canada’s 58%; Saint-Théodore-d'Acton is one of them.
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-Théodore-d'Acton’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-Théodore-d'Acton: $0.099 per $1,000 of buildings a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
The typical town loses $0.030 a year to shaking; Saint-Théodore-d'Acton loses $0.099, 3.3 times as much.
Shaking damage a year per $1,000 of building value
The typical town in Quebec expects $0.14 a year in shaking damage; Saint-Théodore-d'Acton expects less, $0.099, and La Pocatière the most, $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 26% of Canada’s 2,611 towns are above Saint-Théodore-d'Acton.
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-Théodore-d'Acton 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 about average around Saint-Théodore-d'Acton: 8.2% over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Saint-Théodore-d'Acton’s area, at 8.2%, is close to the 6.6% of the typical Canadian town. Nobody publishes radon tests for Saint-Théodore-d'Acton alone, so this card uses the figure for the Monteregie health region.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The typical town in Quebec has 8.2% over 200 Bq/m³; Saint-Théodore-d'Acton’s area has 8.2%, much the same.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Saint-Théodore-d'Acton is in the 5–10% band with 37% of Canada’s 2,611 towns; 26% have 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.
Neighbouring homes in Saint-Théodore-d'Acton 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-Théodore-d'Acton
Environment and Climate Change Canada issues the weather alerts for Saint-Théodore-d'Acton; 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-Théodore-d'Acton 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-Théodore-d'Acton
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Saint-Théodore-d'Acton | Low | $0.099 | 8.2% | Yes |
| Acton Vale 7,945 · 6.7 km | Low | $0.093 | 8.2% | Yes |
| Wickham 2,745 · 7.7 km | Low | $0.10 | 0% | None listed |
| Upton 2,149 · 11 km | Low | $0.11 | 8.2% | Yes |
| Saint-Eugène 1,180 · 13 km | Low | $0.12 | 0% | None listed |
| Sainte-Hélène-de-Bagot 1,887 · 14 km | Low | $0.13 | 8.2% | None listed |
| Roxton Falls 1,399 · 15 km | Low | $0.058 | 8.2% | Yes |
None of the places around has more fire nearby than Saint-Théodore-d'Acton (low); Acton Vale comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Saint-Théodore-d'Acton faces
What to do about the hazards Saint-Théodore-d'Acton 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.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- Has it had a radon test?
- Check the address on the flood map.
- Are flood and wildfire insured?
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-Théodore-d'Acton’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-Théodore-d'Acton.
- 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-Théodore-d'Acton.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Saint-Théodore-d'Acton takes its 2007 health region’s share.
Questions about flooding and hazards in Saint-Théodore-d'Acton
How big is the earthquake risk in Saint-Théodore-d'Acton?
Expected earthquake damage in Saint-Théodore-d'Acton comes to $0.099 a year for each $1,000 that buildings are worth.
Is radon a problem in Saint-Théodore-d'Acton?
Around Saint-Théodore-d'Acton, 110 survey homes were tested and 8.2% came in over 200 Bq/m³, a guide to the area, not to any one home.
Does Saint-Théodore-d'Acton flood?
The inventory lists a study touching Saint-Théodore-d'Acton; whether a given street floods is on that map, not in the grade.
Is Saint-Théodore-d'Acton at risk of wildfire?
Fire has reached 0% of the land around Saint-Théodore-d'Acton since 1986 (last in 2025); at low, it neither helps nor hurts the grade.
How is Saint-Théodore-d'Acton’s Hazard risk Grade worked out?
Saint-Théodore-d'Acton’s Hazard risk grade is C+, built on earthquakes and radon with a one-sided wildfire input.
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).