Photo: Pierre Bona · CC BY-SA 3.0Flood mapping exists for Noyan: 1 on record, latest by Gouvernement du Québec
No wildfire is mapped within 25 km of Noyan’s homes since 1986 (0% of the land, 0.000% a year). Seismic risk runs high: $0.17 of expected damage per $1,000 of buildings a year, the typical town $0.030. Noyan’s survey area, 8.2% over the radon guideline, is close to the typical town’s 6.6%. Hazard risk gives Noyan a grade of C, from earthquakes and radon alone.
What stands out about Noyan’s hazards
Four national sources, each read for Noyan: earthquakes, radon, past fires and flood studies.
What Noyan faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Noyan: C
Seismic risk and radon set Noyan’s 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. Small fires and grass fires are largely missing from the national burned-area record.
Wildfire is rare near Noyan: 0% of the land within 25 km burned since 1986, 0% within 5 km
Fires mapped since 1986 around where Noyan’s residents live, and the fuel next to their homes.
A burn rate of 0.000% a year keeps Noyan in the low band (the typical Canadian town: 0.000%).
5% of the land within 25 km of Noyan is forest fuel, yet only 0.3% within 5 km of its homes.
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
Near-zero burning puts Noyan with 145 of the 514 towns in Quebec, far below Mistissini 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; Noyan 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.
Gouvernement du Québec has mapped flooding for Noyan (1 study)
Flood studies whose area touches Noyan, from NRCan’s inventory, each linked to its owner.
Gouvernement du Québec studied flooding in an area that includes Noyan (2004); open its map to see which streets lie in a flood zone.
| Study | By | Year | Status |
|---|---|---|---|
| Brome-Missisquoi-Haut-Richelieu-Vallée-du-Richelieu-Rouville | Gouvernement du Québec | 2004 | final |
Towns with a flood study on file
Only 45% of towns in Quebec have a flood study, short of Canada’s 58%; Noyan is one of them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Listed, not scored: a flood study proves a map exists, not that Noyan floods.
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 Noyan: $0.17 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.
Noyan’s $0.17 is about 5.5 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
Noyan’s $0.17 is close to the median in Quebec, $0.14; La Pocatière is highest 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.
More earthquake risk than most: only 14% of Canada’s 2,611 towns are above Noyan.
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).
The loss is to Noyan’s buildings alone, from ground shaking; infrastructure and secondary hazards are left out.
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 Noyan: 8.2% over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Around Noyan, 8.2% of tested homes topped the guideline, near the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The typical town in Quebec has 8.2% over 200 Bq/m³; Noyan’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.
Radon tops the guideline in a modest share of homes around Noyan, 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.
The survey sampled homes around Noyan; it can’t tell you your basement’s level.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Radon tests: the Monteregie health region
Weather and fire alerts for Noyan
Alerts for Noyan 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. |
Evacuation orders for Noyan come from the municipality or the province, while CWFIS maps fire danger every day.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Noyan’s neighbours compare on hazards
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Noyan | Low | $0.17 | 8.2% | Yes |
| Lacolle 2,806 · 5.9 km | Low | $0.17 | 8.2% | Yes |
| Saint-Paul-de-l'Île-aux-Noix 2,321 · 6.2 km | Low | $0.18 | 8.2% | Yes |
| Saint-Georges-de-Clarenceville 1,274 · 10 km | Low | $0.17 | 8.2% | Yes |
| Venise-en-Québec 2,252 · 13 km | Low | $0.15 | 8.2% | Yes |
| Saint-Bernard-de-Lacolle 1,655 · 14 km | Low | $0.17 | 8.2% | None listed |
| Henryville 1,664 · 15 km | Low | $0.17 | 8.2% | Yes |
None of the places around has more fire nearby than Noyan (low); Lacolle comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Noyan faces
Practical steps for Noyan’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.
- 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
- 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 Noyan sits in.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Noyan’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
- Earthquakes are modelled. Shaking damage is modelled from the ground, the buildings and the odds of each quake, and published for whole subdivisions such as Noyan’s.
- 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 Noyan floods.
Questions about flooding and hazards in Noyan
Does Noyan flood?
Noyan’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
Is Noyan at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Noyan since 1986, a low band, though small grass fires aren’t mapped.
Is radon a problem in Noyan?
8.2% of the 110 homes Health Canada tested around Noyan topped the guideline; your own house needs its own test.
How is Noyan’s Hazard risk Grade worked out?
Noyan’s Hazard risk grade is C, built on earthquakes and radon with a one-sided wildfire input.
How big is the earthquake risk in Noyan?
Expected earthquake damage in Noyan comes to $0.17 a year for each $1,000 that buildings are worth.
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).