Photo: Greg Schechter from San Francisco, USA · CC BY 2.0Around Norfolk-Treherne, 35% of tested homes have radon above the guideline
The national fire record shows next to nothing around Norfolk-Treherne, 0% of the land within 25 km since 1986 (0.000% a year). Earthquakes matter little: NRCan’s model puts building losses at $0.004 a year per $1,000 of value, against $0.030 for the typical town. Norfolk-Treherne grades B for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Norfolk-Treherne’s hazards
Four national sources, each read for Norfolk-Treherne: earthquakes, radon, past fires and flood studies.
What Norfolk-Treherne faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Norfolk-Treherne: B
Seismic risk and radon set Norfolk-Treherne’s grade, wildfire can drag it down, and flood mapping stays out of it.
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 Norfolk-Treherne: 0% of the land within 25 km burned since 1986, 0% within 5 km
Past fire around Norfolk-Treherne’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 Norfolk-Treherne, 0.000% for the typical Canadian town.
The closest burn since 1986 lies 22 km from Norfolk-Treherne’s homes, none within 5 km.
Land that isn’t forest covers nearly all the ground around Norfolk-Treherne: forest fuel is 0% within 5 km and 0% 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 Manitoba · highest of 190
Among the 190 towns in Manitoba, Flin Flon (Part) burns fastest (1.68% a year); Norfolk-Treherne is with the 61 near 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.
The low band holds 92% of Canada’s 2,610 towns, and Norfolk-Treherne sits at its very bottom; only 7.5% are above it.
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 Norfolk-Treherne
What Canada’s Flood Map Inventory lists for Norfolk-Treherne: who studied flooding and where to see their maps.
An empty entry for Norfolk-Treherne on the inventory isn’t proof of safety; ask locally for flood maps.
Towns with a flood study on file
No study touches Norfolk-Treherne; in Manitoba, 18% 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 studies don’t enter the grade; they are listed so you can open the official map for Norfolk-Treherne.
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 Norfolk-Treherne just $0.004 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Shaking costs the typical town $0.030 a year; in Norfolk-Treherne it is only $0.004, 0.1 times as much.
Shaking damage a year per $1,000 of building value
The typical town in Manitoba expects $0.006 a year in shaking damage; Norfolk-Treherne expects less, $0.004, and Virden the most, $0.007.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Norfolk-Treherne is among Canada’s quietest towns for earthquakes: 98% of the 2,611 expect more damage.
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 Norfolk-Treherne’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).
Test for radon in Norfolk-Treherne: 35% of area homes were over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Radon tests for the Assiniboine health region
At 35% over the guideline, the area around Norfolk-Treherne beats the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Norfolk-Treherne’s area, at 35%, is above the median in Manitoba (12%), and 1.8% 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.
No band is higher: Norfolk-Treherne is among the 1.5% of Canada’s towns with 30% or more of tests over 200 Bq/m³.
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 Norfolk-Treherne; it can’t tell you your basement’s level.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Norfolk-Treherne
Alerts for Norfolk-Treherne 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 Norfolk-Treherne 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)
Get ready for what Norfolk-Treherne faces
Practical steps for Norfolk-Treherne’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
- Flood studies aren’t flood zones. NRCan’s inventory says where flood mapping exists, not where water goes; the map’s owner is the authority for Norfolk-Treherne.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Norfolk-Treherne’s figure is its subdivision’s.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Norfolk-Treherne’s homes since 1986, a history of fire that may lower Risk but never raises it.
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Norfolk-Treherne is its health region’s, the survey’s design unit.
Questions about flooding and hazards in Norfolk-Treherne
How big is the earthquake risk in Norfolk-Treherne?
NRCan’s model expects shaking to cost buildings in Norfolk-Treherne $0.004 a year for every $1,000 of their value, on average over many years.
Is radon a problem in Norfolk-Treherne?
The area’s survey found 35% of 110 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Norfolk-Treherne.
Is Norfolk-Treherne at risk of wildfire?
Some, but Norfolk-Treherne’s low band (0% of nearby land burned since 1986, latest 2003) is short of the level that counts.
Does Norfolk-Treherne flood?
The inventory has 0 studies for Norfolk-Treherne, and an empty list isn’t a clean bill: the municipality holds any flood maps.
How is Norfolk-Treherne’s Hazard risk Grade worked out?
Norfolk-Treherne grades B 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).