Photo: Umbra Lab, Inc. · CC BY 4.0High radon around St. Clements: 25% of homes tested in the area exceed 200 Bq/m³
Some 2.6% of the land within 25 km of St. Clements has burned since 1986; at 0.08% a year that is moderate, not high. Earthquakes matter little: NRCan’s model puts building losses at $0.005 a year per $1,000 of value, against $0.030 for the typical town. St. Clements grades B for hazard risk, with wildfire counted against it.
What stands out about St. Clements’s hazards
For St. Clements, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What St. Clements faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
St. Clements grades B for hazard risk
The grade weighs St. Clements’ seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
Its place: #141 of 185 in Manitoba and #1,472 of 2,589 Canadian towns.
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.
Some fire around St. Clements: 2.6% of the land within 25 km since 1986, 5.8% within 5 km
Past fire around St. Clements’ homes, from the national burned-area record, with the fuel within 5 km.
Moderate: the land around St. Clements burns at 0.08% a year, where the typical Canadian town sees 0.000%.
About as much forest grows next to St. Clements’ homes (5.7% within 5 km) as across 25 km (11%).
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 189
St. Clements ranks 16th of the 189 towns in Manitoba for burn rate, at 0.08% a year; Flin Flon (Part) leads with 1.68%.
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.
St. Clements is in the moderate band, which holds 5.4% of Canada’s 2,610 towns; 2.1% 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 St. Clements
What Canada’s Flood Map Inventory lists for St. Clements: who studied flooding and where to see their maps.
An empty entry for St. Clements on the inventory isn’t proof of safety; ask locally for flood maps.
Towns with a flood study on file
Only 18% of towns in Manitoba have a flood study, short of Canada’s 58%, and St. Clements is not among 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 St. Clements’ 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.”
Earthquakes cost buildings in St. Clements just $0.005 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
St. Clements’ $0.005 is a fraction of the typical town’s $0.030 (0.2 times as much): quiet ground by Canadian standards.
Shaking damage a year per $1,000 of building value
Neither high nor low in Manitoba: St. Clements’ $0.005 sits by the median of $0.006, while Virden reaches $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.
St. Clements is among Canada’s quietest towns for earthquakes: 96% 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).
Only shaking damage to buildings in St. Clements 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 runs high around St. Clements: 25% of tested homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
More homes than usual test high around St. Clements: 25% against 6.6% for the typical Canadian town.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
More homes top the guideline around St. Clements (25%) than in the typical town in Manitoba (12%).
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
One home in five or more tests over the guideline around St. Clements; 3.1% of Canada’s 2,611 towns are in that band and 1.5% higher.
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.
Whatever St. Clements’ area share, the reading that matters is your own home’s, over a winter.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Radon tests: one figure for all of the Interlake health region
Where to get warnings in St. Clements
Environment and Climate Change Canada issues the weather alerts for St. Clements; 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 St. Clements, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How St. Clements’ neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| St. Clements | Moderate | $0.005 | 25% | None listed |
| Selkirk 11,570 · 3.7 km | Moderate | $0.005 | 25% | None listed |
| St. Andrews 12,021 · 10 km | Moderate | $0.005 | 25% | None listed |
| Brokenhead 5,931 · 16 km | Moderate | $0.005 | 21% | None listed |
The fire record around Brokenhead is a touch heavier than St. Clements’, but the band is the same: moderate (here moderate).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what St. Clements faces
What to do about the hazards St. Clements faces, and what to ask before you buy.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- 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.
- Has it had a radon test?
- Ask the municipality for flood maps.
- How close is the forest edge?
- Are flood and wildfire insured?
What this data can and can’t tell you
- 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 St. Clements floods.
- Wildfire counts one way. For St. Clements, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for St. Clements’ census subdivision (a neighbourhood shows its city’s).
- 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 St. Clements sits in.
Questions about flooding and hazards in St. Clements
Is radon a problem in St. Clements?
In Health Canada’s survey, 25% of 121 homes tested in St. Clements’ area were above 200 Bq/m³, though only a test tells you about one house.
How big is the earthquake risk in St. Clements?
In NRCan’s seismic model, St. Clements’ buildings lose $0.005 per $1,000 of value in an average year.
Is St. Clements at risk of wildfire?
Less than most of Canada: 2.6% of the land within 25 km of St. Clements has burned since 1986, the last in 2025, a moderate band that leaves Risk alone.
Does St. Clements flood?
Nothing is listed for St. Clements on the national inventory (0); local maps may still exist with the municipality.
How is St. Clements’s Hazard risk Grade worked out?
Hazard risk gives St. Clements B, weighing earthquakes and radon and counting wildfire only against it.
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).