Photo: Canadian2006 · CC BY-SA 3.0Rosthern No. 403 faces fewer hazards than 96% of Canadian towns
Little of the land around Rosthern No. 403 has burned: 0.2% within 25 km since 1986, or 0.006% a year. Seismic risk runs low: $0.005 of expected damage per $1,000 of buildings a year, the typical town $0.030. About as many homes carry radon around Rosthern No. 403 as elsewhere, 6.6% over the guideline where the typical town has 6.6%. Rosthern No. 403 grades A+ for hazard risk, with wildfire counted against it.
What stands out about Rosthern No. 403’s hazards
For Rosthern No. 403, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Rosthern No. 403 faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Rosthern No. 403: A+
For Rosthern No. 403, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #2 of 104 in Saskatchewan and #243 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Only 76 homes were tested in the survey area, so the radon share is rough. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Rosthern No. 403 has burned: 0% within 5 km, 0.2% within 25 km since 1986
Past fire around Rosthern No. 403’s homes, from the national burned-area record, with the fuel within 5 km.
At 0.006% of the land a year, Rosthern No. 403’s burn rate is in the low band; the typical Canadian town sees 0.000%.
The closest burn since 1986 lies 21 km from Rosthern No. 403’s homes, none within 5 km.
Only 0% of the land within 25 km of Rosthern No. 403 is forest fuel, and 0% close in.
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 Saskatchewan · highest of 104
At 0.006% a year, Rosthern No. 403 ranks 40th of the 104 towns in Saskatchewan; La Loche leads at 1.94%.
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.
Low, like 92% of the country’s 2,610 towns: the land around Rosthern No. 403 burns, but slower than in the 7.5% 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.
The flood map inventory lists nothing for Rosthern No. 403
What Canada’s Flood Map Inventory lists for Rosthern No. 403: who studied flooding and where to see their maps.
No flood study on the national inventory covers Rosthern No. 403; ask the municipality, which is the authority for its flood maps.
Towns with a flood study on file
Flood maps are thinner in Saskatchewan, 55% of towns against 58% nationally, and Rosthern No. 403 has none.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood mapping is shown for Rosthern No. 403 to be opened and checked, never turned into a grade.
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.”
Little shaking expected in Rosthern No. 403: $0.005 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
At $0.005 per $1,000, Rosthern No. 403 carries 0.2 times the typical Canadian town’s earthquake risk ($0.030): low.
Shaking damage a year per $1,000 of building value
About level with the typical town in Saskatchewan: Rosthern No. 403’s $0.005 against $0.006; Weyburn reaches $0.033.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Nearly every one of Canada’s 2,611 towns (96%) expects more shaking damage than Rosthern No. 403.
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).
What a quake does after the shaking, fire, landslides, tsunami, falls outside NRCan’s figure for Rosthern No. 403.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Some radon around Rosthern No. 403: 6.6% of area homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Measured across the Saskatoon RHA: radon tests
At 6.6% over the guideline, the area around Rosthern No. 403 is about level with the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The median in Saskatchewan is 9.1% over 200 Bq/m³; around Rosthern No. 403 it is 6.6%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
37% of Canada’s 2,611 towns share Rosthern No. 403’s band of 5 to 10%; 26% sit 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.
Radon varies from house to house in Rosthern No. 403, so the survey is a reason to test, not a result for yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Rosthern No. 403
Alerts for Rosthern No. 403 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. |
Alert Ready carries evacuation orders for Rosthern No. 403 to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Rosthern No. 403
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Rosthern No. 403 | Low | $0.005 | 6.6% | None listed |
| Osler 1,473 · 14 km | Low | $0.005 | 6.6% | None listed |
| Laird No. 404 1,488 · 17 km | Low | $0.005 | 6.6% | None listed |
| Waldheim 1,447 · 17 km | Low | $0.006 | 6.6% | None listed |
Rosthern No. 403’s low band tops its neighbours; Osler is next (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Rosthern No. 403 faces
Practical steps for Rosthern No. 403’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. Flood studies cover areas of every size, which is why the page lists them for Rosthern No. 403 without grading them.
- Radon is a survey. Radon figures pool the survey’s home tests by area: postal areas once their boundaries arrive, the 2007 health region around Rosthern No. 403 until then.
- 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 Rosthern No. 403.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Rosthern No. 403’s included.
Questions about flooding and hazards in Rosthern No. 403
Does Rosthern No. 403 flood?
No study on Canada’s Flood Map Inventory covers Rosthern No. 403 (0), which doesn’t mean it has never been mapped, so ask the municipality.
Is radon a problem in Rosthern No. 403?
6.6% of the 76 homes Health Canada tested around Rosthern No. 403 topped the guideline; your own house needs its own test.
How big is the earthquake risk in Rosthern No. 403?
NRCan’s model expects shaking to cost buildings in Rosthern No. 403 $0.005 a year for every $1,000 of their value, on average over many years.
Is Rosthern No. 403 at risk of wildfire?
Not much by Canadian standards: Rosthern No. 403’s band is low, with 0.2% of the land within 25 km burned since 1986 (last in 2025), so wildfire doesn’t change its grade.
How is Rosthern No. 403’s Hazard risk Grade worked out?
Hazard risk gives Rosthern No. 403 A+, 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).