A flood study covers Rosedale: 1 on the national inventory, the newest from Hamilton Conservation Authority
The national fire record shows next to nothing around Rosedale, 0% of the land within 25 km since 1986 (0.000% a year). Shaking is about as much of a worry in Rosedale as in most places, at $0.044 a year per $1,000 of building value ($0.030 typical). About as many homes carry radon around Rosedale as elsewhere, 5% over the guideline where the typical town has 6.6%. Hazard risk gives Rosedale a grade of B+, from earthquakes and radon alone.
What stands out about Rosedale’s hazards
Four national sources, each read for Rosedale: earthquakes, radon, past fires and flood studies.
What Rosedale faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Rosedale grades B+ for hazard risk
Earthquake risk and radon make Rosedale’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
Its place: #494 of 866 in Ontario and #1,255 of 2,589 Canadian towns.
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.
Few fires near Rosedale: 0% within 5 km, 0% within 25 km
Past fire around Rosedale’s homes, from the national burned-area record, with the fuel within 5 km.
Rosedale burns at 0.000% a year, low against 0.000% for the typical Canadian town.
Only 0.8% of the land within 25 km of Rosedale is forest fuel, and 0.2% 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 Ontario · highest of 871
Sioux Lookout has the highest burn rate in Ontario, 0.16% a year; around Rosedale, as around 638 of the 871 towns, it rounds to 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.
92% of Canada’s 2,610 towns are in the low band and 7.5% above it; Rosedale 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.
Hamilton Conservation Authority has mapped flooding for Rosedale (1 study)
What Canada’s Flood Map Inventory lists for Rosedale: who studied flooding and where to see their maps.
Hamilton Conservation Authority holds the flood mapping that covers Rosedale (2025), linked below.
| Study | By | Year | Status |
|---|---|---|---|
| Red Hill Creek | Hamilton Conservation Authority | 2025 | final |
Towns with a flood study on file
69% of towns in Ontario have a flood study, more than Canada’s 58%; Rosedale has one too.
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 Rosedale 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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
Earthquakes cost buildings in Rosedale $0.044 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
With $0.044 of shaking damage a year per $1,000, Rosedale is about even with the typical $0.030 (1.5 times).
Shaking damage a year per $1,000 of building value
Neither high nor low in Ontario: Rosedale’s $0.044 sits by the median of $0.043, while Alexandria reaches $0.21.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
32% of Canada’s 2,611 towns expect more shaking damage than Rosedale, which places it in the upper third.
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).
Roads, pipes and bridges aren’t in Rosedale’s figure, nor landslides or tsunami: it is buildings and shaking.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean). · Earthquake risk: one figure for all of the city of Hamilton
Radon about average around Rosedale: 5% over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Measured across the City of Hamilton Health Unit: radon tests
Around Rosedale, 5% of tested homes topped the guideline, near the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs higher around Rosedale than in most towns in Ontario: 5% against 4%.
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 Rosedale’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.
One home in Rosedale can be high while next door is low; a three-month test settles it.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Rosedale
Alerts for Rosedale 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 Rosedale 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)
Hazards in the places around Rosedale
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Rosedale | Low | $0.044 | 5% | Yes |
| Bartonville 4,311 · 1.0 km | Low | $0.044 | 5% | Yes |
| Glenview West 3,431 · 1.2 km | Low | $0.044 | 5% | Yes |
| Sherwood 2,567 · 1.3 km | Low | $0.044 | 5% | Yes |
| Red Hill 4,540 · 1.4 km | Low | $0.044 | 5% | Yes |
| Huntington 5,024 · 1.5 km | Low | $0.044 | 5% | Yes |
| Delta East 6,186 · 1.5 km | Low | $0.044 | 5% | None listed |
Fire is no heavier anywhere nearby than around Rosedale (low), with Bartonville next at low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Rosedale faces
Practical steps for Rosedale’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?
- Check the address on the flood map.
- Are flood and wildfire insured?
What this data can and can’t tell you
- 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 Rosedale until then.
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Rosedale without grading them.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Rosedale’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 Rosedale’s.
Questions about flooding and hazards in Rosedale
Is Rosedale at risk of wildfire?
Very little by the national record: Rosedale’s band is low, with 0% of the land within 25 km burned since 1986, so wildfire doesn’t change its grade.
How is Rosedale’s Hazard risk Grade worked out?
Hazard risk gives Rosedale B+, weighing earthquakes and radon and counting wildfire only against it.
Does Rosedale flood?
A flood study covers Rosedale on Canada’s Flood Map Inventory; open the owner’s map to check a street, since flood isn’t graded.
Is radon a problem in Rosedale?
The area’s survey found 5% of 100 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Rosedale.
How big is the earthquake risk in Rosedale?
In NRCan’s seismic model, Rosedale’s buildings lose $0.044 per $1,000 of value in an average year.
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).