Photo: Ken Lund from Reno, Nevada, USA · CC BY-SA 2.0A quiet place for hazards: low wildfire, little earthquake risk, and 2.7% of tested homes over the radon guideline in Casa Loma’s area
Since 1986 almost nothing has burned near Casa Loma: 0% of the land within 25 km, or 0.000% a year. Seismic risk in Casa Loma sits near the middle: $0.043 of expected damage per $1,000 of buildings a year, the typical town $0.030. Casa Loma grades A− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Casa Loma’s hazards
For Casa Loma, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Casa Loma faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Casa Loma: A−
The grade weighs Casa Loma’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
Its place: #285 of 866 in Ontario and #700 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Only 74 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.
Few fires near Casa Loma: 0% within 5 km, 0% within 25 km
Fires mapped since 1986 around where Casa Loma’s residents live, and the fuel next to their homes.
A burn rate of 0.000% a year keeps Casa Loma in the low band (the typical Canadian town: 0.000%).
Only 1% of the land within 25 km of Casa Loma is forest fuel, and 0.1% 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 Casa Loma, 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.
Only 7.5% of Canada’s 2,610 towns are above the low band, which holds 92%; Casa Loma, at a rounded zero, is far from them.
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 Casa Loma
Flood studies whose area touches Casa Loma, from NRCan’s inventory, each linked to its owner.
Canada’s Flood Map Inventory lists no study whose area touches Casa Loma, which doesn’t mean it has never been mapped.
Towns with a flood study on file
Mapping in Ontario reaches 69% of towns, beside 58% across Canada, but not Casa Loma.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
The grade leaves flood out, since a study area says nothing about how many of Casa Loma’s homes are at risk.
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 Casa Loma $0.043 per $1,000 a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
1.4 times the typical $0.030: Casa Loma’s $0.043 is ordinary.
Nobody publishes earthquake risk for Casa Loma alone, so this card uses the figure for the city of Toronto.
Shaking damage a year per $1,000 of building value
Shaking damage around Casa Loma runs at $0.043 a year, near the $0.043 of the typical town in Ontario; Alexandria has $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.
Middle of the pack: 36% of Canada’s 2,611 towns have more earthquake risk than Casa Loma.
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 Casa Loma.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Little radon around Casa Loma: 2.7% of area homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Source area for radon tests: the City of Toronto Health Unit
Where the typical Canadian town has 6.6% of homes over the guideline, Casa Loma’s area has fewer, 2.7%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Casa Loma’s area, at 2.7%, is below the median in Ontario (4%).
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Casa Loma is in the lowest band, with 37% of Canada’s 2,611 towns: under 5% of tests over the guideline, while 63% have more.
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 Casa Loma’s 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).
Where to get warnings in Casa Loma
Environment and Climate Change Canada issues the weather alerts for Casa Loma; 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. |
For fires near Casa Loma, the national fire information system maps danger and active fires daily; local authorities give any evacuation order.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Casa Loma
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Casa Loma | Low | $0.043 | 2.7% | None listed |
| Yonge-St.Clair 13,177 · 0.9 km | Low | $0.043 | 2.7% | None listed |
| Annex 30,705 · 1.4 km | Low | $0.043 | 2.7% | Yes |
| Forest Hill South 11,059 · 1.4 km | Low | $0.043 | 2.7% | None listed |
| Humewood-Cedarvale 13,978 · 1.6 km | Low | $0.043 | 2.7% | None listed |
| Wychwood 13,828 · 1.8 km | Low | $0.043 | 2.7% | None listed |
| Rosedale-Moore Park 20,268 · 2.1 km | Low | $0.043 | 2.7% | Yes |
Nowhere around Casa Loma burns more: Yonge-St.Clair, the closest rival, is low to its low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Casa Loma faces
What to do about the hazards Casa Loma faces, and what to ask before you buy.
- 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
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Casa Loma takes its 2007 health region’s share.
- Flood studies aren’t flood zones. The flood inventory points to maps; it is incomplete and not the official source, so ask the municipality about any street in Casa Loma.
- 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 Casa Loma.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Casa Loma’s included.
Questions about flooding and hazards in Casa Loma
How is Casa Loma’s Hazard risk Grade worked out?
Casa Loma grades A− for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
Does Casa Loma flood?
Nothing is listed for Casa Loma on the national inventory (0); local maps may still exist with the municipality.
How big is the earthquake risk in Casa Loma?
About $0.043 a year per $1,000 of building value, NRCan’s long-run expectation for Casa Loma.
Is Casa Loma at risk of wildfire?
No meaningful wildfire history near Casa Loma: 0% of nearby land since 1986, band low.
Is radon a problem in Casa Loma?
In Health Canada’s survey, 2.7% of 74 homes tested in Casa Loma’s area were above 200 Bq/m³, though only a test tells you about one house.
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).