A flood study covers Maple Leaf: 2 on the national inventory, the newest from Toronto Regional Conservation Authority
For Maple Leaf, wildfire history is close to nil: 0% of nearby land since 1986, 0.000% a year. Shaking is about as much of a worry in Maple Leaf as in most places, at $0.043 a year per $1,000 of building value ($0.030 typical). Radon is lower than usual: 2.7% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Maple Leaf grades A− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Maple Leaf’s hazards
Four national sources, each read for Maple Leaf: earthquakes, radon, past fires and flood studies.
What Maple Leaf faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Maple Leaf: A−
Earthquake risk and radon make Maple Leaf’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
Its place: #285 of 866 in Ontario and #700 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Only 74 homes were tested in the survey area, so the radon share is rough. Small fires and grass fires are largely missing from the national burned-area record.
Few fires near Maple Leaf: 0% within 5 km, 0% within 25 km
Fires mapped since 1986 around where Maple Leaf’s residents live, and the fuel next to their homes.
Low: the land around Maple Leaf burns at 0.000% a year, where the typical Canadian town sees 0.000%.
Only 1.2% of the land within 25 km of Maple Leaf is forest fuel, and 0.3% 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
Among the 871 towns in Ontario, Sioux Lookout burns fastest (0.16% a year); Maple Leaf is with the 638 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.
Most of the country’s 2,610 towns are low-band (92%, against 7.5% above); around Maple Leaf, burning 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.
Flooding around Maple Leaf is mapped in 2 studies, the newest by Toronto Regional Conservation Authority
Flood studies whose area touches Maple Leaf, from NRCan’s inventory, each linked to its owner.
For Maple Leaf the inventory points to 2 studies, most recently Toronto Regional Conservation Authority’s in 2021.
| Study | By | Year | Status |
|---|---|---|---|
| Toronto Floodline Consolidation | Toronto Regional Conservation Authority | 2021 | final |
| Rockcliffe Special Policy Area | Toronto and Region Conservation Authority | 2020 | final |
Towns with a flood study on file
Mapping in Ontario reaches 69% of towns, Maple Leaf included, beside 58% across Canada.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Nothing here counts toward Risk; the studies are pointers to the maps their owners keep for Maple Leaf.
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.
Ordinary seismic risk in Maple Leaf: $0.043 per $1,000 of buildings a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
Maple Leaf’s $0.043 is close to the typical town’s $0.030 (1.4 times as much).
Maple Leaf doesn’t get its own earthquake risk figures; the ones here come from the city of Toronto.
Shaking damage a year per $1,000 of building value
The median in Ontario is $0.043; Maple Leaf, at $0.043, is right beside it, and Alexandria tops the list at $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 Maple Leaf.
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 Maple Leaf’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).
2.7% of homes tested around Maple Leaf are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Maple Leaf’s survey area reads 2.7% over the guideline, under the typical Canadian town’s 6.6%. Behind radon tests sits data gathered across the City of Toronto Health Unit, with Maple Leaf one part of it.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Against the typical town in Ontario (4%), the area around Maple Leaf has fewer high tests: 2.7%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Under 5% puts Maple Leaf with 37% of Canada’s 2,611 towns; 63% have more high tests.
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 Maple Leaf 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 Maple Leaf
Environment and Climate Change Canada issues the weather alerts for Maple Leaf; 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 Maple Leaf, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Maple Leaf
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Maple Leaf | Low | $0.043 | 2.7% | Yes |
| Downsview 18,055 · 1.7 km | Low | $0.043 | 2.7% | Yes |
| Rustic 9,543 · 1.8 km | Low | $0.043 | 2.7% | Yes |
| Yorkdale-Glen Park 17,043 · 1.9 km | Low | $0.043 | 2.7% | None listed |
| Brookhaven-Amesbury 17,541 · 2.0 km | Low | $0.043 | 2.7% | Yes |
| Oakdale-Beverley Heights 21,386 · 2.4 km | Low | $0.043 | 2.7% | Yes |
| Beechborough-Greenbrook 6,419 · 2.5 km | Low | $0.043 | 2.7% | Yes |
Downsview (low) has the heaviest fire record of Maple Leaf’s neighbours, and Maple Leaf (low) matches or beats it.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Maple Leaf faces
Practical steps for Maple Leaf’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
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Maple Leaf’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
- 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 Maple Leaf floods.
- 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 Maple Leaf sits in.
- 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 Maple Leaf’s.
Questions about flooding and hazards in Maple Leaf
How is Maple Leaf’s Hazard risk Grade worked out?
Maple Leaf’s Hazard risk grade is A−, built on earthquakes and radon with a one-sided wildfire input.
How big is the earthquake risk in Maple Leaf?
Expected earthquake damage in Maple Leaf comes to $0.043 a year for each $1,000 that buildings are worth.
Is radon a problem in Maple Leaf?
2.7% of the 74 homes Health Canada tested around Maple Leaf topped the guideline; your own house needs its own test.
Is Maple Leaf at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Maple Leaf since 1986, a low band, though small grass fires aren’t mapped.
Does Maple Leaf flood?
Maple Leaf’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
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).