Glenfield-Jane Heights is on Canada’s flood inventory: 1 listed, led by Toronto Regional Conservation Authority
Since 1986 almost nothing has burned near Glenfield-Jane Heights: 0% of the land within 25 km, or 0.000% a year. Shaking is about as much of a worry in Glenfield-Jane Heights as in most places, at $0.043 a year per $1,000 of building value ($0.030 typical). In Health Canada’s survey, just 2.7% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Hazard risk gives Glenfield-Jane Heights a grade of A−, from earthquakes and radon alone.
What stands out about Glenfield-Jane Heights’s hazards
For Glenfield-Jane Heights, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Glenfield-Jane Heights faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Glenfield-Jane Heights: A−
Seismic risk and radon set Glenfield-Jane Heights’ grade, wildfire can drag it down, and flood mapping stays out of it.
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. The radon share rests on 74 home tests in the survey area, so a few homes move it. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Few fires near Glenfield-Jane Heights: 0% within 5 km, 0% within 25 km
Past fire around Glenfield-Jane Heights’ homes, from the national burned-area record, with the fuel within 5 km.
Next to the typical Canadian town (0.000% a year), Glenfield-Jane Heights’ 0.000% is in the low band.
Land that isn’t forest covers nearly all the ground around Glenfield-Jane Heights: forest fuel is 0.3% within 5 km and 1.8% within 25 km.
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
Of the 871 towns in Ontario, 638 have a burn rate that rounds to zero, Glenfield-Jane Heights among them; Sioux Lookout leads at 0.16% a year.
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.
The low band holds 92% of Canada’s 2,610 towns, and Glenfield-Jane Heights sits at its very bottom; only 7.5% are 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.
Glenfield-Jane Heights is on the flood map inventory: 1 study, by Toronto Regional Conservation Authority
What Canada’s Flood Map Inventory lists for Glenfield-Jane Heights: who studied flooding and where to see their maps.
The flood study touching Glenfield-Jane Heights is Toronto Regional Conservation Authority’s, dated 2021; its own map shows the zones street by street.
| Study | By | Year | Status |
|---|---|---|---|
| Toronto Floodline Consolidation | Toronto Regional Conservation Authority | 2021 | final |
Towns with a flood study on file
Its flood study puts Glenfield-Jane Heights with 69% of towns in Ontario; Canada’s share is 58%.
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 Glenfield-Jane Heights.
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 Glenfield-Jane Heights: $0.043 per $1,000 of buildings a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
With $0.043 of shaking damage a year per $1,000, Glenfield-Jane Heights is about even with the typical $0.030 (1.4 times).
Shaking damage a year per $1,000 of building value
Glenfield-Jane Heights’ $0.043 is close to the median in Ontario, $0.043; Alexandria is highest 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.
Neither high nor low for Canada: 36% of the 2,611 towns expect more damage than Glenfield-Jane Heights.
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).
For Glenfield-Jane Heights the model prices shaking damage to buildings, nothing more.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean). · Data for earthquake risk covers the city of Toronto
Radon runs low around Glenfield-Jane Heights: 2.7% of tested homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Radon tests for the City of Toronto Health Unit
Radon runs below the typical Canadian town (6.6%) in Glenfield-Jane Heights’ area, at 2.7%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Fewer homes top the guideline around Glenfield-Jane Heights (2.7%) than in the typical town in Ontario (4%).
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Under 5% puts Glenfield-Jane Heights 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.
A low area share in Glenfield-Jane Heights doesn’t clear a house, nor does a high one condemn it: test.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Glenfield-Jane Heights
Environment and Climate Change Canada issues the weather alerts for Glenfield-Jane Heights; 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. |
Smoke and fire warnings for Glenfield-Jane Heights come through Environment Canada and Alert Ready; the fire map is CWFIS’s.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Glenfield-Jane Heights’ neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Glenfield-Jane Heights | Low | $0.043 | 2.7% | Yes |
| York University Heights 28,557 · 1.6 km | Low | $0.043 | 2.7% | Yes |
| Black Creek 21,307 · 1.9 km | Low | $0.043 | 2.7% | Yes |
| Oakdale-Beverley Heights 21,386 · 2.5 km | Low | $0.043 | 2.7% | Yes |
| Humbermede 16,959 · 2.7 km | Low | $0.043 | 2.7% | Yes |
| Downsview 18,055 · 3.1 km | Low | $0.043 | 2.7% | Yes |
| Pelmo Park-Humberlea 11,396 · 3.2 km | Low | $0.043 | 2.7% | Yes |
The neighbour with the most fire is York University Heights (low), still no more than Glenfield-Jane Heights (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Glenfield-Jane Heights faces
Practical steps for Glenfield-Jane Heights’ 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
- Flood studies aren’t flood zones. NRCan’s inventory says where flood mapping exists, not where water goes; the map’s owner is the authority for Glenfield-Jane Heights.
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Glenfield-Jane Heights is its health region’s, the survey’s design unit.
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Glenfield-Jane Heights’ census subdivision (a neighbourhood shows its city’s).
- Wildfire counts one way. For Glenfield-Jane Heights, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
Questions about flooding and hazards in Glenfield-Jane Heights
How is Glenfield-Jane Heights’s Hazard risk Grade worked out?
Glenfield-Jane Heights grades A− for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
How big is the earthquake risk in Glenfield-Jane Heights?
In NRCan’s seismic model, Glenfield-Jane Heights’ buildings lose $0.043 per $1,000 of value in an average year.
Is Glenfield-Jane Heights at risk of wildfire?
The burned-area record shows next to nothing around Glenfield-Jane Heights (0% within 25 km since 1986), so its band is low.
Is radon a problem in Glenfield-Jane Heights?
2.7% of the 74 homes Health Canada tested around Glenfield-Jane Heights topped the guideline; your own house needs its own test.
Does Glenfield-Jane Heights flood?
There is flood mapping for Glenfield-Jane Heights on the national inventory, each study linked to its owner’s map, none of them graded.
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).