Photo: BrackishStowaway · CC0A flood study covers Beechborough-Greenbrook: 2 on the national inventory, the newest from Toronto Regional Conservation Authority
Since 1986 almost nothing has burned near Beechborough-Greenbrook: 0% of the land within 25 km, or 0.000% a year. Earthquake risk in Beechborough-Greenbrook is ordinary: NRCan’s model puts building losses at $0.043 a year per $1,000 of value, close to the typical town’s $0.030. Fewer homes than usual carry radon here, 2.7% over the guideline where the typical town has 6.6%. Beechborough-Greenbrook grades A− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Beechborough-Greenbrook’s hazards
Four national sources, each read for Beechborough-Greenbrook: earthquakes, radon, past fires and flood studies.
What Beechborough-Greenbrook faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Beechborough-Greenbrook: A−
The grade weighs Beechborough-Greenbrook’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: 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.
Wildfire is rare near Beechborough-Greenbrook: 0% of the land within 25 km burned since 1986, 0% within 5 km
Fires mapped since 1986 around where Beechborough-Greenbrook’s residents live, and the fuel next to their homes.
With 0.000% burned a year, Beechborough-Greenbrook is among the many low-band places (the typical Canadian town 0.000%).
Around Beechborough-Greenbrook the forest is thin or far off: 0.3% of the land within 5 km and 0.9% within 25 km is forest fuel.
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, Beechborough-Greenbrook 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.
Most of the country’s 2,610 towns are low-band (92%, against 7.5% above); around Beechborough-Greenbrook, 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 Beechborough-Greenbrook is mapped in 2 studies, the newest by Toronto Regional Conservation Authority
Flood studies whose area touches Beechborough-Greenbrook, from NRCan’s inventory, each linked to its owner.
Toronto Regional Conservation Authority and others have studied flooding in areas that include Beechborough-Greenbrook: 2 studies, the latest from 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
Flood maps are common in Ontario: 69% of towns have one, against 58% nationally, and Beechborough-Greenbrook is among them.
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 Beechborough-Greenbrook’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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
Ordinary seismic risk in Beechborough-Greenbrook: $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.
Earthquake losses in Beechborough-Greenbrook, $0.043 per $1,000, are in line with the typical $0.030 (1.4 times).
Behind earthquake risk sits data gathered across the city of Toronto, with Beechborough-Greenbrook one part of it.
Shaking damage a year per $1,000 of building value
The median in Ontario is $0.043; Beechborough-Greenbrook, 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.
Beechborough-Greenbrook sits mid-range among Canada’s 2,611 towns: 36% expect more shaking damage.
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 Beechborough-Greenbrook’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 Beechborough-Greenbrook are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Area-wide: radon tests, counted over the City of Toronto Health Unit
Beechborough-Greenbrook’s survey area reads 2.7% over the guideline, under the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Against the typical town in Ontario (4%), the area around Beechborough-Greenbrook 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.
Beechborough-Greenbrook 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.
A survey sample isn’t a map: any home in Beechborough-Greenbrook can be high, and a three-month test is the only way to know.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Beechborough-Greenbrook
Environment and Climate Change Canada issues the weather alerts for Beechborough-Greenbrook; 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 Beechborough-Greenbrook, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Beechborough-Greenbrook
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Beechborough-Greenbrook | Low | $0.043 | 2.7% | Yes |
| Keelesdale-Eglinton West 11,407 · 1.1 km | Low | $0.043 | 2.7% | Yes |
| Brookhaven-Amesbury 17,541 · 1.7 km | Low | $0.043 | 2.7% | Yes |
| Caledonia-Fairbank 10,037 · 1.7 km | Low | $0.043 | 2.7% | None listed |
| Mount Dennis 13,364 · 2.1 km | Low | $0.043 | 2.7% | Yes |
| Briar Hill-Belgravia 14,590 · 2.1 km | Low | $0.043 | 2.7% | None listed |
| Yorkdale-Glen Park 17,043 · 2.3 km | Low | $0.043 | 2.7% | None listed |
Nowhere around Beechborough-Greenbrook burns more: Keelesdale-Eglinton West, 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 Beechborough-Greenbrook faces
What to do about the hazards Beechborough-Greenbrook 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?
- 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 Beechborough-Greenbrook until then.
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Beechborough-Greenbrook without grading them.
- 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 Beechborough-Greenbrook’s.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Beechborough-Greenbrook’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
Questions about flooding and hazards in Beechborough-Greenbrook
Is Beechborough-Greenbrook at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Beechborough-Greenbrook since 1986, a low band, though small grass fires aren’t mapped.
How big is the earthquake risk in Beechborough-Greenbrook?
Expected earthquake damage in Beechborough-Greenbrook comes to $0.043 a year for each $1,000 that buildings are worth.
Does Beechborough-Greenbrook flood?
A flood study covers Beechborough-Greenbrook 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 Beechborough-Greenbrook?
Around Beechborough-Greenbrook, 74 survey homes were tested and 2.7% came in over 200 Bq/m³, a guide to the area, not to any one home.
How is Beechborough-Greenbrook’s Hazard risk Grade worked out?
Beechborough-Greenbrook’s Hazard risk grade is A−, built on earthquakes and radon with a one-sided wildfire input.
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).