Photo: Geo Swan from Toronto, Canada · CC0Flood mapping exists for Bay-Cloverhill: 1 on record, latest by Toronto Regional Conservation Authority
Wildfire isn’t Bay-Cloverhill’s worry: 0% of the land within 25 km burned since 1986 (0.000% a year). Earthquake risk in Bay-Cloverhill 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. In Health Canada’s survey, just 2.7% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Hazard risk gives Bay-Cloverhill a grade of A−, from earthquakes and radon alone.
What stands out about Bay-Cloverhill’s hazards
For Bay-Cloverhill, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Bay-Cloverhill faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Bay-Cloverhill grades A− for hazard risk
Risk averages earthquakes and radon; wildfire joins only where it pulls the average down, so a town like Bay-Cloverhill with little fire nearby would get no credit for it.
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.
Wildfire is rare near Bay-Cloverhill: 0% of the land within 25 km burned since 1986, 0% within 5 km
Past fire around Bay-Cloverhill’s homes, from the national burned-area record, with the fuel within 5 km.
Around Bay-Cloverhill fire takes 0.000% of the land in a typical year, the typical Canadian town 0.000%, which is low.
With 0.4% forest fuel within 5 km and 0.7% within 25 km, the land around Bay-Cloverhill gives a fire little to burn.
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
To three decimals the burn rate around Bay-Cloverhill is zero, as for 638 of the 871 towns in Ontario, while Sioux Lookout reaches 0.16%.
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.
Bay-Cloverhill shares the low band with 92% of Canada’s 2,610 towns, its burn rate rounding to nothing; 7.5% burn faster.
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.
Toronto Regional Conservation Authority has mapped flooding for Bay-Cloverhill (1 study)
What Canada’s Flood Map Inventory lists for Bay-Cloverhill: who studied flooding and where to see their maps.
For Bay-Cloverhill the inventory points to Toronto Regional Conservation Authority’s 2021 study, whose map is the one to check.
| Study | By | Year | Status |
|---|---|---|---|
| Toronto Floodline Consolidation | Toronto Regional Conservation Authority | 2021 | final |
Towns with a flood study on file
Mapping in Ontario reaches 69% of towns, Bay-Cloverhill 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.
Flood mapping is shown for Bay-Cloverhill 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.
Ordinary seismic risk in Bay-Cloverhill: $0.043 per $1,000 of buildings a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Bay-Cloverhill’s $0.043 is close to the typical town’s $0.030 (1.4 times as much).
Shaking damage a year per $1,000 of building value
Shaking damage around Bay-Cloverhill 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.
Bay-Cloverhill 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).
For Bay-Cloverhill 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). · Earthquake risk published for the city of Toronto, not by town
2.7% of homes tested around Bay-Cloverhill are over the radon guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Source area for radon tests: the City of Toronto Health Unit
Bay-Cloverhill’s area, at 2.7%, is below the 6.6% of the typical Canadian town, though any one home can still be high.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Bay-Cloverhill’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.
Radon rarely tops the guideline around Bay-Cloverhill, as for 37% of Canada’s 2,611 towns; 63% see 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 low area share in Bay-Cloverhill 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 Bay-Cloverhill
Alerts for Bay-Cloverhill 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. |
Fire danger and active fires near Bay-Cloverhill are mapped daily by the Canadian Wildland Fire Information System; evacuation orders come from the municipality or province.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Bay-Cloverhill
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Bay-Cloverhill | Low | $0.043 | 2.7% | Yes |
| Church-Wellesley 22,415 · 0.4 km | Low | $0.043 | 2.7% | Yes |
| Yonge-Bay Corridor 12,888 · 1.0 km | Low | $0.043 | 2.7% | None listed |
| North St.James Town 18,733 · 1.2 km | Low | $0.043 | 2.7% | Yes |
| Downtown Yonge East 18,251 · 1.4 km | Low | $0.043 | 2.7% | None listed |
| Cabbagetown-South St.James Town 11,205 · 1.4 km | Low | $0.043 | 2.7% | Yes |
| Annex 30,705 · 1.4 km | Low | $0.043 | 2.7% | Yes |
Bay-Cloverhill’s low band tops its neighbours; Church-Wellesley is next (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Bay-Cloverhill faces
What to do about the hazards Bay-Cloverhill 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
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Bay-Cloverhill’s census subdivision (a neighbourhood shows its city’s).
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Bay-Cloverhill is its health region’s, the survey’s design unit.
- 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 Bay-Cloverhill.
- Wildfire counts one way. For Bay-Cloverhill, 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 Bay-Cloverhill
How big is the earthquake risk in Bay-Cloverhill?
NRCan’s model expects shaking to cost buildings in Bay-Cloverhill $0.043 a year for every $1,000 of their value, on average over many years.
Is Bay-Cloverhill at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Bay-Cloverhill since 1986, a low band, though small grass fires aren’t mapped.
Does Bay-Cloverhill flood?
There is flood mapping for Bay-Cloverhill on the national inventory, each study linked to its owner’s map, none of them graded.
Is radon a problem in Bay-Cloverhill?
In Health Canada’s survey, 2.7% of 74 homes tested in Bay-Cloverhill’s area were above 200 Bq/m³, though only a test tells you about one house.
How is Bay-Cloverhill’s Hazard risk Grade worked out?
Bay-Cloverhill’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).