Photo: Jfvoll · CC BY-SA 4.0Adjala-Tosorontio faces fewer hazards than 96% of Canadian towns
Fire has left almost no mark near Adjala-Tosorontio: 0% of the land within 25 km since 1986, 0.000% a year. For earthquakes Adjala-Tosorontio is middling, $0.017 a year per $1,000 against $0.030 for the typical town. In Health Canada’s survey, just 0.9% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Adjala-Tosorontio grades A+ for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Adjala-Tosorontio’s hazards
For Adjala-Tosorontio, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Adjala-Tosorontio faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Adjala-Tosorontio: A+
For Adjala-Tosorontio, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #14 of 866 in Ontario and #237 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Wildfire is rare near Adjala-Tosorontio: 0% of the land within 25 km burned since 1986, 0% within 5 km
Fires mapped since 1986 around where Adjala-Tosorontio’s residents live, and the fuel next to their homes.
A burn rate of 0.000% a year keeps Adjala-Tosorontio in the low band (the typical Canadian town: 0.000%).
19% of the land within 5 km of Adjala-Tosorontio is forest fuel, close to the 14% 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, Adjala-Tosorontio 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.
Measured against 2,610 towns, Adjala-Tosorontio is in the largest group, low (92%), and at its floor, while 7.5% rank higher.
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 Adjala-Tosorontio is mapped in 2 studies, the newest by Nottawasaga Valley Conservation Authority
Flood studies whose area touches Adjala-Tosorontio, from NRCan’s inventory, each linked to its owner.
Nottawasaga Valley Conservation Authority and others have studied flooding in areas that include Adjala-Tosorontio: 2 studies, the latest from 2024.
| Study | By | Year | Status |
|---|---|---|---|
| Upper Mad River Flood Hazard Study | Nottawasaga Valley Conservation Authority | 2024 | final |
| Toronto Floodline Consolidation | Toronto Regional Conservation Authority | 2021 | final |
Towns with a flood study on file
Mapping in Ontario reaches 69% of towns, Adjala-Tosorontio 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 Adjala-Tosorontio.
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.
Earthquakes cost buildings in Adjala-Tosorontio $0.017 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.
Earthquake losses in Adjala-Tosorontio, $0.017 per $1,000, are in line with the typical $0.030 (0.6 times).
Shaking damage a year per $1,000 of building value
Earthquake risk in Ontario peaks in Alexandria ($0.21); Adjala-Tosorontio, at $0.017, is below the median of $0.043.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Earthquakes cost less around Adjala-Tosorontio than in 70% of Canada’s 2,611 towns.
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 Adjala-Tosorontio 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).
0.9% of homes tested around Adjala-Tosorontio are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Source area for radon tests: the Simcoe Muskoka District Health Unit
At 0.9% over the guideline, the area around Adjala-Tosorontio is 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 Adjala-Tosorontio has fewer high tests: 0.9%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Under 5% puts Adjala-Tosorontio 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.
Radon varies from house to house in Adjala-Tosorontio, so the survey is a reason to test, not a result for yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Adjala-Tosorontio
Environment and Climate Change Canada issues the weather alerts for Adjala-Tosorontio; 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 Adjala-Tosorontio, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Adjala-Tosorontio’s neighbours compare on hazards
The same four hazards for the places next door.
Alliston burns a little more than Adjala-Tosorontio, in the same low band (low here).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Adjala-Tosorontio faces
Practical steps for Adjala-Tosorontio’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
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Adjala-Tosorontio’s census subdivision (a neighbourhood shows its city’s).
- 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 Adjala-Tosorontio until then.
- Wildfire counts one way. For Adjala-Tosorontio, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Adjala-Tosorontio without grading them.
Questions about flooding and hazards in Adjala-Tosorontio
How big is the earthquake risk in Adjala-Tosorontio?
Expected earthquake damage in Adjala-Tosorontio comes to $0.017 a year for each $1,000 that buildings are worth.
How is Adjala-Tosorontio’s Hazard risk Grade worked out?
Adjala-Tosorontio grades A+ for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
Is radon a problem in Adjala-Tosorontio?
The area’s survey found 0.9% of 109 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Adjala-Tosorontio.
Does Adjala-Tosorontio flood?
A flood study covers Adjala-Tosorontio on Canada’s Flood Map Inventory; open the owner’s map to check a street, since flood isn’t graded.
Is Adjala-Tosorontio at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Adjala-Tosorontio since 1986, a low band, though small grass fires aren’t mapped.
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).