Photo: P199 · CC BY-SA 3.0Innisfil faces fewer hazards than 94% of Canadian towns
Little of the land around Innisfil has burned: 0% within 25 km since 1986, or 0.001% a year. Earthquake risk in Innisfil is ordinary: NRCan’s model puts building losses at $0.019 a year per $1,000 of value, close to the typical town’s $0.030. In Health Canada’s survey, just 0.9% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Hazard risk gives Innisfil a grade of A; its wildfire band pulls it down.
What stands out about Innisfil’s hazards
Four national sources, each read for Innisfil: earthquakes, radon, past fires and flood studies.
What Innisfil faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Innisfil grades A for hazard risk
Two inputs always count for Innisfil, earthquakes and radon; the third, wildfire, counts only against a town.
Its place: #21 of 866 in Ontario and #263 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Small fires and grass fires are largely missing from the national burned-area record.
Few fires near Innisfil: 0.2% within 5 km, 0% within 25 km
Fires mapped since 1986 around where Innisfil’s residents live, and the fuel next to their homes.
With 0.001% burned a year, Innisfil is among the many low-band places (the typical Canadian town 0.000%).
There is forest near Innisfil’s homes (6.9% within 5 km) and more of it further out (13% 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
In the top quarter in Ontario: Innisfil ranks 83rd of 871 at 0.001% a year, with Sioux Lookout first at 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.
Low, like 92% of the country’s 2,610 towns: the land around Innisfil burns, but slower than in the 7.5% 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.
The flood map inventory lists nothing for Innisfil
Flood studies whose area touches Innisfil, from NRCan’s inventory, each linked to its owner.
NRCan’s inventory is silent on Innisfil, so any flood map would be the municipality’s own.
Towns with a flood study on file
69% of towns in Ontario have a flood study, more than Canada’s 58%; Innisfil is not yet one of them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood is shown here, never graded: a study says where a map exists, not how many of Innisfil’s homes stand in a flood zone.
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.”
Earthquakes cost buildings in Innisfil $0.019 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.
0.6 times the typical $0.030: Innisfil’s $0.019 is ordinary.
Shaking damage a year per $1,000 of building value
At $0.019, Innisfil is below the typical town 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.
66% of Canada’s 2,611 towns expect more shaking damage than Innisfil.
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 Innisfil’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).
Radon runs low around Innisfil: 0.9% of tested homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Innisfil’s area, at 0.9%, is below the 6.6% of the typical Canadian town, though any one home can still be high. Figures for radon tests are published for the Simcoe Muskoka District Health Unit as a whole, not for Innisfil alone.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The median in Ontario is 4% over 200 Bq/m³; around Innisfil it is 0.9%.
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 Innisfil, 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.
One home in Innisfil 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 Innisfil
Environment and Climate Change Canada issues the weather alerts for Innisfil; 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 Innisfil, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Innisfil’s neighbours compare on hazards
The same four hazards for the places next door.
Among its neighbours Innisfil has the most fire on record (low); Keswick follows (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Innisfil faces
What to do about the hazards Innisfil 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?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
What this data can and can’t tell you
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Innisfil without grading them.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Innisfil’s figure is its subdivision’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 Innisfil until then.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Innisfil’s homes since 1986, a history of fire that may lower Risk but never raises it.
Questions about flooding and hazards in Innisfil
How big is the earthquake risk in Innisfil?
Expected earthquake damage in Innisfil comes to $0.019 a year for each $1,000 that buildings are worth.
How is Innisfil’s Hazard risk Grade worked out?
Innisfil’s Hazard risk grade is A, built on earthquakes and radon with a one-sided wildfire input.
Is radon a problem in Innisfil?
In Health Canada’s survey, 0.9% of 109 homes tested in Innisfil’s area were above 200 Bq/m³, though only a test tells you about one house.
Does Innisfil flood?
Nothing is listed for Innisfil on the national inventory (0); local maps may still exist with the municipality.
Is Innisfil at risk of wildfire?
Less than most of Canada: 0% of the land within 25 km of Innisfil has burned since 1986, the last in 2006, a low band that leaves Risk alone.
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).