Photo: GTD Aquitaine · Public domainA flood study covers Ionview: 1 on the national inventory, the newest from Toronto Regional Conservation Authority
Wildfire isn’t Ionview’s worry: 0% of the land within 25 km burned since 1986 (0.001% a year). Earthquake risk in Ionview 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%. Hazard risk gives Ionview a grade of A−; its wildfire band pulls it down.
What stands out about Ionview’s hazards
For Ionview, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Ionview faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Ionview: A−
Earthquake risk and radon make Ionview’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
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. Only 74 homes were tested in the survey area, so the radon share is rough. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Ionview has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Ionview’s residents live, and the fuel next to their homes.
A burn rate of 0.001% a year keeps Ionview in the low band (the typical Canadian town: 0.000%).
Since 1986 the nearest fire to Ionview’s homes came within 17 km, never inside 5 km.
Little near Ionview’s homes can carry a forest fire; only 0.3% of the land within 5 km is forest fuel, and 2.4% 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
The land around Ionview burns at 0.001% a year, the 83rd highest rate of 871 towns in Ontario; Sioux Lookout tops it 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.
Some fire is mapped around Ionview, but not enough to leave the low band, where 92% of Canada’s 2,610 towns are; 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.
A flood study covers Ionview, from Toronto Regional Conservation Authority: 1 on the inventory
Flood studies whose area touches Ionview, from NRCan’s inventory, each linked to its owner.
For Ionview 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
69% of towns in Ontario have a flood study, more than Canada’s 58%; Ionview has one too.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood studies don’t enter the grade; they are listed so you can open the official map for Ionview.
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 Ionview: $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.
Ionview’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
Typical for its province: Ionview at $0.043 beside a median in Ontario of $0.043, with Alexandria on top 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.
Ionview 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).
What a quake does after the shaking, fire, landslides, tsunami, falls outside NRCan’s figure for Ionview.
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
Little radon around Ionview: 2.7% of area homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Radon runs below the typical Canadian town (6.6%) in Ionview’s area, at 2.7%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Ionview’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.
Few tests over the guideline: Ionview shares the bottom band with 37% of Canada’s 2,611 towns, below the other 63%.
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.
Health Canada advises testing every home, Ionview’s included, whatever the area’s figure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Area behind the radon tests figures: the City of Toronto Health Unit
Where to get warnings in Ionview
Alerts for Ionview 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. |
Evacuation orders for Ionview come from the municipality or the province, while CWFIS maps fire danger every day.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Ionview
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Ionview | Low | $0.043 | 2.7% | Yes |
| Kennedy Park 17,156 · 1.4 km | Low | $0.043 | 2.7% | Yes |
| Clairlea-Birchmount 27,690 · 2.2 km | Low | $0.043 | 2.7% | Yes |
| Eglinton East 22,820 · 2.3 km | Low | $0.043 | 2.7% | Yes |
| Bendale South 10,885 · 2.5 km | Low | $0.043 | 2.7% | Yes |
| Victoria Village 17,647 · 2.9 km | Low | $0.043 | 2.7% | Yes |
| Cliffcrest 16,184 · 3.0 km | Low | $0.043 | 2.7% | Yes |
Fire is no heavier anywhere nearby than around Ionview (low), with Kennedy Park next at low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Ionview faces
Practical steps for Ionview’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
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Ionview is its health region’s, the survey’s design unit.
- Wildfire counts one way. Burned land within 25 km of where people live, averaged over 1986–2025 and checked for fuel near homes, is the measure; it looks back, not ahead, and only ever counts against Ionview.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Ionview’s included.
- 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 Ionview.
Questions about flooding and hazards in Ionview
Is radon a problem in Ionview?
2.7% of the 74 homes Health Canada tested around Ionview topped the guideline; your own house needs its own test.
How is Ionview’s Hazard risk Grade worked out?
Ionview’s Hazard risk grade is A−, built on earthquakes and radon with a one-sided wildfire input.
Is Ionview at risk of wildfire?
Not much by Canadian standards: Ionview’s band is low, with 0% of the land within 25 km burned since 1986 (last in 2001), so wildfire doesn’t change its grade.
Does Ionview flood?
There is flood mapping for Ionview on the national inventory, each study linked to its owner’s map, none of them graded.
How big is the earthquake risk in Ionview?
Expected earthquake damage in Ionview comes to $0.043 a year for each $1,000 that buildings are worth.
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).