Hazard risk in Deerfield is lower than in 89% of Canadian towns
Wildfire isn’t Deerfield’s worry: 0% of the land within 25 km burned since 1986 (0.000% a year). Earthquake risk in Deerfield is ordinary: NRCan’s model puts building losses at $0.030 a year per $1,000 of value, close to the typical town’s $0.030. Fewer homes than usual carry radon here, 0% over the guideline where the typical town has 6.6%. Deerfield grades A for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Deerfield’s hazards
Four national sources, each read for Deerfield: earthquakes, radon, past fires and flood studies.
What Deerfield faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Deerfield grades A for hazard risk
For Deerfield, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #105 of 866 in Ontario and #417 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.
Little of the land around Deerfield has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Deerfield’s residents live, and the fuel next to their homes.
A burn rate of 0.000% a year keeps Deerfield in the low band (the typical Canadian town: 0.000%).
Close to Deerfield there is little to burn (0.1% forest fuel within 5 km), but 5.3% of the land within 25 km is forest.
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
Sioux Lookout has the highest burn rate in Ontario, 0.16% a year; around Deerfield, as around 638 of the 871 towns, it rounds to zero.
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, Deerfield 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.
Deerfield is on the flood map inventory: 1 study, by Toronto Regional Conservation Authority
Flood studies whose area touches Deerfield, from NRCan’s inventory, each linked to its owner.
Toronto Regional Conservation Authority studied flooding in an area that includes Deerfield (2021); open its map to see which streets lie in a flood zone.
| Study | By | Year | Status |
|---|---|---|---|
| Toronto Floodline Consolidation | Toronto Regional Conservation Authority | 2021 | final |
Towns with a flood study on file
Flood maps are common in Ontario: 69% of towns have one, against 58% nationally, and Deerfield is among them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Listed, not scored: a flood study proves a map exists, not that Deerfield floods.
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.
Expected shaking damage in Deerfield: $0.030 a year per $1,000
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
At $0.030 per $1,000, Deerfield’s earthquake risk is the typical Canadian town’s $0.030.
Shaking damage a year per $1,000 of building value
Earthquake risk in Ontario peaks in Alexandria ($0.21); Deerfield, at $0.030, 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.
Neither high nor low for Canada: 48% of the 2,611 towns expect more damage than Deerfield.
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 Deerfield’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). · Earthquake risk: one figure for all of the city of Brampton
0% of homes tested around Deerfield are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Where the typical Canadian town has 6.6% of homes over the guideline, Deerfield’s area has fewer, 0%. For radon tests, the only official count covers all of the Peel Regional Health Unit, Deerfield included.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Deerfield’s area, at 0%, 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.
63% of Canada’s 2,611 towns have a higher share of homes over 200 Bq/m³ than Deerfield’s band, which holds 37%.
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.
The survey sampled homes around Deerfield; it can’t tell you your basement’s level.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Deerfield
Alerts for Deerfield 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. |
Alert Ready carries evacuation orders for Deerfield to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Deerfield’s neighbours compare on hazards
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Deerfield | Low | $0.030 | 0% | Yes |
| Trinity Commons 8,477 · 1.1 km | Low | $0.030 | 0% | Yes |
| Springdale 13,221 · 1.4 km | Low | $0.030 | 0% | Yes |
| M-Section (bramalea) 9,901 · 1.7 km | Low | $0.030 | 0% | Yes |
| Rosedale Village 5,764 · 1.9 km | Low | $0.030 | 0% | Yes |
| Sandalwood West (sunny Meadow) 27,171 · 1.9 km | Low | $0.030 | 0% | Yes |
| N-Section (bramalea) 7,513 · 2.0 km | Low | $0.030 | 0% | Yes |
None of the places around has more fire nearby than Deerfield (low); Trinity Commons comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Deerfield faces
Practical steps for Deerfield’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
- Flood studies aren’t flood zones. A study’s area can be a whole watershed or province, so being on the inventory says a map exists, not that a home in Deerfield floods.
- Radon is a survey. The radon share comes from about 14,000 long-term home tests in 2009–2011, pooled for now by the 2007 health region Deerfield sits in.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Deerfield’s homes since 1986, a history of fire that may lower Risk but never raises it.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Deerfield’s figure is its subdivision’s.
Questions about flooding and hazards in Deerfield
Is Deerfield at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Deerfield since 1986, a low band, though small grass fires aren’t mapped.
How is Deerfield’s Hazard risk Grade worked out?
Hazard risk gives Deerfield A, weighing earthquakes and radon and counting wildfire only against it.
Does Deerfield flood?
Deerfield’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
Is radon a problem in Deerfield?
The area’s survey found 0% of 90 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Deerfield.
How big is the earthquake risk in Deerfield?
About $0.030 a year per $1,000 of building value, NRCan’s long-run expectation for Deerfield.
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).