Photo: WabbitWanderer from London, Canada · CC BY-SA 2.0Hazard risk in Stoneybrook is lower than in 90% of Canadian towns
Fire has left almost no mark near Stoneybrook: 0% of the land within 25 km since 1986, 0.000% a year. Earthquake risk in Stoneybrook is ordinary: NRCan’s model puts building losses at $0.020 a year per $1,000 of value, close to the typical town’s $0.030. Radon is lower than usual: 1.8% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Stoneybrook grades A for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Stoneybrook’s hazards
Four national sources, each read for Stoneybrook: earthquakes, radon, past fires and flood studies.
What Stoneybrook faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Stoneybrook: A
For Stoneybrook, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
Its place: #43 of 866 in Ontario and #347 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Small fires and grass fires are largely missing from the national burned-area record.
Little of the land around Stoneybrook has burned: 0% within 5 km, 0% within 25 km since 1986
Past fire around Stoneybrook’s homes, from the national burned-area record, with the fuel within 5 km.
A burn rate of 0.000% a year keeps Stoneybrook in the low band (the typical Canadian town: 0.000%).
Only 0.5% of the land within 25 km of Stoneybrook is forest fuel, and 0.9% close in.
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
Little or nothing burns around Stoneybrook in a typical year; 638 of the 871 towns in Ontario share that, and Sioux Lookout leads 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.
Measured against 2,610 towns, Stoneybrook 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.
No flood study is listed for Stoneybrook
What Canada’s Flood Map Inventory lists for Stoneybrook: who studied flooding and where to see their maps.
The inventory has nothing for Stoneybrook, but a local or conservation-authority map may still exist.
Towns with a flood study on file
Stoneybrook has no flood study on file, though 69% of towns in Ontario do (Canada: 58%).
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 Stoneybrook 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.”
Expected shaking damage in Stoneybrook: $0.020 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
With $0.020 of shaking damage a year per $1,000, Stoneybrook is about even with the typical $0.030 (0.7 times).
Shaking damage a year per $1,000 of building value
The typical town in Ontario expects $0.043 a year in shaking damage; Stoneybrook expects less, $0.020, and Alexandria the most, $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.
Stoneybrook sits mid-range among Canada’s 2,611 towns: 64% 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).
Roads, pipes and bridges aren’t in Stoneybrook’s figure, nor landslides or tsunami: it is buildings and shaking.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean). · Not measured by town: earthquake risk (the city of London)
Little radon around Stoneybrook: 1.8% of area homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Stoneybrook’s area, at 1.8%, is below the 6.6% of the typical Canadian town, though any one home can still be high. For radon tests, the only official count covers all of the Middlesex-London Health Unit, Stoneybrook included.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs lower around Stoneybrook than in most towns in Ontario: 1.8% against 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 Stoneybrook’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.
Basements, soil and how a house is sealed decide its radon, so in Stoneybrook only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Stoneybrook
Alerts for Stoneybrook 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 Stoneybrook 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)
How Stoneybrook’s neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Stoneybrook | Low | $0.020 | 1.8% | None listed |
| Stoney Creek 9,387 · 1.1 km | Low | $0.020 | 1.8% | None listed |
| Uplands 8,819 · 2.0 km | Low | $0.020 | 1.8% | None listed |
| Carling 21,536 · 2.6 km | Low | $0.020 | 1.8% | None listed |
| Masonville 10,359 · 2.9 km | Low | $0.020 | 1.8% | None listed |
| North London 9,584 · 3.2 km | Low | $0.020 | 1.8% | None listed |
| Huron Heights 20,890 · 3.4 km | Low | $0.020 | 1.8% | None listed |
Stoneybrook’s low band tops its neighbours; Stoney Creek is next (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Stoneybrook faces
Practical steps for Stoneybrook’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?
- 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. The flood inventory points to maps; it is incomplete and not the official source, so ask the municipality about any street in Stoneybrook.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Stoneybrook takes its 2007 health region’s share.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Stoneybrook’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
- Earthquakes are modelled. Shaking damage is modelled from the ground, the buildings and the odds of each quake, and published for whole subdivisions such as Stoneybrook’s.
Questions about flooding and hazards in Stoneybrook
How is Stoneybrook’s Hazard risk Grade worked out?
Stoneybrook’s Hazard risk grade is A, built on earthquakes and radon with a one-sided wildfire input.
Is radon a problem in Stoneybrook?
The area’s survey found 1.8% of 110 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Stoneybrook.
Is Stoneybrook at risk of wildfire?
The burned-area record shows next to nothing around Stoneybrook (0% within 25 km since 1986), so its band is low.
Does Stoneybrook flood?
The inventory has 0 studies for Stoneybrook, and an empty list isn’t a clean bill: the municipality holds any flood maps.
How big is the earthquake risk in Stoneybrook?
In NRCan’s seismic model, Stoneybrook’s buildings lose $0.020 per $1,000 of value in an average year.
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).