Photo: P199 · CC BY-SA 3.0Flood mapping exists for Dawn-Euphemia: 1 on record, latest by St. Clair Region Conservation Authority
Fire has left almost no mark near Dawn-Euphemia: 0% of the land within 25 km since 1986, 0.000% a year. For earthquakes Dawn-Euphemia is middling, $0.018 a year per $1,000 against $0.030 for the typical town. Radon is about average around Dawn-Euphemia: 8.4% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Dawn-Euphemia grades B+ for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Dawn-Euphemia’s hazards
Four national sources, each read for Dawn-Euphemia: earthquakes, radon, past fires and flood studies.
What Dawn-Euphemia faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Dawn-Euphemia grades B+ for hazard risk
For Dawn-Euphemia, Risk will be the average of earthquakes and radon, with wildfire added only if it makes the average worse.
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.
Few fires near Dawn-Euphemia: 0% within 5 km, 0% within 25 km
Past fire around Dawn-Euphemia’s homes, from the national burned-area record, with the fuel within 5 km.
Forty years of fire maps put Dawn-Euphemia at 0.000% a year, low next to the typical Canadian town’s 0.000%.
Land that isn’t forest covers nearly all the ground around Dawn-Euphemia: forest fuel is 0.1% within 5 km and 0.1% 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 872
Sioux Lookout has the highest burn rate in Ontario, 0.16% a year; around Dawn-Euphemia, as around 639 of the 872 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.
Dawn-Euphemia shares the low band with 92% of Canada’s 2,610 towns, its burn rate rounding to nothing; 7.5% burn faster.
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 Dawn-Euphemia, from St. Clair Region Conservation Authority: 1 on the inventory
What Canada’s Flood Map Inventory lists for Dawn-Euphemia: who studied flooding and where to see their maps.
St. Clair Region Conservation Authority studied flooding in an area that includes Dawn-Euphemia (2009); open its map to see which streets lie in a flood zone.
| Study | By | Year | Status |
|---|---|---|---|
| SCRCA Floodplain Estimation Study for Ontario Regulation 171-06 | St. Clair Region Conservation Authority | 2009 | final · not public |
Towns with a flood study on file
69% of towns in Ontario have a flood study, more than Canada’s 58%; Dawn-Euphemia has one too.
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 Dawn-Euphemia 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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
Earthquakes cost buildings in Dawn-Euphemia $0.018 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
0.6 times the typical $0.030: Dawn-Euphemia’s $0.018 is ordinary.
Shaking damage a year per $1,000 of building value
Below the middle in Ontario: Dawn-Euphemia’s $0.018 against a median of $0.043; Alexandria has $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.
Most of Canada’s 2,611 towns (68%) face more earthquake damage than Dawn-Euphemia.
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 model counts damage to Dawn-Euphemia’s buildings and their occupants from shaking only: not liquefaction, landslides, tsunami or fires after a quake.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Radon about average around Dawn-Euphemia: 8.4% over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
Around Dawn-Euphemia, 8.4% of tested homes topped the guideline, near the typical Canadian town’s 6.6%. For radon tests, the only official count covers all of the Lambton Health Unit, Dawn-Euphemia included.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
More homes top the guideline around Dawn-Euphemia (8.4%) than in the typical town in Ontario (4%); 0.6% went over 600.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Radon tops the guideline in a modest share of homes around Dawn-Euphemia, a band holding 37% of Canada’s 2,611 towns; 26% rank above.
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 share describes the area, not a house: in Dawn-Euphemia as anywhere, test to be sure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Dawn-Euphemia
Alerts for Dawn-Euphemia 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 Dawn-Euphemia to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Dawn-Euphemia’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 |
|---|---|---|---|---|
| Dawn-Euphemia | Low | $0.018 | 8.4% | Yes |
| Brooke-Alvinston 2,557 · 19 km | Low | $0.018 | 8.4% | Yes |
Fire is no heavier anywhere nearby than around Dawn-Euphemia (low), with Brooke-Alvinston next at low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Dawn-Euphemia faces
Practical steps for Dawn-Euphemia’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. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Dawn-Euphemia’s figure is its subdivision’s.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Dawn-Euphemia’s homes since 1986, a history of fire that may lower Risk but never raises it.
- 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 Dawn-Euphemia.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Dawn-Euphemia takes its 2007 health region’s share.
Questions about flooding and hazards in Dawn-Euphemia
Does Dawn-Euphemia flood?
The inventory lists a study touching Dawn-Euphemia; whether a given street floods is on that map, not in the grade.
How big is the earthquake risk in Dawn-Euphemia?
In NRCan’s seismic model, Dawn-Euphemia’s buildings lose $0.018 per $1,000 of value in an average year.
Is Dawn-Euphemia at risk of wildfire?
No meaningful wildfire history near Dawn-Euphemia: 0% of nearby land since 1986, band low.
How is Dawn-Euphemia’s Hazard risk Grade worked out?
Dawn-Euphemia’s Hazard risk grade is B+, built on earthquakes and radon with a one-sided wildfire input.
Is radon a problem in Dawn-Euphemia?
The area’s survey found 8.4% of 178 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Dawn-Euphemia.
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).