Photo: JFVoll · CC BY-SA 3.0Flood mapping exists for Southdale: 1 on record, latest by Grand River Conservation Authority
Around Southdale, wildfire is practically absent from the record: 0% within 25 km since 1986, 0.000% a year. Seismic risk in Southdale sits near the middle: $0.022 of expected damage per $1,000 of buildings a year, the typical town $0.030. In Health Canada’s survey, just 4% of homes tested in the area exceeded 200 Bq/m³ (6.6% typical). Southdale grades A− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Southdale’s hazards
Four national sources, each read for Southdale: earthquakes, radon, past fires and flood studies.
What Southdale faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Southdale: A−
Two inputs always count for Southdale, earthquakes and radon; the third, wildfire, counts only against a town.
Its place: #237 of 866 in Ontario and #594 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 Southdale has burned: 0% within 5 km, 0% within 25 km since 1986
Past fire around Southdale’s homes, from the national burned-area record, with the fuel within 5 km.
Around Southdale fire takes 0.000% of the land in a typical year, the typical Canadian town 0.000%, which is low.
With 0.9% forest fuel within 5 km and 3.2% within 25 km, the land around Southdale gives a fire little to burn.
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 Southdale, 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.
Only 7.5% of Canada’s 2,610 towns are above the low band, which holds 92%; Southdale, at a rounded zero, is far from them.
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.
Southdale is on the flood map inventory: 1 study, by Grand River Conservation Authority
What Canada’s Flood Map Inventory lists for Southdale: who studied flooding and where to see their maps.
One study on the inventory touches Southdale, Grand River Conservation Authority’s from 2018, and its area can be large, so it says a map exists, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| Grand River Regulatory Floodplain | Grand River Conservation Authority | 2018 | final |
Towns with a flood study on file
Flood maps are common in Ontario: 69% of towns have one, against 58% nationally, and Southdale is among 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 Southdale’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.”
Natural Resources Canada, Canada Flood Map Inventory; links go to each study’s owner.
Expected shaking damage in Southdale: $0.022 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Earthquake losses in Southdale, $0.022 per $1,000, are in line with the typical $0.030 (0.7 times).
Shaking damage a year per $1,000 of building value
Earthquake risk in Ontario peaks in Alexandria ($0.21); Southdale, at $0.022, 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.
Southdale sits mid-range among Canada’s 2,611 towns: 61% 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).
The model counts damage to Southdale’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). · Earthquake risk: one figure for all of the city of Kitchener
Radon runs low around Southdale: 4% of tested homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
A lower share than most: 4% of tested homes around Southdale, the typical Canadian town 6.6%. Southdale doesn’t get its own radon tests figures; the ones here come from the Waterloo Health Unit.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The typical town in Ontario has 4% over 200 Bq/m³; Southdale’s area has 4%, much the same.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
The quietest radon band, under 5%, holds 37% of Canada’s 2,611 towns and Southdale; 63% sit higher.
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 Southdale as anywhere, test to be sure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Southdale
Environment and Climate Change Canada issues the weather alerts for Southdale; 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 Southdale, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Southdale
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Southdale | Low | $0.022 | 4% | Yes |
| Mill Courtland Woodside Park 3,319 · 1.1 km | Low | $0.022 | 4% | Yes |
| Cedar Hill 3,190 · 1.3 km | Low | $0.022 | 4% | Yes |
| Meinzinger Park-Lakeside 5,007 · 1.5 km | Low | $0.022 | 4% | Yes |
| Alpine 3,055 · 1.6 km | Low | $0.022 | 4% | Yes |
| Victoria Park 3,574 · 1.7 km | Low | $0.022 | 4% | Yes |
| Laurentian Hills 10,026 · 1.8 km | Low | $0.022 | 4% | Yes |
None of the places around has more fire nearby than Southdale (low); Mill Courtland Woodside Park comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Southdale faces
What to do about the hazards Southdale 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?
- 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. The radon share comes from about 14,000 long-term home tests in 2009–2011, pooled for now by the 2007 health region Southdale sits in.
- 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 Southdale floods.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Southdale’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 Southdale’s.
Questions about flooding and hazards in Southdale
Is Southdale at risk of wildfire?
No meaningful wildfire history near Southdale: 0% of nearby land since 1986, band low.
Is radon a problem in Southdale?
In Health Canada’s survey, 4% of 101 homes tested in Southdale’s area were above 200 Bq/m³, though only a test tells you about one house.
Does Southdale flood?
Southdale’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
How is Southdale’s Hazard risk Grade worked out?
Hazard risk gives Southdale A−, weighing earthquakes and radon and counting wildfire only against it.
How big is the earthquake risk in Southdale?
In NRCan’s seismic model, Southdale’s buildings lose $0.022 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).