Photo: Harpreet Sandhu · CC BY-SA 4.0Castleridge’s hazards at a glance: a low wildfire record and 8.1% of area homes over the radon guideline
The national fire record shows next to nothing around Castleridge, 0% of the land within 25 km since 1986 (0.000% a year). Earthquake risk in Castleridge is ordinary: NRCan’s model puts building losses at $0.023 a year per $1,000 of value, close to the typical town’s $0.030. Hazard risk gives Castleridge a grade of B+, from earthquakes and radon alone.
What stands out about Castleridge’s hazards
Four national sources, each read for Castleridge: earthquakes, radon, past fires and flood studies.
What Castleridge faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Castleridge grades B+ for hazard risk
The grade weighs Castleridge’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
Its place: #282 of 474 in Alberta and #1,102 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.
Few fires near Castleridge: 0% within 5 km, 0% within 25 km
Fires mapped since 1986 around where Castleridge’s residents live, and the fuel next to their homes.
Low by Canadian standards: 0.000% of the land a year around Castleridge, 0.000% for the typical Canadian town.
Castleridge’s homes have had no fire within 5 km since 1986; the closest was 18 km away.
Little near Castleridge’s homes can carry a forest fire; only 0% of the land within 5 km is forest fuel, and 0.4% 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 Alberta · highest of 478
Near-zero burning puts Castleridge with 386 of the 478 towns in Alberta, far below Wainwright at 1.43%.
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.
Like most of Canada’s 2,610 towns (92%), Castleridge is in the low band, with a burn rate of zero to three decimals; 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.
The flood map inventory lists nothing for Castleridge
Flood studies whose area touches Castleridge, from NRCan’s inventory, each linked to its owner.
Canada’s Flood Map Inventory lists no study whose area touches Castleridge, which doesn’t mean it has never been mapped.
Towns with a flood study on file
Only 46% of towns in Alberta have a flood study, short of Canada’s 58%, and Castleridge is not among them.
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 Castleridge 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.”
Ordinary seismic risk in Castleridge: $0.023 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.
Nothing unusual about Castleridge’s ground: $0.023 against a typical $0.030, 0.8 times.
Nobody publishes earthquake risk for Castleridge alone, so this card uses the figure for the city of Calgary.
Shaking damage a year per $1,000 of building value
Castleridge’s $0.023 tops the median in Alberta, $0.013, though Black Diamond reaches $0.048.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Castleridge sits mid-range among Canada’s 2,611 towns: 54% 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 loss is to Castleridge’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).
Radon about average around Castleridge: 8.1% over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
The survey area of Castleridge reads 8.1%, a shade from the typical Canadian town’s 6.6%. For radon tests, the only official count covers all of the Calgary Health Region, Castleridge included.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon around Castleridge is ordinary for towns in Alberta: 8.1%, beside a median of 7.5%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
26% of Canada’s 2,611 towns have more homes over 200 Bq/m³ than Castleridge’s 5–10% 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 Castleridge; 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 Castleridge
Alerts for Castleridge 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 Castleridge 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)
Hazards in the places around Castleridge
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Castleridge | Low | $0.023 | 8.1% | None listed |
| Falconridge 10,218 · 1.3 km | Low | $0.023 | 8.1% | None listed |
| Martindale 14,467 · 1.3 km | Low | $0.023 | 8.1% | None listed |
| Whitehorn 11,273 · 1.9 km | Low | $0.023 | 8.1% | None listed |
| Coral Springs 5,542 · 2.2 km | Low | $0.023 | 8.1% | None listed |
| Temple 10,545 · 2.2 km | Low | $0.023 | 8.1% | None listed |
| Taradale 17,911 · 2.6 km | Low | $0.023 | 8.1% | None listed |
The neighbour with the most fire is Falconridge (low), still no more than Castleridge (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Castleridge faces
What to do about the hazards Castleridge 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?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
What this data can and can’t tell you
- 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 Castleridge’s.
- Radon is a survey. Radon figures pool the survey’s home tests by area: postal areas once their boundaries arrive, the 2007 health region around Castleridge until then.
- Flood studies aren’t flood zones. Flood studies cover areas of every size, which is why the page lists them for Castleridge without grading them.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Castleridge’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
Questions about flooding and hazards in Castleridge
Is radon a problem in Castleridge?
In Health Canada’s survey, 8.1% of 86 homes tested in Castleridge’s area were above 200 Bq/m³, though only a test tells you about one house.
How is Castleridge’s Hazard risk Grade worked out?
Castleridge’s Hazard risk grade is B+, built on earthquakes and radon with a one-sided wildfire input.
Is Castleridge at risk of wildfire?
Less than most of Canada: 0% of the land within 25 km of Castleridge has burned since 1986, the last in 2014, a low band that leaves Risk alone.
Does Castleridge flood?
Nothing is listed for Castleridge on the national inventory (0); local maps may still exist with the municipality.
How big is the earthquake risk in Castleridge?
About $0.023 a year per $1,000 of building value, NRCan’s long-run expectation for Castleridge.
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).