Hazards in Crestview-Tanglewood: wildfire low, radon over the guideline in 6.2% of tested homes
The burned-area map is nearly blank around Crestview-Tanglewood, 0% within 25 km since 1986, 0.000% a year. Seismic risk runs high: $0.15 of expected damage per $1,000 of buildings a year, the typical town $0.030. Hazard risk gives Crestview-Tanglewood a grade of C+, from earthquakes and radon alone.
What stands out about Crestview-Tanglewood’s hazards
For Crestview-Tanglewood, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Crestview-Tanglewood faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Crestview-Tanglewood: C+
Earthquake risk and radon make Crestview-Tanglewood’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
Its place: #703 of 866 in Ontario and #1,894 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Only 64 homes were tested in the survey area, so the radon share is rough. The burned-area record misses fires under about 10 ha and most grass and farm fires.
Little of the land around Crestview-Tanglewood has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Crestview-Tanglewood’s residents live, and the fuel next to their homes.
Low: the land around Crestview-Tanglewood burns at 0.000% a year, where the typical Canadian town sees 0.000%.
Since 1986 the nearest fire to Crestview-Tanglewood’s homes came within 20 km, never inside 5 km.
Forest fuel rises from 1.3% within 5 km of Crestview-Tanglewood to 8% within 25 km: the fuel lies away from homes.
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 Crestview-Tanglewood 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.
Crestview-Tanglewood 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.
No flood study is listed for Crestview-Tanglewood
Flood studies whose area touches Crestview-Tanglewood, from NRCan’s inventory, each linked to its owner.
An empty entry for Crestview-Tanglewood on the inventory isn’t proof of safety; ask locally for flood maps.
Towns with a flood study on file
69% of towns in Ontario have a flood study, more than Canada’s 58%; Crestview-Tanglewood is not yet one of 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 Crestview-Tanglewood’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.”
Shaking is Crestview-Tanglewood’s costliest hazard: $0.15 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.
Crestview-Tanglewood’s $0.15 is about 5 times the typical town’s $0.030: it sits in one of Canada’s more active seismic zones.
Crestview-Tanglewood doesn’t get its own earthquake risk figures; the ones here come from the city of Ottawa.
Shaking damage a year per $1,000 of building value
Crestview-Tanglewood’s $0.15 tops the median in Ontario, $0.043, though Alexandria reaches $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.
Crestview-Tanglewood sits above most of Canada’s 2,611 towns on earthquake risk; 15% are higher.
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).
For Crestview-Tanglewood the model prices shaking damage to buildings, nothing more.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
6.2% of homes tested around Crestview-Tanglewood are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Crestview-Tanglewood’s area, at 6.2%, is close to the 6.6% of the typical Canadian town.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Crestview-Tanglewood’s area, at 6.2%, is above the median in Ontario (4%).
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 Crestview-Tanglewood, 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.
Radon varies from house to house in Crestview-Tanglewood, so the survey is a reason to test, not a result for yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Area behind the radon tests figures: the City of Ottawa Health Unit
Where to get warnings in Crestview-Tanglewood
Environment and Climate Change Canada issues the weather alerts for Crestview-Tanglewood; 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. |
For fires near Crestview-Tanglewood, the national fire information system maps danger and active fires daily; local authorities give any evacuation order.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Crestview-Tanglewood
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Crestview-Tanglewood | Low | $0.15 | 6.2% | None listed |
| City View 6,468 · 1.7 km | Low | $0.15 | 6.2% | None listed |
| Craig Henry - Manordale 8,758 · 2.0 km | Low | $0.15 | 6.2% | None listed |
| Borden Farm - Fisher Glen 11,100 · 2.3 km | Low | $0.15 | 6.2% | Yes |
| Centrepointe - Briargreen 9,259 · 2.5 km | Low | $0.15 | 6.2% | None listed |
| Braemar Park-Belair Heights-Copeland Park 9,248 · 2.5 km | Low | $0.15 | 6.2% | None listed |
| Fisher Heights 6,451 · 2.8 km | Low | $0.15 | 6.2% | None listed |
Braemar Park-Belair Heights-Copeland Park burns a little more than Crestview-Tanglewood, in the same low band (low here).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Crestview-Tanglewood faces
Practical steps for Crestview-Tanglewood’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.
- Drop, cover and hold on.
- Strap the water heater down.
- Keep 72 hours of supplies.
- Has it had a radon test?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
- Is earthquake cover included?
What this data can and can’t tell you
- Wildfire counts one way. Burned land within 25 km of where people live, averaged over 1986–2025 and checked for fuel near homes, is the measure; it looks back, not ahead, and only ever counts against Crestview-Tanglewood.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Crestview-Tanglewood takes its 2007 health region’s share.
- 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 Crestview-Tanglewood.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Crestview-Tanglewood’s included.
Questions about flooding and hazards in Crestview-Tanglewood
Is Crestview-Tanglewood at risk of wildfire?
Not much by Canadian standards: Crestview-Tanglewood’s band is low, with 0% of the land within 25 km burned since 1986 (last in 2014), so wildfire doesn’t change its grade.
Does Crestview-Tanglewood flood?
No study on Canada’s Flood Map Inventory covers Crestview-Tanglewood (0), which doesn’t mean it has never been mapped, so ask the municipality.
Is radon a problem in Crestview-Tanglewood?
6.2% of the 64 homes Health Canada tested around Crestview-Tanglewood topped the guideline; your own house needs its own test.
How is Crestview-Tanglewood’s Hazard risk Grade worked out?
Hazard risk gives Crestview-Tanglewood C+, weighing earthquakes and radon and counting wildfire only against it.
How big is the earthquake risk in Crestview-Tanglewood?
Expected earthquake damage in Crestview-Tanglewood comes to $0.15 a year for each $1,000 that buildings are worth.
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).