Photo: Earth Science and Remote Sensing Unit , Lyndon B. Johnson Space Center · Public domainRideaucrest - Davidson Heights is on Canada’s flood inventory: 2 listed, led by Rideau Valley Conservation Authority
Wildfire isn’t Rideaucrest - Davidson Heights’ worry: 0% of the land within 25 km burned since 1986 (0.000% a year). Shaking is a bigger worry than in most places, at $0.15 a year per $1,000 of building value ($0.030 typical). Radon is about average around Rideaucrest - Davidson Heights: 6.2% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Rideaucrest - Davidson Heights grades C+ for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Rideaucrest - Davidson Heights’s hazards
Four national sources, each read for Rideaucrest - Davidson Heights: earthquakes, radon, past fires and flood studies.
What Rideaucrest - Davidson Heights faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Rideaucrest - Davidson Heights: C+
The grade weighs Rideaucrest - Davidson Heights’ seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
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. Small fires and grass fires are largely missing from the national burned-area record.
Little of the land around Rideaucrest - Davidson Heights has burned: 0% within 5 km, 0% within 25 km since 1986
Past fire around Rideaucrest - Davidson Heights’ homes, from the national burned-area record, with the fuel within 5 km.
Low by Canadian standards: 0.000% of the land a year around Rideaucrest - Davidson Heights, 0.000% for the typical Canadian town.
The forest starts beyond town: 1.6% of the land within 5 km of Rideaucrest - Davidson Heights’ homes is forest fuel, against 8% 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 871
Among the 871 towns in Ontario, Sioux Lookout burns fastest (0.16% a year); Rideaucrest - Davidson Heights is with the 638 near 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.
Measured against 2,610 towns, Rideaucrest - Davidson Heights 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.
Flooding around Rideaucrest - Davidson Heights is mapped in 2 studies, the newest by Rideau Valley Conservation Authority
What Canada’s Flood Map Inventory lists for Rideaucrest - Davidson Heights: who studied flooding and where to see their maps.
The newest of 2 studies covering Rideaucrest - Davidson Heights is Rideau Valley Conservation Authority’s, from 2017; open its map to see the zones.
| Study | By | Year | Status |
|---|---|---|---|
| Rideau River, Hogs Back to Kars | Rideau Valley Conservation Authority | 2017 | final |
| Jock River | Rideau Valley Conservation Authority | 2005 | final |
Towns with a flood study on file
Flood maps are common in Ontario: 69% of towns have one, against 58% nationally, and Rideaucrest - Davidson Heights is among them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood mapping around Rideaucrest - Davidson Heights has come in steps: 2 studies from the 2000s to the 2010s.
Study dates as the NRCan inventory lists them, one count per study touching Rideaucrest - Davidson Heights.
Flood studies don’t enter the grade; they are listed so you can open the official map for Rideaucrest - Davidson Heights.
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.
Shaking is Rideaucrest - Davidson Heights’ costliest hazard: $0.15 a year per $1,000
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
The typical town loses $0.030 a year to shaking; Rideaucrest - Davidson Heights loses $0.15, 5 times as much.
Rideaucrest - Davidson Heights shares its earthquake risk numbers with the rest of the city of Ottawa.
Shaking damage a year per $1,000 of building value
The typical town in Ontario expects $0.043 a year; Rideaucrest - Davidson Heights expects $0.15, and Alexandria $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.
More earthquake risk than most: only 15% of Canada’s 2,611 towns are above Rideaucrest - Davidson Heights.
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 Rideaucrest - Davidson Heights’ 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).
6.2% of homes tested around Rideaucrest - Davidson Heights are over the radon guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Shared with the rest of the City of Ottawa Health Unit: radon tests
The survey area of Rideaucrest - Davidson Heights reads 6.2%, a shade from the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The median in Ontario is 4% over 200 Bq/m³; the survey area around Rideaucrest - Davidson Heights has 6.2%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
A middling share of high tests puts Rideaucrest - Davidson Heights with 37% of Canada’s 2,611 towns, below 26% of them.
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 Rideaucrest - Davidson Heights; 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 Rideaucrest - Davidson Heights
Alerts for Rideaucrest - Davidson Heights 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 Rideaucrest - Davidson Heights 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 Rideaucrest - Davidson Heights’ neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Rideaucrest - Davidson Heights | Low | $0.15 | 6.2% | Yes |
| Chapman Mills 12,075 · 2.0 km | Low | $0.15 | 6.2% | Yes |
| Old Barrhaven East 23,585 · 2.0 km | Low | $0.15 | 6.2% | None listed |
| Riverside South - Leitrim 19,802 · 2.2 km | Low | $0.15 | 6.2% | Yes |
| Stonebridge - Half Moon Bay 28,714 · 4.2 km | Low | $0.15 | 6.2% | Yes |
| Merivale Gardens - Grenfell Glen - Pineglen - Country Place 4,172 · 4.7 km | Low | $0.15 | 6.2% | Yes |
| Old Barrhaven West 22,012 · 4.8 km | Low | $0.15 | 6.2% | Yes |
None of the places around has more fire nearby than Rideaucrest - Davidson Heights (low); Chapman Mills comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Rideaucrest - Davidson Heights faces
What to do about the hazards Rideaucrest - Davidson Heights 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.
- Drop, cover and hold on.
- Strap the water heater down.
- Keep 72 hours of supplies.
- Has it had a radon test?
- Check the address on the flood map.
- Are flood and wildfire insured?
- Is earthquake cover included?
What this data can and can’t tell you
- Flood studies aren’t flood zones. NRCan’s inventory says where flood mapping exists, not where water goes; the map’s owner is the authority for Rideaucrest - Davidson Heights.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Rideaucrest - Davidson Heights’ homes since 1986, a history of fire that may lower Risk but never raises it.
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Rideaucrest - Davidson Heights is its health region’s, the survey’s design unit.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Rideaucrest - Davidson Heights’ figure is its subdivision’s.
Questions about flooding and hazards in Rideaucrest - Davidson Heights
How big is the earthquake risk in Rideaucrest - Davidson Heights?
In NRCan’s seismic model, Rideaucrest - Davidson Heights’ buildings lose $0.15 per $1,000 of value in an average year.
Does Rideaucrest - Davidson Heights flood?
There is flood mapping for Rideaucrest - Davidson Heights on the national inventory, each study linked to its owner’s map, none of them graded.
Is Rideaucrest - Davidson Heights at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Rideaucrest - Davidson Heights since 1986, a low band, though small grass fires aren’t mapped.
Is radon a problem in Rideaucrest - Davidson Heights?
Around Rideaucrest - Davidson Heights, 64 survey homes were tested and 6.2% came in over 200 Bq/m³, a guide to the area, not to any one home.
How is Rideaucrest - Davidson Heights’s Hazard risk Grade worked out?
Rideaucrest - Davidson Heights’ Hazard risk grade is C+, built on earthquakes and radon with a one-sided wildfire input.
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).