Photo: P199 · CC BY-SA 3.0A flood study covers Navan - Sarsfield: 3 on the national inventory, the newest from South Nation Conservation
The burned-area map is nearly blank around Navan - Sarsfield, 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. In Health Canada’s survey, 6.2% of homes tested in Navan - Sarsfield’s area exceeded 200 Bq/m³, close to the typical 6.6%. Hazard risk gives Navan - Sarsfield a grade of C+, from earthquakes and radon alone.
What stands out about Navan - Sarsfield’s hazards
Four national sources, each read for Navan - Sarsfield: earthquakes, radon, past fires and flood studies.
What Navan - Sarsfield faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Navan - Sarsfield grades C+ for hazard risk
Earthquake risk and radon make Navan - Sarsfield’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. Small fires and grass fires are largely missing from the national burned-area record.
Little of the land around Navan - Sarsfield has burned: 0% within 5 km, 0% within 25 km since 1986
Past fire around Navan - Sarsfield’s homes, from the national burned-area record, with the fuel within 5 km.
Forty years of fire maps put Navan - Sarsfield at 0.000% a year, low next to the typical Canadian town’s 0.000%.
Fire has stayed at least 20 km from Navan - Sarsfield’s homes since 1986.
The forest starts beyond town: 2.5% of the land within 5 km of Navan - Sarsfield’s homes is forest fuel, against 7.7% 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
To three decimals the burn rate around Navan - Sarsfield is zero, as for 638 of the 871 towns in Ontario, while Sioux Lookout reaches 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.
Only 7.5% of Canada’s 2,610 towns are above the low band, which holds 92%; Navan - Sarsfield, 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.
Navan - Sarsfield is on the flood map inventory: 3 studies, latest by South Nation Conservation
What Canada’s Flood Map Inventory lists for Navan - Sarsfield: who studied flooding and where to see their maps.
3 studies on the inventory touch Navan - Sarsfield, the newest South Nation Conservation’s from 2024, and their areas can be large, so they say maps exist, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| Bear Brook Flood Mapping | South Nation Conservation | 2024 | under review · not public |
| Becketts Creek | Rideau Valley Conservation Authority | 2018 | final |
| Cardinal Creek | Rideau Valley Conservation Authority | 2014 | final |
Towns with a flood study on file
Mapping in Ontario reaches 69% of towns, Navan - Sarsfield included, beside 58% across Canada.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
The busiest decade for flood studies around Navan - Sarsfield was the 2010s (2 of 3); they run from the 2010s to the 2020s.
Study dates as the NRCan inventory lists them, one count per study touching Navan - Sarsfield.
Flood mapping is shown for Navan - Sarsfield 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 Navan - Sarsfield $0.15 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Navan - Sarsfield’s $0.15 is about 5 times the typical town’s $0.030: it sits in one of Canada’s more active seismic zones.
Shaking damage a year per $1,000 of building value
The typical town in Ontario expects $0.043 a year; Navan - Sarsfield 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.
Navan - Sarsfield 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).
The loss is to Navan - Sarsfield’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). · Earthquake risk published for the city of Ottawa, not by town
Some radon around Navan - Sarsfield: 6.2% of area homes over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline.
6.2% of tested homes around Navan - Sarsfield were over the guideline, much like the typical Canadian town at 6.6%. Navan - Sarsfield shares its radon tests numbers with the rest of the City of Ottawa Health Unit.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
The median in Ontario is 4% over 200 Bq/m³; the survey area around Navan - Sarsfield has 6.2%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
37% of Canada’s 2,611 towns share Navan - Sarsfield’s band of 5 to 10%; 26% 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.
Basements, soil and how a house is sealed decide its radon, so in Navan - Sarsfield only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Navan - Sarsfield
Alerts for Navan - Sarsfield 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 Navan - Sarsfield to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Navan - Sarsfield’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 |
|---|---|---|---|---|
| Navan - Sarsfield | Low | $0.15 | 6.2% | Yes |
| Portobello South 29,960 · 5.8 km | Low | $0.15 | 6.2% | Yes |
| Cardinal Creek 11,676 · 7.8 km | Low | $0.15 | 6.2% | Yes |
| Fallingbrook 17,836 · 8.3 km | Low | $0.15 | 6.2% | Yes |
| Chapel Hill South 14,278 · 8.4 km | Low | $0.15 | 6.2% | None listed |
| Vars 2,767 · 8.5 km | Low | $0.15 | 6.2% | Yes |
| Queenswood Heights 8,998 · 8.8 km | Low | $0.15 | 6.2% | Yes |
Nowhere around Navan - Sarsfield burns more: Portobello South, the closest rival, is low to its low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Navan - Sarsfield faces
Practical steps for Navan - Sarsfield’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?
- 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
- Wildfire counts one way. Wildfire is read from the national burned-area record around Navan - Sarsfield’s homes since 1986, a history of fire that may lower Risk but never raises it.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Navan - Sarsfield’s figure is its subdivision’s.
- 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 Navan - Sarsfield.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Navan - Sarsfield takes its 2007 health region’s share.
Questions about flooding and hazards in Navan - Sarsfield
How big is the earthquake risk in Navan - Sarsfield?
NRCan’s model expects shaking to cost buildings in Navan - Sarsfield $0.15 a year for every $1,000 of their value, on average over many years.
Is Navan - Sarsfield at risk of wildfire?
Not much by Canadian standards: Navan - Sarsfield’s band is low, with 0% of the land within 25 km burned since 1986 (last in 2025), so wildfire doesn’t change its grade.
Is radon a problem in Navan - Sarsfield?
6.2% of the 64 homes Health Canada tested around Navan - Sarsfield topped the guideline; your own house needs its own test.
How is Navan - Sarsfield’s Hazard risk Grade worked out?
Hazard risk gives Navan - Sarsfield C+, weighing earthquakes and radon and counting wildfire only against it.
Does Navan - Sarsfield flood?
The inventory lists a study touching Navan - Sarsfield; whether a given street floods is on that map, not in the grade.
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).