Photo: GoToVan from Vancouver, Canada · CC BY 2.0Hazard risk in Osoyoos is higher than in almost every Canadian town
Wildfire is a real hazard for Osoyoos: 36% of the land within 25 km has burned since 1986, 0.96% a year, in the high band. Seismic risk in Osoyoos sits near the middle: $0.030 of expected damage per $1,000 of buildings a year, the typical town $0.030. Radon is higher than usual: 17% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Osoyoos grades D− for hazard risk, with wildfire counted against it.
What stands out about Osoyoos’s hazards
For Osoyoos, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Osoyoos faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Osoyoos: D−
Two inputs always count for Osoyoos, earthquakes and radon; the third, wildfire, counts only against a town.
Its place: #2,582 of 2,589 Canadian towns.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. The burned-area record misses fires under about 10 ha and most grass and farm fires.
A high wildfire band for Osoyoos: 52% within 5 km, 36% within 25 km
Fires mapped since 1986 around where Osoyoos’ residents live, and the fuel next to their homes.
The yearly burn rate around Osoyoos is 0.96%, against 0.000% for the typical Canadian town: the high band.
Homes in Osoyoos sit on open or built-up ground (4.6% forest fuel within 5 km); the wider 25 km holds 35%.
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 British Columbia · highest of 255
At 0.96% a year, Osoyoos is near the top in British Columbia: 2nd of 255, behind Oliver (0.98%).
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.
Just 1.9% of Canada’s 2,610 towns burn fast enough for the high band where Osoyoos sits; 0.2% 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.
Osoyoos is on the flood map inventory: 1 study, by Okanagan Basin Water Board
Flood studies whose area touches Osoyoos, from NRCan’s inventory, each linked to its owner.
A 2020 study by Okanagan Basin Water Board covers Osoyoos, and its map, not the inventory, shows the zones.
| Study | By | Year | Status |
|---|---|---|---|
| Okanagan Mainstem Floodplain Mapping Project | Okanagan Basin Water Board | 2020 | final |
Towns with a flood study on file
Mapping in British Columbia reaches 76% of towns, Osoyoos 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 grade leaves flood out, since a study area says nothing about how many of Osoyoos’ homes are at risk.
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.
Ordinary seismic risk in Osoyoos: $0.030 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.
Osoyoos’ $0.030 matches the typical town’s $0.030.
Shaking damage a year per $1,000 of building value
The typical town in British Columbia expects $0.36 a year in shaking damage; Osoyoos expects less, $0.030, and Duncan the most, $1.33.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Neither high nor low for Canada: 48% of the 2,611 towns expect more damage than Osoyoos.
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 Osoyoos 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).
Radon runs high around Osoyoos: 17% of tested homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
the typical Canadian town has 6.6% over the guideline; Osoyoos’ area has 17%. Osoyoos shares its radon tests numbers with the rest of the Okanagan health region.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Osoyoos’ area, at 17%, is above the median in British Columbia (1.8%), and 2.8% of its tests passed 600 Bq/m³.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
More high tests than most: Osoyoos sits in a band that only 22% of Canada’s 2,611 towns share, with 4.6% 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.
Neighbouring homes in Osoyoos can differ a lot; only a long-term test tells you about yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Osoyoos
Environment and Climate Change Canada issues the weather alerts for Osoyoos; 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 Osoyoos, and listen to local authorities for orders.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Osoyoos’ neighbours compare on hazards
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Osoyoos | High | $0.030 | 17% | Yes |
| Electoral Area A, Okanagan-Similkameen 2,429 · 1.7 km | High | $0.018 | 17% | Yes |
| Osoyoos 1 1,484 · 16 km | High | $0.022 | 17% | Yes |
| Oliver 5,262 · 19 km | High | $0.028 | 17% | Yes |
The fire record around Oliver is a touch heavier than Osoyoos’, but the band is the same: high (here high).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Osoyoos faces
What to do about the hazards Osoyoos faces, and what to ask before you buy.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- 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.
- Has it had a radon test?
- Check the address on the flood map.
- How close is the forest edge?
- Are flood and wildfire insured?
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 Osoyoos.
- 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 Osoyoos.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Osoyoos takes its 2007 health region’s share.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Osoyoos’ included.
Questions about flooding and hazards in Osoyoos
Does Osoyoos flood?
The inventory lists a study touching Osoyoos; whether a given street floods is on that map, not in the grade.
Is radon a problem in Osoyoos?
In Health Canada’s survey, 17% of 109 homes tested in Osoyoos’ area were above 200 Bq/m³, though only a test tells you about one house.
How is Osoyoos’s Hazard risk Grade worked out?
Hazard risk gives Osoyoos D−, weighing earthquakes and radon and counting wildfire only against it.
Is Osoyoos at risk of wildfire?
Yes, by Canadian standards: Osoyoos’ band is high, with 36% of the land within 25 km burned since 1986 (last in 2025), so wildfire counts against its Risk grade.
How big is the earthquake risk in Osoyoos?
Expected earthquake damage in Osoyoos comes to $0.030 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).