Photo: Steffen Sledz ( Zone42 ) · CC BY-SA 3.0Hazard risk in One Hundred Mile House is higher than in 96% of Canadian towns
Fire is a regular visitor: 14% of the land within 25 km of One Hundred Mile House has burned since 1986 (0.35% a year). Seismic risk runs low: $0.013 of expected damage per $1,000 of buildings a year, the typical town $0.030. In Health Canada’s survey, 6.4% of homes tested in One Hundred Mile House’s area exceeded 200 Bq/m³, close to the typical 6.6%. Hazard risk gives One Hundred Mile House a grade of D−; its wildfire band pulls it down.
What stands out about One Hundred Mile House’s hazards
Four national sources, each read for One Hundred Mile House: earthquakes, radon, past fires and flood studies.
What One Hundred Mile House faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
One Hundred Mile House grades D− for hazard risk
Seismic risk and radon set One Hundred Mile House’s grade, wildfire can drag it down, and flood mapping stays out of it.
How sure: Earthquake losses are a model’s expectation over many years, not a forecast for any one. Small fires and grass fires are largely missing from the national burned-area record.
A high wildfire band for One Hundred Mile House: 7.2% within 5 km, 14% within 25 km
Fires mapped since 1986 around where One Hundred Mile House’s residents live, and the fuel next to their homes.
High: the land around One Hundred Mile House burns at 0.35% a year, where the typical Canadian town sees 0.000%.
Within 5 km of One Hundred Mile House, 58% of the land is forest fuel; widen the ring to 25 km and it is 68%.
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 256
The land around One Hundred Mile House burns at 0.35% a year, the 21st highest rate of 256 towns in British Columbia; Oliver tops it at 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.
One Hundred Mile House is one of the few of Canada’s 2,610 towns in the high band (1.9%); 0.2% rank very high.
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.
One Hundred Mile House is on the flood map inventory: 2 studies, latest by Fraser Basin Council
Flood studies whose area touches One Hundred Mile House, from NRCan’s inventory, each linked to its owner.
The newest of 2 studies covering One Hundred Mile House is Fraser Basin Council’s, from 2021; open its map to see the zones.
| Study | By | Year | Status |
|---|---|---|---|
| Cariboo Regional District Flood Hazard Assessment | Fraser Basin Council | 2021 | final |
| Thompson River Watershed Base Level Flood Hazard Mapping | Fraser Basin Council | 2020 | final |
Towns with a flood study on file
Flood maps are common in British Columbia: 76% of towns have one, against 58% nationally, and One Hundred Mile House is among them.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Flood studies don’t enter the grade; they are listed so you can open the official map for One Hundred Mile House.
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.
Little shaking expected in One Hundred Mile House: $0.013 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.
At $0.013 per $1,000, One Hundred Mile House carries 0.4 times the typical Canadian town’s earthquake risk ($0.030): low.
Shaking damage a year per $1,000 of building value
Below the middle in British Columbia: One Hundred Mile House’s $0.013 against a median of $0.36; Duncan has $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.
Toward the quiet end of Canada’s range: 75% of its 2,611 towns sit above One Hundred Mile House.
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 One Hundred Mile House’s 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).
Some radon around One Hundred Mile House: 6.4% of area homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · Area-wide: radon tests, counted over the Thompson/Cariboo health region
Around One Hundred Mile House, 6.4% of tested homes topped the guideline, near the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Radon runs higher around One Hundred Mile House than in most towns in British Columbia: 6.4% against 1.8%.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Between 5% and 10% of tests over the guideline: One Hundred Mile House, and 37% of Canada’s 2,611 towns; 26% are 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.
The survey sampled homes around One Hundred Mile House; 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 One Hundred Mile House
Alerts for One Hundred Mile House 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 One Hundred Mile House to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How One Hundred Mile House’s neighbours compare on hazards
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| One Hundred Mile House | High | $0.013 | 6.4% | Yes |
| Mile 108 Recreational Ranch 5,887 · 12 km | High | $0.020 | 6.4% | Yes |
| Electoral Area L, Cariboo 5,358 · 13 km | High | $0.022 | 6.4% | Yes |
The fire record around Electoral Area L, Cariboo is a touch heavier than One Hundred Mile House’s, 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 One Hundred Mile House faces
Practical steps for One Hundred Mile House’s hazards, most pressing first.
- 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
- 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 One Hundred Mile House.
- Wildfire counts one way. Wildfire is read from the national burned-area record around One Hundred Mile House’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; One Hundred Mile House’s figure is its subdivision’s.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, One Hundred Mile House takes its 2007 health region’s share.
Questions about flooding and hazards in One Hundred Mile House
Does One Hundred Mile House flood?
The inventory lists a study touching One Hundred Mile House; whether a given street floods is on that map, not in the grade.
Is One Hundred Mile House at risk of wildfire?
It is: 14% of the land within 25 km of One Hundred Mile House has burned since 1986, the latest in 2025, which puts it in the high band that lowers Risk.
How big is the earthquake risk in One Hundred Mile House?
Expected earthquake damage in One Hundred Mile House comes to $0.013 a year for each $1,000 that buildings are worth.
How is One Hundred Mile House’s Hazard risk Grade worked out?
One Hundred Mile House’s Hazard risk grade is D−, built on earthquakes and radon with a one-sided wildfire input.
Is radon a problem in One Hundred Mile House?
6.4% of the 109 homes Health Canada tested around One Hundred Mile House topped the guideline; your own house needs its own test.
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).