Hazards in Trillium: wildfire low, radon over the guideline in 5% of tested homes
Wildfire barely registers for Trillium, at 0% of the land within 25 km since 1986 (0.000% a year). Earthquake risk in Trillium is ordinary: NRCan’s model puts building losses at $0.044 a year per $1,000 of value, close to the typical town’s $0.030. Trillium grades B+ for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Trillium’s hazards
Four national sources, each read for Trillium: earthquakes, radon, past fires and flood studies.
What Trillium faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Trillium: B+
Seismic risk and radon set Trillium’s grade, wildfire can drag it down, and flood mapping stays out of it.
Its place: #494 of 866 in Ontario and #1,255 of 2,589 Canadian towns.
How sure: The seismic figure is a long-run average from NRCan’s model, not a prediction. Small fires and grass fires are largely missing from the national burned-area record.
Wildfire is rare near Trillium: 0% of the land within 25 km burned since 1986, 0% within 5 km
Fires mapped since 1986 around where Trillium’s residents live, and the fuel next to their homes.
The land within 25 km of Trillium burns at 0.000% a year on average, the low band; the typical Canadian town: 0.000%.
Around Trillium the forest is thin or far off: 0.3% of the land within 5 km and 0.4% within 25 km is forest fuel.
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
Near-zero burning puts Trillium with 638 of the 871 towns in Ontario, far below Sioux Lookout 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.
Only 7.5% of Canada’s 2,610 towns are above the low band, which holds 92%; Trillium, 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.
The flood map inventory lists nothing for Trillium
Flood studies whose area touches Trillium, from NRCan’s inventory, each linked to its owner.
There is no study for Trillium on the national flood inventory, which is far from complete.
Towns with a flood study on file
Flood maps are common in Ontario, 69% of towns against 58% nationally, but none in the inventory touches Trillium.
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 Trillium’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.”
Expected shaking damage in Trillium: $0.044 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.
With $0.044 of shaking damage a year per $1,000, Trillium is about even with the typical $0.030 (1.5 times).
Figures for earthquake risk are published for the city of Hamilton as a whole, not for Trillium alone.
Shaking damage a year per $1,000 of building value
About level with the typical town in Ontario: Trillium’s $0.044 against $0.043; 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.
Trillium sits above most of Canada’s 2,611 towns on earthquake risk; 32% 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).
Roads, pipes and bridges aren’t in Trillium’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 Trillium: 5% of area homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline. · The radon tests numbers here cover the City of Hamilton Health Unit
At 5% over the guideline, the area around Trillium is about level with the typical Canadian town’s 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
More homes top the guideline around Trillium (5%) than in the typical town in Ontario (4%).
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 Trillium’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 Trillium only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Trillium
Environment and Climate Change Canada issues the weather alerts for Trillium; 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. |
Smoke and fire warnings for Trillium come through Environment Canada and Alert Ready; the fire map is CWFIS’s.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Trillium
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Trillium | Low | $0.044 | 5% | None listed |
| Industrial 6,690 · 2.1 km | Low | $0.044 | 5% | Yes |
| Westmeria 2,646 · 2.5 km | Low | $0.044 | 5% | None listed |
| Guernsey 3,808 · 2.9 km | Low | $0.044 | 5% | None listed |
| Lakeshore 3,127 · 3.5 km | Low | $0.044 | 5% | None listed |
| Fifty Point 3,690 · 3.9 km | Low | $0.044 | 5% | Yes |
| Highway Valley 4,469 · 4.0 km | Low | $0.044 | 5% | None listed |
The neighbour with the most fire is Industrial (low), still no more than Trillium (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Trillium faces
Practical steps for Trillium’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.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- Has it had a radon test?
- Ask the municipality for flood maps.
- Are flood and wildfire insured?
What this data can and can’t tell you
- Radon is a survey. The radon share comes from about 14,000 long-term home tests in 2009–2011, pooled for now by the 2007 health region Trillium sits in.
- Flood studies aren’t flood zones. A study’s area can be a whole watershed or province, so being on the inventory says a map exists, not that a home in Trillium floods.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Trillium’s figure is its subdivision’s.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Trillium’s homes since 1986, a history of fire that may lower Risk but never raises it.
Questions about flooding and hazards in Trillium
Does Trillium flood?
The inventory has 0 studies for Trillium, and an empty list isn’t a clean bill: the municipality holds any flood maps.
How is Trillium’s Hazard risk Grade worked out?
Hazard risk gives Trillium B+, weighing earthquakes and radon and counting wildfire only against it.
Is radon a problem in Trillium?
The area’s survey found 5% of 100 tested homes above Health Canada’s guideline, so a three-month test is worth doing in Trillium.
Is Trillium at risk of wildfire?
The burned-area record shows next to nothing around Trillium (0% within 25 km since 1986), so its band is low.
How big is the earthquake risk in Trillium?
Expected earthquake damage in Trillium comes to $0.044 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).