Flood mapping exists for Trinity: 2 on record, latest by Hamilton Conservation Authority
Fire has left almost no mark near Trinity: 0% of the land within 25 km since 1986, 0.000% a year. Earthquake risk in Trinity 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. Radon is about average around Trinity: 5% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Hazard risk gives Trinity a grade of B+, from earthquakes and radon alone.
What stands out about Trinity’s hazards
For Trinity, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Trinity faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Trinity: B+
The grade weighs Trinity’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
Its place: #494 of 866 in Ontario and #1,255 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.
Wildfire is rare near Trinity: 0% of the land within 25 km burned since 1986, 0% within 5 km
Fires mapped since 1986 around where Trinity’s residents live, and the fuel next to their homes.
Next to the typical Canadian town (0.000% a year), Trinity’s 0.000% is in the low band.
Around Trinity the forest is thin or far off: 0.3% of the land within 5 km and 1% 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
To three decimals the burn rate around Trinity 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.
92% of Canada’s 2,610 towns are in the low band and 7.5% above it; Trinity is among the many where the yearly burn rate rounds to zero.
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.
Trinity is on the flood map inventory: 2 studies, latest by Hamilton Conservation Authority
Flood studies whose area touches Trinity, from NRCan’s inventory, each linked to its owner.
Hamilton Conservation Authority and others have studied flooding in areas that include Trinity: 2 studies, the latest from 2025.
| Study | By | Year | Status |
|---|---|---|---|
| Red Hill Creek | Hamilton Conservation Authority | 2025 | final |
| Grand River Regulatory Floodplain | Grand River Conservation Authority | 2018 | final |
Towns with a flood study on file
69% of towns in Ontario have a flood study, more than Canada’s 58%; Trinity has one too.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
The 2 studies touching Trinity are spread over time, from the 2010s to the 2020s.
Study dates as the NRCan inventory lists them, one count per study touching Trinity.
Nothing here counts toward Risk; the studies are pointers to the maps their owners keep for Trinity.
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 Trinity: $0.044 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.
Earthquake losses in Trinity, $0.044 per $1,000, are in line with the typical $0.030 (1.5 times).
Trinity doesn’t get its own earthquake risk figures; the ones here come from the city of Hamilton.
Shaking damage a year per $1,000 of building value
About level with the typical town in Ontario: Trinity’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.
Trinity 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).
Only shaking damage to buildings in Trinity is counted; landslides, liquefaction, tsunami and fire after a quake aren’t.
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 Trinity: 5% of area homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
At 5% over the guideline, the area around Trinity is about level with the typical Canadian town’s 6.6%. Figures for radon tests are published for the City of Hamilton Health Unit as a whole, not for Trinity alone.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Trinity’s area, at 5%, is above the median in Ontario (4%).
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Trinity is in the 5–10% band with 37% of Canada’s 2,611 towns; 26% have more.
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.
Radon varies from house to house in Trinity, so the survey is a reason to test, not a result for yours.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Trinity
Environment and Climate Change Canada issues the weather alerts for Trinity; 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. |
For fires near Trinity, the national fire information system maps danger and active fires daily; local authorities give any evacuation order.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Trinity
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Trinity | Low | $0.044 | 5% | Yes |
| Valley Park 6,394 · 1.4 km | Low | $0.044 | 5% | Yes |
| Albion 4,585 · 2.4 km | Low | $0.044 | 5% | Yes |
| Highland 6,306 · 2.5 km | Low | $0.044 | 5% | Yes |
| Felker 4,534 · 2.8 km | Low | $0.044 | 5% | Yes |
| Templemead 4,188 · 3.1 km | Low | $0.044 | 5% | Yes |
| Lisgar 3,945 · 3.2 km | Low | $0.044 | 5% | Yes |
Fire is no heavier anywhere nearby than around Trinity (low), with Valley Park next at low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Trinity faces
What to do about the hazards Trinity 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.
- Clear needles and wood nearby.
- Keep a grab-and-go bag ready.
- In smoke, stay in; filter air.
- Has it had a radon test?
- Check the address on the flood map.
- 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 Trinity.
- Earthquakes are modelled. The earthquake figure is an expected loss, not a forecast, worked out by NRCan for each census subdivision, Trinity’s included.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Trinity takes its 2007 health region’s share.
- 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 Trinity.
Questions about flooding and hazards in Trinity
Is Trinity at risk of wildfire?
No meaningful wildfire history near Trinity: 0% of nearby land since 1986, band low.
Does Trinity flood?
The inventory lists a study touching Trinity; whether a given street floods is on that map, not in the grade.
Is radon a problem in Trinity?
In Health Canada’s survey, 5% of 100 homes tested in Trinity’s area were above 200 Bq/m³, though only a test tells you about one house.
How is Trinity’s Hazard risk Grade worked out?
Trinity grades B+ for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
How big is the earthquake risk in Trinity?
Expected earthquake damage in Trinity 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).