Photo: P199 · CC BY-SA 3.0Alnwick/Haldimand is on Canada’s flood inventory: 3 listed, led by Lower Trent Region Conservation Authority
For Alnwick/Haldimand, wildfire history is close to nil: 0% of nearby land since 1986, 0.000% a year. Shaking is about as much of a worry in Alnwick/Haldimand as in most places, at $0.026 a year per $1,000 of building value ($0.030 typical). In Health Canada’s survey, 6.1% of homes tested in Alnwick/Haldimand’s area exceeded 200 Bq/m³, close to the typical 6.6%. Alnwick/Haldimand grades A− for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Alnwick/Haldimand’s hazards
Four national sources, each read for Alnwick/Haldimand: earthquakes, radon, past fires and flood studies.
What Alnwick/Haldimand faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Alnwick/Haldimand: A−
Risk averages earthquakes and radon; wildfire joins only where it pulls the average down, so a town like Alnwick/Haldimand with little fire nearby would get no credit for it.
Its place: #450 of 866 in Ontario and #881 of 2,589 Canadian towns.
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.
Little of the land around Alnwick/Haldimand has burned: 0% within 5 km, 0% within 25 km since 1986
Past fire around Alnwick/Haldimand’s homes, from the national burned-area record, with the fuel within 5 km.
Next to the typical Canadian town (0.000% a year), Alnwick/Haldimand’s 0.000% is in the low band.
The ring nearest Alnwick/Haldimand is the most wooded: 19% forest fuel within 5 km against 12% 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
Fire has taken almost none of the land around Alnwick/Haldimand, as for 638 of the 871 towns in Ontario; Sioux Lookout tops the list 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.
Alnwick/Haldimand shares the low band with 92% of Canada’s 2,610 towns, its burn rate rounding to nothing; 7.5% 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.
Flooding around Alnwick/Haldimand is mapped in 3 studies, the newest by Lower Trent Region Conservation Authority
What Canada’s Flood Map Inventory lists for Alnwick/Haldimand: who studied flooding and where to see their maps.
3 studies on the inventory touch Alnwick/Haldimand, the newest Lower Trent Region Conservation Authority’s from 2024, and their areas can be large, so they say maps exist, not that the town floods.
| Study | By | Year | Status |
|---|---|---|---|
| Lower Trent River | Lower Trent Region Conservation Authority | 2024 | final |
| Colborne Creek | Lower Trent Region Conservation Authority | 2024 | final |
| Lake Ontario Shoreline Management Plan | Ganaraska Region Conservation Authority | 2020 | final |
Towns with a flood study on file
Alnwick/Haldimand is one of the 69% of towns in Ontario with a flood study on file; across Canada it is 58%.
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 Alnwick/Haldimand.
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 Alnwick/Haldimand $0.026 per $1,000 a year
Expected yearly building losses from earthquakes, from Natural Resources Canada’s model.
Alnwick/Haldimand’s $0.026 is close to the typical town’s $0.030 (0.9 times as much).
Shaking damage a year per $1,000 of building value
Earthquake risk in Ontario peaks in Alexandria ($0.21); Alnwick/Haldimand, at $0.026, is below the median of $0.043.
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: 53% of the 2,611 towns expect more damage than Alnwick/Haldimand.
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 model counts damage to Alnwick/Haldimand’s buildings and their occupants from shaking only: not liquefaction, landslides, tsunami or fires after a quake.
Natural Resources Canada, Canada’s Seismic Risk Model (2022), by census subdivision (2016 boundaries; a few 2021 subdivisions take their residents’ mean).
Radon about average around Alnwick/Haldimand: 6.1% over the guideline
Long-term radon tests in homes across the survey area, against Health Canada’s guideline. · Measured across the Haliburton, Kawartha, Pine Ridge District Heal health region: radon tests
Alnwick/Haldimand’s area sits close to the typical Canadian town: 6.1% over the guideline, against 6.6%.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Alnwick/Haldimand, 6.1% of tests were over 200 Bq/m³ and 1% over 600, against a median of 4% in Ontario.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
Alnwick/Haldimand 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.
The share describes the area, not a house: in Alnwick/Haldimand as anywhere, test to be sure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Alnwick/Haldimand
Alerts for Alnwick/Haldimand 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 Alnwick/Haldimand to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
How Alnwick/Haldimand’s neighbours compare on hazards
Wildfire band, earthquake risk, radon and flood studies for each place nearby.
None of the places around has more fire nearby than Alnwick/Haldimand (low); Hamilton comes closest (low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Alnwick/Haldimand faces
What to do about the hazards Alnwick/Haldimand 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
- Flood studies aren’t flood zones. NRCan’s inventory says where flood mapping exists, not where water goes; the map’s owner is the authority for Alnwick/Haldimand.
- Earthquakes are modelled. NRCan models what earthquakes would cost buildings each year on average, subdivision by subdivision; Alnwick/Haldimand’s figure is its subdivision’s.
- Wildfire counts one way. Wildfire is read from the national burned-area record around Alnwick/Haldimand’s homes since 1986, a history of fire that may lower Risk but never raises it.
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Alnwick/Haldimand is its health region’s, the survey’s design unit.
Questions about flooding and hazards in Alnwick/Haldimand
How is Alnwick/Haldimand’s Hazard risk Grade worked out?
Hazard risk gives Alnwick/Haldimand A−, weighing earthquakes and radon and counting wildfire only against it.
How big is the earthquake risk in Alnwick/Haldimand?
NRCan’s model expects shaking to cost buildings in Alnwick/Haldimand $0.026 a year for every $1,000 of their value, on average over many years.
Does Alnwick/Haldimand flood?
There is flood mapping for Alnwick/Haldimand on the national inventory, each study linked to its owner’s map, none of them graded.
Is Alnwick/Haldimand at risk of wildfire?
Hardly at all on record: 0% of the land within 25 km of Alnwick/Haldimand since 1986, a low band, though small grass fires aren’t mapped.
Is radon a problem in Alnwick/Haldimand?
Around Alnwick/Haldimand, 98 survey homes were tested and 6.1% came in over 200 Bq/m³, a guide to the area, not to any one home.
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).