Photo: P199 · Public domainFlood mapping exists for Tyendinaga: 1 on record, latest by Quinte Conservation
Since 1986 almost nothing has burned near Tyendinaga: 0% of the land within 25 km, or 0.000% a year. NRCan expects $0.041 of shaking damage a year per $1,000 of buildings in Tyendinaga, near the typical $0.030. Radon is higher than usual: 12% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Tyendinaga grades C for hazard risk; wildfire is low here, so it earns no credit.
What stands out about Tyendinaga’s hazards
Four national sources, each read for Tyendinaga: earthquakes, radon, past fires and flood studies.
What Tyendinaga faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Tyendinaga: C
The grade weighs Tyendinaga’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: #843 of 866 in Ontario and #2,092 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 Tyendinaga has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Tyendinaga’s residents live, and the fuel next to their homes.
Around Tyendinaga fire takes 0.000% of the land in a typical year, the typical Canadian town 0.000%, which is low.
The ring nearest Tyendinaga is the most wooded: 27% forest fuel within 5 km against 17% 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
Of the 871 towns in Ontario, 638 have a burn rate that rounds to zero, Tyendinaga among them; Sioux Lookout leads at 0.16% a year.
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.
Like most of Canada’s 2,610 towns (92%), Tyendinaga is in the low band, with a burn rate of zero to three decimals; 7.5% rank higher.
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.
Quinte Conservation has mapped flooding for Tyendinaga (1 study)
Flood studies whose area touches Tyendinaga, from NRCan’s inventory, each linked to its owner.
Quinte Conservation studied flooding in an area that includes Tyendinaga (2024); open its map to see which streets lie in a flood zone.
| Study | By | Year | Status |
|---|---|---|---|
| Selby Creek | Quinte Conservation | 2024 | under review |
Towns with a flood study on file
Its flood study puts Tyendinaga with 69% of towns in Ontario; Canada’s share 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 Tyendinaga.
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.
Expected shaking damage in Tyendinaga: $0.041 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 $0.041 of shaking damage a year per $1,000, Tyendinaga is about even with the typical $0.030 (1.4 times).
Shaking damage a year per $1,000 of building value
Shaking damage around Tyendinaga runs at $0.041 a year, near the $0.043 of the typical town in Ontario; Alexandria has $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.
Middle of the pack: 43% of Canada’s 2,611 towns have more earthquake risk than Tyendinaga.
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 Tyendinaga’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).
Radon runs high around Tyendinaga: 12% of tested homes over the guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
More homes than usual test high around Tyendinaga: 12% against 6.6% for the typical Canadian town. Figures for radon tests are published for the Hastings and Prince Edward Counties Health Unit as a whole, not for Tyendinaga alone.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Tyendinaga, 12% of tests were over 200 Bq/m³ and 2% 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.
One test in ten or more tops the guideline around Tyendinaga, as in 22% of Canada’s 2,611 towns; 4.6% go 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 share describes the area, not a house: in Tyendinaga as anywhere, test to be sure.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Weather and fire alerts for Tyendinaga
Alerts for Tyendinaga 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. |
Fire danger and active fires near Tyendinaga are mapped daily by the Canadian Wildland Fire Information System; evacuation orders come from the municipality or province.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Tyendinaga
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Tyendinaga | Low | $0.041 | 12% | Yes |
| Tyendinaga Mohawk Territory 3,028 · 12 km | Low | $0.043 | 12% | Yes |
| Deseronto 1,844 · 14 km | Low | $0.035 | 12% | Yes |
| Greater Napanee 18,016 · 17 km | Low | $0.042 | 11% | Yes |
Nowhere around Tyendinaga burns more: Tyendinaga Mohawk Territory, the closest rival, is low to its low.
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Tyendinaga faces
What to do about the hazards Tyendinaga 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. The wildfire figure is the share of land within 25 km of Tyendinaga’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
- 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 Tyendinaga.
- Earthquakes are modelled. Shaking damage is modelled from the ground, the buildings and the odds of each quake, and published for whole subdivisions such as Tyendinaga’s.
- Radon is a survey. Health Canada’s survey tested some 14,000 homes over three months; until postal-area boundaries are loaded, Tyendinaga takes its 2007 health region’s share.
Questions about flooding and hazards in Tyendinaga
How is Tyendinaga’s Hazard risk Grade worked out?
Tyendinaga grades C for hazard risk, from earthquakes and radon, with wildfire counted only where it lowers the grade.
Does Tyendinaga flood?
The inventory lists a study touching Tyendinaga; whether a given street floods is on that map, not in the grade.
How big is the earthquake risk in Tyendinaga?
About $0.041 a year per $1,000 of building value, NRCan’s long-run expectation for Tyendinaga.
Is Tyendinaga at risk of wildfire?
The burned-area record shows next to nothing around Tyendinaga (0% within 25 km since 1986), so its band is low.
Is radon a problem in Tyendinaga?
In Health Canada’s survey, 12% of 99 homes tested in Tyendinaga’s area were above 200 Bq/m³, though only a test tells you about one house.
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).