Photo: Shamus7792003 · CC BY-SA 3.0Around Dieppe, 20% of tested homes have radon above the guideline
Wildfire is rare near Dieppe: 0.1% of the land within 25 km has burned since 1986, a burn rate of 0.001% a year. Earthquake risk in Dieppe is ordinary: NRCan’s model puts building losses at $0.033 a year per $1,000 of value, close to the typical town’s $0.030. Hazard risk gives Dieppe a grade of C−, from earthquakes and radon alone.
What stands out about Dieppe’s hazards
Four national sources, each read for Dieppe: earthquakes, radon, past fires and flood studies.
What Dieppe faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Dieppe grades C− for hazard risk
Earthquake risk and radon make Dieppe’s grade; wildfire can only lower it, never raise it, and flood studies are listed but not scored.
Its place: #25 of 60 in New Brunswick and #2,323 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.
Little of the land around Dieppe has burned: 0.4% within 5 km, 0.1% within 25 km since 1986
Fires mapped since 1986 around where Dieppe’s residents live, and the fuel next to their homes.
A burn rate of 0.001% a year keeps Dieppe in the low band (the typical Canadian town: 0.000%).
Forest fuel covers 44% of the land close to Dieppe and 69% across 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 New Brunswick · highest of 60
In the lower half in New Brunswick: Dieppe at 0.001% a year, 42nd of 60, far from Tracadie’s 0.28%.
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.
7.5% of Canada’s 2,610 towns burn fast enough to rank moderate or above; Dieppe stays low, with 92%.
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.
Dieppe is on the flood map inventory: 1 study, by Service New Brunswick - GeoNB
Flood studies whose area touches Dieppe, from NRCan’s inventory, each linked to its owner.
For Dieppe the inventory points to Service New Brunswick - GeoNB’s 2020 study, whose map is the one to check.
| Study | By | Year | Status |
|---|---|---|---|
| Inland Flood Mapping in New Brunswick and Updated Sea-Level Rise and Flooding Estimates for New Brunswick Coastal Sections 2020 | Service New Brunswick - GeoNB | 2020 | final |
Towns with a flood study on file
Mapping in New Brunswick reaches 93% of towns, Dieppe included, beside 58% across Canada.
NRCan Canada Flood Map Inventory: a study footprint touching the town’s boundary; towns of 2,500 people or more.
Listed, not scored: a flood study proves a map exists, not that Dieppe floods.
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 Dieppe: $0.033 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.
Nothing unusual about Dieppe’s ground: $0.033 against a typical $0.030, 1.1 times.
Shaking damage a year per $1,000 of building value
About level with the typical town in New Brunswick: Dieppe’s $0.033 against $0.036; St. Stephen reaches $0.16.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Around half of Canada’s 2,611 towns expect more shaking damage than Dieppe (48%).
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 Dieppe’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).
Test for radon in Dieppe: 20% of area homes were 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 Dieppe: 20% against 6.6% for the typical Canadian town.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Around Dieppe, 20% of tests topped the guideline, close to the typical town in New Brunswick (20%); 3.7% were over 600.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
More high tests than most: Dieppe sits in a band that only 22% of Canada’s 2,611 towns share, with 4.6% above.
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 Dieppe only a test can say.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011). · Area behind the radon tests figures: the Region 1 health region
Weather and fire alerts for Dieppe
Alerts for Dieppe 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 Dieppe to phones; CWFIS shows the day’s fire danger.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Hazards in the places around Dieppe
The same four hazards for the places next door.
| Town | Wildfire | Quake $/1,000 | Radon | Flood study |
|---|---|---|---|---|
| Dieppe | Low | $0.033 | 20% | Yes |
| Riverview 22,614 · 7.3 km | Low | $0.031 | 20% | Yes |
| Moncton 102,378 · 8.2 km | Low | $0.040 | 20% | Yes |
| Coverdale 5,167 · 12 km | Low | $0.031 | 20% | Yes |
| Moncton 12,238 · 15 km | Low | $0.033 | 20% | Yes |
| Hillsborough 1,569 · 16 km | Low | $0.022 | 20% | Yes |
| Memramcook 5,616 · 16 km | Low | $0.021 | 20% | Yes |
The fire record around Riverview is a touch heavier than Dieppe’s, but the band is the same: low (here low).
Radon is the survey area’s figure, so neighbours in one area share it.
Get ready for what Dieppe faces
Practical steps for Dieppe’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?
- 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. 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 Dieppe floods.
- 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 Dieppe’s.
- Wildfire counts one way. The wildfire figure is the share of land within 25 km of Dieppe’s homes burned each year from 1986 to 2025, past fire rather than a forecast, and it can only lower Risk.
- 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 Dieppe sits in.
Questions about flooding and hazards in Dieppe
Does Dieppe flood?
Dieppe’s area has been studied for flooding, and the owner’s map shows which streets lie in a zone; the grade leaves flood out.
Is radon a problem in Dieppe?
20% of the 107 homes Health Canada tested around Dieppe topped the guideline; your own house needs its own test.
Is Dieppe at risk of wildfire?
Not much by Canadian standards: Dieppe’s band is low, with 0.1% of the land within 25 km burned since 1986 (last in 2025), so wildfire doesn’t change its grade.
How is Dieppe’s Hazard risk Grade worked out?
Dieppe’s Hazard risk grade is C−, built on earthquakes and radon with a one-sided wildfire input.
How big is the earthquake risk in Dieppe?
Expected earthquake damage in Dieppe comes to $0.033 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).