Photo: Murray Foubister · CC BY-SA 2.0Flood mapping exists for Nisga'a: 1 on record, latest by Nisg?a’a Lisims Government
For Nisga'a, wildfire history is close to nil: 0% of nearby land since 1986, 0.001% a year. Seismic risk in Nisga'a sits near the middle: $0.033 of expected damage per $1,000 of buildings a year, the typical town $0.030. Radon is about average around Nisga'a: 5.2% of tested homes in the survey area topped the guideline, against 6.6% for the typical town. Hazard risk gives Nisga'a a grade of B+; its wildfire band pulls it down.
What stands out about Nisga'a’s hazards
For Nisga'a, from NRCan’s seismic model, Health Canada’s radon survey, the national burned-area record and the flood map inventory.
What Nisga'a faces
Each hazard against its own yardstick; meters run from low to high on that yardstick.
Wildfire
Earthquakes
Radon
Flood study
Hazard risk in Nisga'a: B+
The grade weighs Nisga'a’s seismic risk and radon equally, and wildfire is one-sided: a high band counts against a town, a low one earns nothing.
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.
Little of the land around Nisga'a has burned: 0% within 5 km, 0% within 25 km since 1986
Fires mapped since 1986 around where Nisga'a’s residents live, and the fuel next to their homes.
A burn rate of 0.001% a year keeps Nisga'a in the low band (the typical Canadian town: 0.000%).
Fire has stayed at least 5.5 km from Nisga'a’s homes since 1986.
More forest grows near Nisga'a’s homes (74% within 5 km) than across 25 km (57%).
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 British Columbia · highest of 256
Oliver tops the 256 towns in British Columbia at 0.98% a year; Nisga'a, at 0.001%, comes 239th.
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; Nisga'a 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.
A flood study covers Nisga'a, from Nisg?a’a Lisims Government: 1 on the inventory
Flood studies whose area touches Nisga'a, from NRCan’s inventory, each linked to its owner.
Nisg?a’a Lisims Government holds the flood mapping that covers Nisga'a (2022), linked below.
| Study | By | Year | Status |
|---|---|---|---|
| Adaptation of the Nisga'a Nation to the Impacts of Climate Change | Nisg?a’a Lisims Government | 2022 | final · not public |
Towns with a flood study on file
Mapping in British Columbia reaches 76% of towns, Nisga'a 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.
Flood mapping is shown for Nisga'a to be opened and checked, never turned into a grade.
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 Nisga'a $0.033 per $1,000 a year
NRCan’s seismic risk model: the damage shaking is expected to do to buildings each year, on average over many years.
At $0.033 per $1,000, Nisga'a’s earthquake risk is about the typical Canadian town’s ($0.030; 1.1 times).
Shaking damage a year per $1,000 of building value
The typical town in British Columbia expects $0.36 a year in shaking damage; Nisga'a expects less, $0.033, and Duncan the most, $1.33.
NRCan seismic risk model (2022): mean yearly building loss per $1,000 of value; medians of towns of 2,500 people or more.
Nisga'a sits mid-range among Canada’s 2,611 towns: 48% expect more shaking damage.
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 Nisga'a 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).
5.2% of homes tested around Nisga'a are over the radon guideline
Health Canada’s survey of long-term home tests: the share above the 200 Bq/m³ guideline.
Near the middle for radon: Nisga'a’s area 5.2%, the typical Canadian town 6.6%. Behind radon tests sits data gathered across the Northwest health region, with Nisga'a one part of it.
Tested homes over 200 Bq/m³
Over 600 Bq/m³
Nisga'a’s area, at 5.2%, is above the median in British Columbia (1.8%), and 1.4% of its tests passed 600 Bq/m³.
Health Canada radon survey (2009–2011), by 2007 health region; medians of towns of 2,500 people or more.
A middling share of high tests puts Nisga'a with 37% of Canada’s 2,611 towns, below 26% of them.
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.
A low area share in Nisga'a doesn’t clear a house, nor does a high one condemn it: test.
Health Canada, Cross-Canada Survey of Radon Concentrations in Homes (2009–2011).
Where to get warnings in Nisga'a
Alerts for Nisga'a 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. |
Evacuation orders for Nisga'a come from the municipality or the province, while CWFIS maps fire danger every day.
Weather alerts (ECCC) · Alert Ready · Fire danger and active fires (CWFIS)
Get ready for what Nisga'a faces
What to do about the hazards Nisga'a 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 Nisga'a.
- Wildfire counts one way. For Nisga'a, wildfire means how much nearby land burned in the past forty years, a one-way input that can pull Risk down and nothing more.
- Radon is a survey. About 14,000 homes were tested across Canada in 2009–2011, and the share over the guideline for Nisga'a is its health region’s, the survey’s design unit.
- Earthquakes are modelled. Seismic risk is NRCan’s model of yearly building losses from shaking, averaged over many years and given for Nisga'a’s census subdivision (a neighbourhood shows its city’s).
Questions about flooding and hazards in Nisga'a
Does Nisga'a flood?
There is flood mapping for Nisga'a on the national inventory, each study linked to its owner’s map, none of them graded.
How big is the earthquake risk in Nisga'a?
Expected earthquake damage in Nisga'a comes to $0.033 a year for each $1,000 that buildings are worth.
Is radon a problem in Nisga'a?
In Health Canada’s survey, 5.2% of 211 homes tested in Nisga'a’s area were above 200 Bq/m³, though only a test tells you about one house.
Is Nisga'a at risk of wildfire?
Less than most of Canada: 0% of the land within 25 km of Nisga'a has burned since 1986, the last in 2023, a low band that leaves Risk alone.
How is Nisga'a’s Hazard risk Grade worked out?
Nisga'a’s Hazard risk grade is B+, built on earthquakes and radon with a one-sided wildfire input.
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).