Radon levels in Canadian homes by province and city: 2024 survey figures

This table reproduces the published figures from the 2024 Cross-Canada Radon Survey, Version 1.1. It gives the share of houses (single-detached, semi-detached and row, not apartments) at or above 200 Bq/m³ and the average level. The rows cover provinces, regions, community types, building types, cities and census divisions. Each figure describes a group of homes, so no average can tell you the level in your own home.

See what the survey figures add up to in the radon levels guide

The share of homes at or above 200 Bq/m³ differs by province

In Nova Scotia, 36.8% of homes were at or above 200 Bq/m³, a weighted figure. Quebec was at 16.7% and Ontario at 12.4%, both weighted.

In Manitoba and Saskatchewan, about 1 in 3 homes were at or above 200 Bq/m³. Their averages were 168.6 and 140.7 Bq/m³, both unweighted. The survey has no data for Nunavut.

See the figures for your province and city on their own pages

Rural homes and single-detached houses run higher

In rural areas, 23.8% of homes were at or above 200 Bq/m³, against 17.4% in urban areas. Single-detached houses were at 20.4%. Semi-detached houses were at 11.1%, and row houses at 7.9%. Each of these is its own row in the table, with the survey page it comes from.

Read why rural and detached homes run higher

Cities with the highest share are listed with their province

The survey reports 47 municipalities. Each row gives the province, the share at or above 200 Bq/m³, the averages and the highest reading. The survey names eighteen of them as priorities, where a quarter to half of homes were at or above 200 Bq/m³. It says thirteen cities need more testing.

The census division rows combine small divisions. Census divisions with fewer than 25 readings were pooled with their neighbours until each unit had 25. That gives 183 reported units, which cover 278 of 293 census divisions.

See the same figures on a map in the radon map explorer

Each figure carries its weighting status and sample band

We reproduce each figure exactly as the survey published it, with credit and the page it comes from. Each row says whether the figure is weighted or unweighted. It also gives its sample as a count or band of long-term readings. Any column we add is marked as ours.

Weighting can move an average. It raised the average in Prince George by 18% and lowered it in Kelowna by 15.4%. The tables are HTML only. There is no CSV or JSON download and no licence notice until the survey working group gives written permission.

See how we reproduce published data in our methodology