Radon testing guides

Radon is a radioactive gas that forms in the soil as uranium breaks down. It seeps in through foundation cracks and gaps around pipes. Insulation and a tight house hold it indoors. Years of exposure cause lung cancer, and the gas is still little known. Use the search below for the words people look up: radioactive gas, uranium, foundation, airtight home, lung cancer, becquerels.

Radon in St. Catharines: Niagara was 2.0% of 100 homes

The Niagara region was 2.0% above 200, and that 2.0% was entirely above 600. Hamilton was 5.0%.

Oct 26, 2026

Radon in Prince George: the Northern Interior was 12% of 208 homes

Northern Interior health area: 12.0% above 200 Bq/m³ on 208 homes. Vancouver was 1.2%. The region is much larger than the city.

Oct 26, 2026

Radon in Victoria: South Vancouver Island was 1.8% of 55 homes

The island sample was small and low. The Kootenays, same province, were 29.3%. Victoria does not speak for Castlegar.

Oct 26, 2026

Radon in Laval: 12.1% of 107 homes, higher than Montreal’s 6.9%

Laval and Montreal were separate rows in the 2012 survey. The river is not a shared result.

Oct 26, 2026

Radon in Gatineau: the Outaouais region was 12.9% of 62 homes

Outaouais was 12.9% above 200 Bq/m³, with 4.8% above 600, on a short sample. Ottawa’s health unit was 6.2%.

Oct 26, 2026

Radon in Sherbrooke: Estrie was 9.3% on only 54 homes

The Estrie sample was small: 9.3% of 54 homes above 200, none above 600. Sherbrooke does not get its own row.

Oct 26, 2026

Radon in Quebec City: the Capitale-Nationale region was 8.8%

8.8% of 160 homes in the Capitale-Nationale region were above 200 Bq/m³, with 2.5% above 600. Gaspésie was 25.3%.

Oct 26, 2026

Radon in Saint John, New Brunswick: region 2 tested at 10.9%

Health region 2 was 10.9% of 101 homes above 200. Moncton’s region was 19.8%. Region 6 was 40%.

Oct 26, 2026

Radon in Moncton: New Brunswick health region 1 tested at 19.8%

Region 1 was 19.8% of 106 homes above 200 Bq/m³, with 3.8% above 600. The province’s raw figure was 24.8%.

Oct 26, 2026

Radon in Mississauga: Peel’s 2012 sample was 0% of 89 homes

The Peel region, which includes Mississauga and Brampton, had no result above 200 in 89 homes. That sample is short, and it is not a cert...

Oct 26, 2026

Radon in Waterloo: 4.0% of 101 homes in the 2012 sample

Waterloo region was 4.0% above 200. Guelph’s health unit, next door, was 10.9%.

Oct 26, 2026

Radon in Sudbury: 5.1% of 97 homes in the 2012 sample

Sudbury and District was 5.1% above 200 Bq/m³. Thunder Bay, further west, was 12.0%.

Oct 26, 2026

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