Radon in Simcoe & Norfolk County
Norfolk County is one of the most rural parts of our service area: Simcoe, Delhi, Waterford and Port Rowan surrounded by farms that once grew most of Canada’s tobacco.
Simcoe radon guide
Radon in Norfolk & Haldimand
Radon testing and mitigation in Norfolk & Haldimand
Sandy Norfolk farm country and Lake Erie ports to the west, Haldimand’s clay plain and Grand River towns to the east.
Radon in Norfolk & Haldimand
Norfolk and Haldimand counties share a public health unit and a Lake Erie shoreline but sit on very different ground. Simcoe, Delhi, Port Dover and Port Rowan are on the Norfolk Sand Plain. Caledonia, Hagersville, Cayuga and Dunnville sit on the Haldimand Clay Plain along the Grand River. Many homes in both counties are rural, older and on private wells.
What’s under the ground
The Norfolk Sand Plain is a vast delta of sand and silt left by glacial lakes, the reason this was tobacco country. Those soils drain fast and let soil gas travel freely. To the east, the Haldimand Clay Plain is dense and slow-draining, but clay shrinks and cracks in dry weather, and gas follows trenches and backfill to foundations.
The homes
Farmhouses with fieldstone foundations, lakeside cottages around Turkey Point and Port Dover, and a wave of new subdivisions in Caledonia and Simcoe cover most of the housing here. Each has its own radon entry points. Of all our regions, this one has the biggest gap between rural and in-town homes.
Public health: Grand Erie Public Health.
What the data says
1 in 8
Ontario homes at or above Health Canada’s 200 Bq/m³ guideline in the 2024 Cross-Canada Survey, more than double the share found a decade earlier.Source: Cross-Canada Survey of Radon Exposure in the Residential Buildings of Urban and Rural Communities (2024)
+30%
Higher average radon exposure for rural residents than urban residents in a 2024 national study of 42,051 homes, mostly linked to drilled wells.Source: Goodarzi et al., Scientific Reports (2024) — rural communities and drilled-well annuli
~100
Roughly how many homes per health region the first national survey (2009–2011) could test. Too few to clear any neighbourhood, which is why public maps can’t tell you about your house.Source: Health Canada — Cross-Canada Survey of Radon Concentrations in Homes, Final Report (2012)
Local factors
Why Norfolk homes should test
Sandy or gravelly soils
Sand and gravel let soil gas move freely and over longer distances. More of the radon formed in the ground can reach the air around your foundation instead of decaying in place.
Clay plains
Dense clay slows soil gas, but it cracks in dry spells. Gas then follows the easiest route: the gravel backfill, weeping tile and utility trenches that lead straight to a basement.
Rural homes on drilled wells
A 2024 national study of over 42,000 homes found rural residents were exposed to about 30% more radon than urban residents, with most of the gap linked to drilled wells. Researchers suspect gas travels up the gap around the well casing.
Century homes
Fieldstone, rubble and early concrete foundations, earth-floor cellars and open sumps give radon many ways in. Older doesn’t mean safer: these homes still need a test.
Cottages and crawlspaces
Lakeshore cottages converted to year-round homes often sit on crawlspaces, piers or patched slabs. Once winterized and heated, they can start pulling in soil gas they never did as summer places.
Communities
Where we work in Norfolk & Haldimand
Radon in Port Dover
Port Dover is a Lake Erie harbour town that has gone from summer destination to year-round home for many families and retirees.
Port Dover radon guide
Radon in Caledonia & Haldimand County
Haldimand County follows the Grand River from Caledonia to Dunnville, with Hagersville, Cayuga and Jarvis in between.
Caledonia radon guide
Questions
Radon in Norfolk & Haldimand: common questions
Does sandy soil in Norfolk County mean more radon?
Sandy soil doesn’t make radon, but it lets radon move. Where the ground holds uranium-bearing glacial debris, permeable sand lets more of the gas reach your foundation before it decays. That’s one reason neighbouring homes can test very differently.
Is a clay soil home in Haldimand safe from radon?
Not automatically. Clay slows soil gas, but it cracks when dry, and the gravel around your foundation and under your slab gives gas a direct path in. Clay-plain homes still need a long-term test.
Book a radon test in Norfolk & Haldimand
C-NRPP certified testing and mitigation across Simcoe, Port Dover, Caledonia.