Elgin & St. Thomas
Radon testing and mitigation in Aylmer, Ontario
Aylmer is the market town for eastern Elgin, surrounded by Malahide and Bayham townships’ farmland. Here’s what’s known about radon in Aylmer, and how to find out about your home.
- Region
- Elgin & St. Thomas
- Population
- about 7,700
- Public health
- Southwestern Public Health
- Local factors
- 4 reasons to test
Is radon a problem in Aylmer?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Aylmer home. No published local data rules any neighbourhood in or out. Across Ontario, about 1 in 8 homes tested at or above the guideline in the 2024 national survey. Locally, rural drilled wells, century-home foundations and sandy or gravelly soils are reasons to test. A 91-day test is the only way to know your home’s level.
Radon in Aylmer
Aylmer is the market town for eastern Elgin, surrounded by Malahide and Bayham townships’ farmland. Most homes outside town rely on private wells, and many farmhouses are well over a century old.
The ground under Aylmer
The area sits between the clay-rich Lake Erie lowland and the sandier ground that leads east into the Norfolk Sand Plain. Catfish Creek runs through town. Where sand and clay meet, soil permeability can change sharply within a few hundred metres, one reason neighbouring farms can test very differently.
Aylmer’s homes
Older homes in town and on farms often have fieldstone or rubble foundations and earth or partial-earth cellars. Rural homes on drilled wells are worth a test; a 2024 national study linked well proximity to higher indoor radon.
What the data says
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)
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
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 results
Building a real radon picture for Aylmer
Public radon data for Southern Ontario towns is thin. The national surveys tested only a handful of homes per area. So we’re building our own: anonymized long-term results from homes we test, published by area once there are at least 30, so no single home can be identified and small samples can’t mislead.
Aylmer: collecting results. Already tested? Check your number and share it anonymously when you book.
Local factors
What can push radon up in Aylmer
Not a prediction for any single home, just the reasons a test is worth it here.
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.
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.
Where we work
Aylmer neighbourhoods and nearby communities
- Aylmer
- Malahide Township
- Springfield
- Port Bruce
- Bayham
- Straffordville
- Port Burwell
- Vienna
Nearby: Radon in St. Thomas · Radon in Tillsonburg · Radon in Port Stanley
How it works
From test to fix
- Book
Tell us about your Aylmer home. We reply within one business day.
- Test for 91+ days
A certified technician places long-term detectors on your lowest lived-in floor. You get an early reading at 2 weeks.
- Get your result
Lab-verified average, explained against Health Canada’s guideline.
- Fix it if it’s high
A sub-slab system designed for your foundation, at a fixed price, with results guaranteed.
Questions
Radon in Aylmer: FAQ
Is radon a problem in Aylmer?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Aylmer home. No published local data rules any neighbourhood in or out. Across Ontario, about 1 in 8 homes tested at or above the guideline in the 2024 national survey. Locally, rural drilled wells, century-home foundations and sandy or gravelly soils are reasons to test. A 91-day test is the only way to know your home’s level.
Can radon come from my well water?
Water can carry dissolved radon, but researchers testing Canadian wells found the water itself rarely adds much to indoor air. The bigger concern appears to be soil gas travelling up the space around the well casing. An air test is the right first step.
Do you serve farms outside Aylmer?
Yes. We work throughout Malahide and Bayham, including Springfield, Port Bruce, Straffordville, Vienna and Port Burwell.
Do you offer radon testing and mitigation in Aylmer?
Yes. We test and mitigate homes throughout Aylmer, including Aylmer, Malahide Township, Springfield, Port Bruce, Bayham and nearby. Call (226) 271-4667 or book online.
Radon is fixable. First, know your number.
Serving Aylmer, St. Thomas, Tillsonburg and Port Stanley.