London & Middlesex
Radon testing and mitigation in Komoka & Middlesex Centre, Ontario
Middlesex Centre wraps around London’s west and north sides: Komoka and Kilworth on the Thames, Ilderton and Arva to the north, Delaware to the southwest. Here’s what’s known about radon in Komoka, and how to find out about your home.
- Region
- London & Middlesex
- Population
- about 19,000 (Middlesex Centre)
- Public health
- Middlesex-London Health Unit
- Local factors
- 4 reasons to test
Is radon a problem in Komoka?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Komoka 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, sandy or gravelly soils, new airtight construction and rural drilled wells are reasons to test. A 91-day test is the only way to know your home’s level.
Radon in Komoka
Middlesex Centre wraps around London’s west and north sides: Komoka and Kilworth on the Thames, Ilderton and Arva to the north, Delaware to the southwest. It’s one of the fastest-growing parts of the county, and much of that growth is new detached homes on sand and gravel.
The ground under Komoka
Komoka sits in the Thames valley among some of the region’s largest sand and gravel deposits; that’s why the area has been mined for aggregate for decades. Coarse, well-drained ground like this gives soil gas an easy route. Further north around Ilderton and Arva, the ground shifts to till plain.
Komoka’s homes
New two-storey homes in Komoka, Kilworth and Ilderton have large footprints and tight envelopes, which strengthens the stack effect. Estate lots and farm properties across the township are often on private wells, which a 2024 national study linked to higher 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)
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)
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
Local results
Building a real radon picture for Komoka
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.
Komoka: collecting results. Already tested? Check your number and share it anonymously when you book.
Local factors
What can push radon up in Komoka
Not a prediction for any single home, just the reasons a test is worth it here.
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.
New, airtight construction
Canadian research shows newer homes have tended to test higher than older ones. Bigger, taller and tighter homes create a stronger stack effect that draws soil gas in through the slab.
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.
Lived-in basements
Radon is usually highest on the lowest floor. Basement bedrooms, home offices and rental suites mean people spend hours a day where exposure is greatest.
Where we work
Komoka neighbourhoods and nearby communities
- Komoka
- Kilworth
- Ilderton
- Arva
- Delaware
- Denfield
- Coldstream
- Birr
Nearby: Radon in London · Radon in Strathroy
How it works
From test to fix
- Book
Tell us about your Komoka 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 Komoka: FAQ
Is radon a problem in Komoka?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Komoka 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, sandy or gravelly soils, new airtight construction and rural drilled wells are reasons to test. A 91-day test is the only way to know your home’s level.
Does living on gravel in Komoka raise radon levels?
Gravel doesn’t create radon, but it lets radon move. Where the ground contains uranium-bearing glacial debris, coarse soils let more of the gas reach your foundation before it decays. That’s why we’d test any Komoka basement, new or old.
Can you install a radon system in a finished basement?
Usually yes, with minimal disruption. We often place the suction point in a utility or storage room and route the pipe through a closet, the garage or up the outside wall. You’ll see the design before we drill.
Do you offer radon testing and mitigation in Komoka?
Yes. We test and mitigate homes throughout Komoka & Middlesex Centre, including Komoka, Kilworth, Ilderton, Arva, Delaware and nearby. Call (226) 271-4667 or book online.
Radon is fixable. First, know your number.
Serving Komoka, London and Strathroy.