Brant & Brantford
Radon testing and mitigation in Paris & County of Brant, Ontario
Paris is famous for its 19th-century cobblestone buildings and its spot where the Nith meets the Grand. Here’s what’s known about radon in Paris, and how to find out about your home.
- Region
- Brant & Brantford
- Population
- about 39,000 (County of Brant)
- Public health
- Grand Erie Public Health
- Local factors
- 4 reasons to test
Is radon a problem in Paris?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Paris 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, century-home foundations and rural drilled wells are reasons to test. A 91-day test is the only way to know your home’s level.
Radon in Paris
Paris is famous for its 19th-century cobblestone buildings and its spot where the Nith meets the Grand. Around it, the County of Brant has grown quickly, with new homes in Paris, St. George and Burford and rural properties on private wells.
The ground under Paris
The area sits among the Paris and Galt moraines: ridges of coarse glacial sand, gravel and till. The gravel pits along the Grand show how much permeable ground there is. Coarse soils like these let soil gas move freely toward foundations.
Paris’s homes
Heritage homes in Paris often have stone or rubble foundations with many small openings. New subdivisions on the edges of Paris and St. George are large and airtight. Rural homes are on wells. Each is a reason to test, and each has a slightly different fix if levels are high.
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 Paris
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.
Paris: collecting results. Already tested? Check your number and share it anonymously when you book.
Local factors
What can push radon up in Paris
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.
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.
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.
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.
Where we work
Paris neighbourhoods and nearby communities
- Paris
- St. George
- Burford
- Glen Morris
- Scotland
- Oakland
- Cainsville
- Mount Pleasant
Nearby: Radon in Brantford · Radon in Woodstock · Radon in Ancaster · Radon in Cambridge
How it works
From test to fix
- Book
Tell us about your Paris 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 Paris: FAQ
Is radon a problem in Paris?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Paris 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, century-home foundations and rural drilled wells are reasons to test. A 91-day test is the only way to know your home’s level.
Can radon get through a cobblestone or fieldstone foundation?
Easily. Stone foundations have many mortar joints and gaps. During mitigation we seal the accessible joints and use sub-slab or sub-membrane depressurization to pull soil gas away before it reaches them.
Do you serve St. George and Burford?
Yes, along with Glen Morris, Scotland, Oakland, Mount Pleasant and the rest of the County of Brant.
Do you offer radon testing and mitigation in Paris?
Yes. We test and mitigate homes throughout Paris & County of Brant, including Paris, St. George, Burford, Glen Morris, Scotland and nearby. Call (226) 271-4667 or book online.
Radon is fixable. First, know your number.
Serving Paris, Brantford, Woodstock, Ancaster and Cambridge.