Hamilton
Radon testing and mitigation in Ancaster, Ontario
Ancaster combines one of Ontario’s oldest village cores with large newer homes in the Meadowlands and on the Escarpment brow, and estate properties on wells to the west. Here’s what’s known about radon in Ancaster, and how to find out about your home.
- Region
- Hamilton
- Population
- part of the City of Hamilton
- Public health
- Hamilton Public Health Services
- Local factors
- 4 reasons to test
Is radon a problem in Ancaster?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Ancaster home. A Hamilton public health survey found about 14% of 294 homes above the guideline. Across Ontario, about 1 in 8 homes tested at or above the guideline in the 2024 national survey. Locally, shallow or fractured bedrock, 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 Ancaster
Ancaster combines one of Ontario’s oldest village cores with large newer homes in the Meadowlands and on the Escarpment brow, and estate properties on wells to the west. These are big houses with big basements, often finished and well used.
The ground under Ancaster
Much of Ancaster sits on top of the Niagara Escarpment, where dolostone lies close to the surface beneath thin glacial soils. Joints and fractures in the rock can carry soil gas. Toward Jerseyville and Copetown, the ground becomes till and moraine.
Ancaster’s homes
Large two-storey and executive homes have tall, tight envelopes that create a strong stack effect. Historic homes in the village core have stone foundations. Rural properties on drilled wells add another factor. All benefit from a winter-season long-term test.
What the data says
Of 294 Hamilton homes in a public health survey were above the 200 Bq/m³ guideline (42 homes), as reported by Global News.Source: Global News — Hamilton public health survey of 294 homes
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)
Local results
Building a real radon picture for Ancaster
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.
Ancaster: collecting results. Already tested? Check your number and share it anonymously when you book.
Local factors
What can push radon up in Ancaster
Not a prediction for any single home, just the reasons a test is worth it here.
Shallow or fractured bedrock
Where rock sits close to the surface, as on the Niagara Escarpment or the limestone plains near Lake Erie, joints and fractures can act as pipelines that carry soil gas toward foundations.
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
Ancaster neighbourhoods and nearby communities
- Ancaster village core
- Meadowlands
- Jerseyville
- Copetown
- Alberton
- Carluke
Nearby: Radon in Hamilton · Radon in Paris · Radon in Brantford
How it works
From test to fix
- Book
Tell us about your Ancaster 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 Ancaster: FAQ
Is radon a problem in Ancaster?
Radon can exceed Health Canada’s 200 Bq/m³ guideline in any Ancaster home. A Hamilton public health survey found about 14% of 294 homes above the guideline. Across Ontario, about 1 in 8 homes tested at or above the guideline in the 2024 national survey. Locally, shallow or fractured bedrock, 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.
Do larger homes in Ancaster have more radon?
Size alone doesn’t decide it, but taller, more airtight homes create stronger suction at the basement level when heated. Large basements also mean more slab area and more potential entry points.
How many tests does a large home need?
Health Canada recommends at least one detector on the lowest level where someone spends more than four hours a day. In large or split foundations (say, a walkout plus a slab addition) we often place more than one.
Do you offer radon testing and mitigation in Ancaster?
Yes. We test and mitigate homes throughout Ancaster, including Ancaster village core, Meadowlands, Jerseyville, Copetown, Alberton and nearby. Call (226) 271-4667 or book online.
Radon is fixable. First, know your number.
Serving Ancaster, Hamilton, Paris and Brantford.