New Brunswick has moderate to elevated radon risk, with the highest levels concentrated in areas underlain by uranium-bearing geological formations, particularly around Sussex, the Saint John River valley, and parts of the Fredericton region. The province's mix of older housing stock and varied geology means test results can differ significantly from one neighbourhood to the next. The 2024 Cross-Canada survey found about 27% of New Brunswick homes exceed the guideline, and testing is recommended across the province.

Typical Mitigation Cost in New Brunswick

$2,000–$3,500

Near national average

Market is smaller than central Canada; some rural areas may see higher costs due to limited contractor availability.

•Foundation type: many older NB homes have stone or block foundations
•Urban (Moncton, Fredericton, Saint John) vs. rural contractor availability
•Sub-slab conditions and required number of suction points
•Basement finish level
•Crawlspace vs. basement construction type

Local radon data

How common is high radon in New Brunswick?

High

1 in 3.7

homes in New Brunswick have radon above Health Canada's action level of 200 Bq/m³. That's higher than Canada as a whole (1 in 5.6).

Check your postal code on the radon map

Cities in the 2024 survey

Saint John1 in 5.6 homes
Fredericton1 in 7 homes
Moncton1 in 14 homes

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Frequently Asked Questions: Radon in New Brunswick

The Sussex area in Kings County, parts of the Saint John River valley, and some Fredericton-area communities sit over uranium-bearing geological formations and tend to record higher radon levels. However, every region of NB should be tested, as local geology varies.

New Brunswick follows Health Canada's national guideline of 200 Bq/m³. The New Brunswick Department of Health supports Health Canada's radon testing and mitigation recommendations.

Radon testing is not required by law in New Brunswick real estate transactions, though awareness is increasing. Some buyers in known higher-risk areas include radon testing in their inspection requests.

Radon enters through cracks in foundation walls and floor slabs, construction joints, gaps around pipes and posts, floor drains, and sump pits. In some areas, groundwater from drilled wells can also contribute radon to indoor air.

Health Canada recommends a minimum 91-day test during the heating season, placed in the lowest livable area of the home. This gives the most accurate picture of your average annual exposure.

Radon can dissolve in groundwater drawn from certain NB rock formations. If your home has a drilled well and your indoor radon tests high, a water test and point-of-entry aerator or carbon filter may be recommended alongside standard mitigation.

Use the city search above to find certified radon professionals serving Moncton, Fredericton, Saint John, and other New Brunswick communities.

Most NB homeowners pay between $1,800 and $3,000 for a complete sub-slab depressurization system. Older homes with stone foundations or multiple entry points may require additional sealing work.

Radon Resources for New Brunswick

Tools and guides to help you understand radon risk and take action.

Check your radon risk

Estimate your risk based on province, home age, and foundation type.

Understand your test results

Learn what Bq/m³ means and when action is required.

DIY radon test kits

Compare test kit options starting from $10.

Radon guides & articles

In-depth guides on testing, mitigation, and health risk.

Radon map of Canada

See how common high radon is in your postal code.

Radon FAQ

Answers to the most common questions about radon.