Radon in Fredericton (2026): What the Data Shows, Why NB Is Canada's Highest-Radon Province, and What Fredericton Homeowners Should Do

Flat-vector map of Canada with a coral red pin marking Fredericton, New Brunswick, alongside a circular badge showing 21% — New Brunswick's leading provincial share of homes above the Health Canada radon guideline

A note before you read. This article is general health and home-testing information for Fredericton homeowners, drawn from Health Canada, the Government of New Brunswick, NB Lung (Poumon NB), the New Brunswick Real Estate Association, and the Canadian Cancer Society. It is not medical advice. See full disclaimers at the bottom.

If you live in Fredericton and you've heard New Brunswick has serious radon, the data confirms it — and then some. New Brunswick has the highest provincial residential radon prevalence in Canada per Health Canada's published data: about 21% of NB homes test above the Health Canada 200 Bq/m³ guideline, with some NB regions reaching up to 40%. Among the 14 Canadian Health Regions with the highest radon rates nationally (23–44% above guideline), four were in New Brunswick — second only to Manitoba. New Brunswick also has one of the highest lung cancer rates in Canada, partly attributable to long-term radon exposure.

The good news: NB Lung runs one of the most active provincial radon programs in Canada. As of 2022, all NB Lung radon kits are now analyzed in Fredericton at RPC Laboratories — meaning Fredericton homeowners using NB Lung's kit have their samples processed locally, eliminating the need to ship to a US lab. NB public libraries lend short-term radon detection kits free of charge, and New Brunswick is positioning itself to be the first Canadian province to offer free radon testing to the general public.

This guide walks through the New Brunswick and Fredericton data, explains why NB residential radon is so high, and lays out the practical step-by-step from "I want to know" to "result in hand."

TL;DR for Fredericton homeowners

  • New Brunswick has the highest provincial residential radon prevalence in Canada — about 21% of NB homes above the 200 Bq/m³ guideline (Health Canada 2012 Cross-Canada Survey), with some regions reaching up to 40%.
  • Four NB Health Regions were among the 14 Canadian Health Regions with highest radon rates (23–44% above guideline) — second only to Manitoba.
  • NB has one of the highest lung cancer rates in Canada, partly attributable to long-term radon exposure.
  • NB Lung's radon kits are now analyzed in Fredericton at RPC Laboratories (since 2022) — locally processed, no US shipping.
  • NB public libraries lend short-term radon detection kits free of charge, and NB will be the first province to offer free radon testing to the general public.
  • The only way to know your home's level is to test it. Long-term test, 91+ days, ideally during the heating season. Order a $89 long-term radon test kit →

Table of contents

  1. What the published New Brunswick radon data actually shows
  2. Why Fredericton/NB radon is so high — geology, climate, and construction
  3. What to do as a Fredericton homeowner
  4. Local NB resources: NB Lung, library lending, and free public testing
  5. FAQ — Fredericton-specific questions
  6. Disclaimers
  7. Sources

What the published New Brunswick radon data actually shows

New Brunswick's residential radon picture is unambiguous in the published data:

  • NB province-wide (2012 Cross-Canada Survey): about 21% of homes above the 200 Bq/m³ guideline — the highest provincial prevalence in Canada.
  • Some NB regions reach up to 40% of homes above the guideline.
  • Four NB Health Regions were among the 14 Canadian Health Regions with the highest radon rates (23–44% above guideline) — more than any province except Manitoba.
  • NB has one of the highest lung cancer rates in Canada, with radon recognized as a significant contributing factor.
  • More recent provincial testing continues to confirm NB's elevated profile, with NB Lung leading ongoing community-level testing programs.

Sources: Health Canada Cross-Canada Survey; NB Lung — NB Lung's Landmark Role in Cross-Canada Radon Survey; Take Action on Radon — Atlantic provinces; Government of New Brunswick — Radon

The takeaway: roughly one in five Fredericton-area homes has radon levels Health Canada considers worth acting on, and in some NB regions the figure approaches one in two. The only way to know your specific home's level is a long-term radon test.

Order a $89 long-term radon test kit →

Why Fredericton/NB radon is so high — geology, climate, and construction

Three independent factors stack to produce New Brunswick's exceptionally high residential radon:

1. Geology. This is NB's biggest factor. Much of southern and central New Brunswick — including the Fredericton region — sits on Devonian and Carboniferous bedrock containing variable but often elevated uranium content. The Saint John River valley around Fredericton has documented higher background radon than many other Canadian cities. Geology alone places NB in the highest provincial radon profile in the country.

2. Climate. Fredericton has a long heating season — typically October through April — with cold winters that lead to homes being sealed against the weather. Furnaces and HVAC systems run regularly, and the natural "stack effect" (warm air rising through the home creating negative pressure at the lowest level) actively pulls soil gas into basements.

3. Building construction. Fredericton's housing stock includes many older homes (built before any radon-aware construction requirements), modern single-family homes with full basements, and a mix of urban and suburban construction. Older homes typically lack any radon construction features; modern energy-efficient construction tightens the building envelope and tends to retain more indoor radon.

The combination — uranium-bearing geology + a long heating season + diverse housing stock with limited radon-aware construction — is why NB consistently shows the highest provincial residential radon rates in Canada.

What to do as a Fredericton homeowner

Step-by-step:

Step 1: Test (long-term, 91+ days). Health Canada's recommended test for a homeowner mitigation decision is a long-term alpha-track lab test, deployed for at least 91 days during the heating season (October–April in Fredericton), in the lowest lived-in level of your home. The test costs $89 all-in with RadonTest.ca — kit, tracked outbound, prepaid tracked Canada Post return label, and analysis at Lex Scientific in Guelph, Ontario (a C-NRPP-listed Canadian lab).

Alternatively, NB Lung offers radon kits analyzed at RPC Laboratories in Fredericton since 2022 — a fully NB-based local testing pathway. Both options are C-NRPP-aligned; RadonTest.ca provides faster nationwide consumer ordering, while NB Lung's program supports local NB radon research and infrastructure.

Step 2: Read your result. Below 200 Bq/m³, no mitigation is required (Health Canada recommends retesting every 5 years). Above 200 Bq/m³, mitigation is recommended. See our How to Read Your Radon Test Results and What to Do If Your Radon Level Is Above 200 Bq/m³ guides.

Step 3: Mitigate, if needed. A C-NRPP-certified mitigation contractor installs a sub-slab depressurization system at a typical Atlantic Canada cost of $2,500–$4,500. These systems typically reduce radon by up to 95%. Find a Fredericton-area C-NRPP-certified mitigator via the C-NRPP Find a Professional tool.

Step 4: Apply for the Lungs Matter grant. The Canadian Lung Association's Lungs Matter program offers up to $1,500 toward radon mitigation for eligible Canadian homeowners.

Step 5: Verify. Once mitigation is complete, run an independent post-mitigation test to confirm levels are below 200 Bq/m³ and stay that way.

Order your Fredericton kit — $89 →

Local NB resources: NB Lung, library lending, and free public testing

New Brunswick has one of the most active and consumer-friendly provincial radon ecosystems in Canada:

  • NB Lung — Radon program (nblung.ca/environmental-health/radon) — sells long-term radon test kits (analyzed since 2022 at RPC Laboratories in Fredericton, eliminating US shipping). Includes return postage and lab fees in the kit price.
  • NB Lung — Radon Lending Program (nblung.ca/radon-lending-program) — partnership program with select NB MLA offices, realtors, and community health centres providing free electronic radon screening kits.
  • Service NB — Radon Detection Kit Lending through Public Libraries (snb.ca) — NB public libraries lend free short-term radon detection kits to help homeowners assess radon levels.
  • Government of New Brunswick — Radon (gnb.ca/.../radon) — provincial Office of the Chief Medical Officer of Health radon information
  • NBREA — Radon: What you need to know (nbrea.ca/radon-what-you-need-to-know) — New Brunswick Real Estate Association radon disclosure framework, explicitly endorsing mitigation holdback structures tied to a 200 Bq/m³ threshold
  • Take Action on Radon — Atlantic provinces (takeactiononradon.ca/provinces/atlantic)
  • Canadian Lung Association — Lungs Matter mitigation grant (lung.ca) — up to $1,500 for eligible Canadians
  • C-NRPP Find a Certified Professional (c-nrpp.ca) — Fredericton-area certified measurement and mitigation professionals

Library borrowing — important note. The NB library borrowable detectors are short-term screening tools. They provide a quick indicator but are not substitutes for a long-term lab-analyzed test for the actual mitigation decision. Use a library detector as initial screening; follow up with a long-term test for the mitigation-decision result.

Note on NB building code. NB uses the National Building Code 2020, which requires a Level 1 radon "rough-in" (capped vent pipe through the slab + soil gas barrier + sealed perimeter) in new construction. See our Canadian Building Codes and Radon guide.

Note on NB real estate disclosure. NBREA explicitly endorses mitigation holdback structures tied to a 200 Bq/m³ threshold. The latent-defect doctrine applies under common-law principles, and a known elevated radon reading is generally treated as a material defect requiring disclosure. See our Real Estate Radon Guide.

FAQ — Fredericton-specific questions

How common is high radon in Fredericton? Per Health Canada's 2012 Cross-Canada Survey, about 21% of NB homes test above the 200 Bq/m³ guideline — the highest provincial rate in Canada. Some NB regions reach up to 40%. Fredericton sits in central NB, in geology associated with elevated background radon. The only way to know your specific home's level is to test it.

Why does NB have the highest radon in Canada? Three factors combine: NB's bedrock geology contains uranium concentrations among the higher ranges in Canadian residential geology; the long Atlantic-Canadian heating season seals homes for most of the year; and NB's housing stock includes many older homes built without any radon-aware construction features. See the "why" section above.

Are some Fredericton neighbourhoods worse than others? NB's geology varies across the province, with Saint John River valley areas (including parts of Fredericton) showing notable variation. Individual home levels vary substantially even within neighbourhoods; the only way to know your specific home's level is to test it.

Can I borrow a radon detector from the library in Fredericton? Yes — Service NB operates a Radon Detection Kit Lending program through public libraries. Important: the borrowable detector is a short-term screening tool and is not a substitute for a long-term lab-analyzed test for the mitigation decision. Use the library detector as initial screening; follow up with a long-term test for the real answer.

Where does NB Lung send my radon kit for analysis? Since 2022, NB Lung kits are analyzed at RPC Laboratories in Fredericton — a fully New Brunswick–based testing pathway with no US shipping required. (NB Lung)

Does my newer Fredericton home have a radon rough-in? If your home was built under the National Building Code 2020 (or earlier NB adoption of NBC 2010 radon provisions), it should have a capped vent pipe stub through the basement slab. The rough-in is infrastructure for future mitigation, not active reduction.

How much does radon mitigation cost in Fredericton? Typical Atlantic Canada residential mitigation costs are $2,500–$4,500 for a sub-slab depressurization system installed by a C-NRPP-certified contractor. The Canadian Lung Association's Lungs Matter program may offset up to $1,500.

Where can I buy a long-term radon test kit in Fredericton? Two strong options: (1) a RadonTest.ca $89 all-in long-term kit ordered online and delivered to Fredericton — kit + tracked outbound + prepaid tracked Canada Post return label + analysis at a C-NRPP-listed Canadian lab; (2) NB Lung's radon kit analyzed locally at RPC Laboratories in Fredericton (a fully NB-based testing pathway).

Do I have to disclose elevated radon when I sell my Fredericton home? NB uses standard provincial property disclosure principles, and the common-law latent-defect doctrine applies. NBREA explicitly endorses mitigation holdback structures tied to a 200 Bq/m³ threshold for real estate transactions involving elevated radon. See our full Real Estate Radon Guide, and consult a NB real estate lawyer for any specific transaction.

When is the best time of year to test in Fredericton? The heating season — October through April — produces the highest indoor radon levels and is the recommended testing window per Health Canada. A long-term test (91+ days) started in early October gives you a strong heating-season reading.

Where can I find a C-NRPP-certified radon mitigator in Fredericton? The C-NRPP Find a Certified Professional directory lists certified measurement and mitigation professionals by area. Fredericton has an established C-NRPP-certified mitigator population given NB's documented high radon rates.

Test your Fredericton home — $89, all in

NB has the highest documented residential radon prevalence in Canada, Fredericton sits in geology associated with elevated background radon, and the action item is the same one any Canadian homeowner should take: a long-term radon test that produces a real lab result.

RadonTest.ca — $89 all-in (plus applicable tax). Long-term 91-day alpha-track test kit. C-NRPP-listed device. Analysed at Lex Scientific in Guelph, Ontario — Canadian lab, C-NRPP listed, ISO/IEC 17025 accredited by CALA. Tracked Canadian shipping both ways. Written lab report PDF delivered to your inbox. About 1 in 5 NB homes test above the Health Canada guideline; the Lungs Matter grant can offset a meaningful portion of the mitigation cost for the ones that do.

Order — $89 →

Important disclaimers

Not medical, legal, or warranty advice. This article provides general health and home-testing information for Fredericton homeowners drawn from publicly available Health Canada, Government of New Brunswick, NB Lung (Poumon NB), NBREA, Canadian Cancer Society, and Service NB materials. It is not medical advice, legal advice, or warranty advice. Consult a qualified professional for specific decisions.

Statistics and citations. The 21% NB figure and the four-NB-Health-Regions figure are from Health Canada's 2012 Cross-Canada Survey of Radon Concentrations in Homes. NB Lung's role in ongoing testing reflects NB Lung's published reporting. National figures are from Health Canada's Radon: What You Need to Know fact sheet (2025). Sources update published figures periodically; figures cited reflect the sources as of May 2026.

Local Fredericton / NB data. Statements about NB radon levels reflect published Health Canada survey data, NB Lung publications, and provincial government materials. Radon levels vary substantially even between adjacent homes; community-level statistics do not substitute for a home-specific long-term test.

NB Lung / RPC Laboratories. Statements about NB Lung's program and RPC Laboratories analysis location reflect NB Lung's publicly available program information. Verify current program details directly at nblung.ca before relying on specific program features. RadonTest.ca is independent from NB Lung and RPC Laboratories.

Library borrowing program. The NB library borrowable detectors are short-term screening tools and are not substitutes for a long-term lab-analyzed test for the mitigation-decision result. Verify current program availability and detector model directly with your local NB public library or Service NB.

Mitigation cost. The $2,500–$4,500 mitigation cost range is a typical Atlantic Canada residential figure. Actual costs vary by home, foundation, complexity, and contractor.

Lungs Matter grant. Eligibility, grant amounts, and program availability for the Canadian Lung Association's Lungs Matter program may change. Verify directly at lung.ca before relying on the program.

Real estate disclosure. Statements about NB real estate disclosure reflect NBREA published guidance and the general latent-defect framework. Specific obligations for any individual transaction depend on the facts; consult a NB real estate lawyer.

No diagnosis or treatment claims. RadonTest.ca sells radon test kits. We do not diagnose, treat, or prevent disease.

No warranty as to completeness. RadonTest.ca makes no warranty as to the completeness or accuracy of the information herein and accepts no liability for decisions made in reliance on this article.

Sources & further reading

Fredericton- and NB-specific

Health Canada / national

National associations and grants

Related RadonTest.ca articles