A note before you read. This article provides general health and home-testing information for homeowners and renters in Trois-Rivières and the Mauricie, drawn from publications of Health Canada, the Institut national de santé publique du Québec (INSPQ), the OACIQ, CARST, and the Canadian Cancer Society. It is not medical advice and not legal advice. See full disclaimers at the bottom of the page.
Trois-Rivières, sitting at the confluence of the Saint-Maurice and St. Lawrence rivers, rests on sedimentary bedrock with a transition to the Canadian Shield to the north (upper Mauricie). Quebec's residential radon prevalence, according to Health Canada's Cross-Canada Survey of Radon Concentrations in Homes (2012), sits at roughly the Canadian average — about 7% of homes at 200 Bq/m³ or higher. Prevalence in the Mauricie can be above the provincial average in some sub-regions where uranium-bearing parent material is more present.
Whether you live in Trois-Rivières-Ouest, Cap-de-la-Madeleine, Sainte-Marthe-du-Cap, Pointe-du-Lac, or elsewhere in the Mauricie (Shawinigan, Bécancour, parts of Drummondville), radon testing is the baseline indoor-air-quality check. The Mauricie has many homes with full basements — exactly where radon concentrates.
The essentials for Trois-Rivières homeowners and renters
- Health Canada's residential guideline: 200 Bq/m³ (Health Canada — Radon).
- Test your Trois-Rivières home with a 91-day long-term alpha-track test in the lowest lived-in level, during the heating season (October–April).
- Order a long-term test kit for $89 →
- Real estate in Quebec is regulated by the OACIQ; the latent defect framework of the Civil Code generally engages disclosure of known elevated results.
Table of contents
- Why test Trois-Rivières homes
- What the Quebec and Mauricie data shows
- How to test your home
- Mitigation in Trois-Rivières
- Real estate and OACIQ disclosure
- Renters in Trois-Rivières
- FAQ — Trois-Rivières-specific questions
- Order your test kit
- Important disclaimers
- Sources and further reading
Why test Trois-Rivières homes
Trois-Rivières and the Mauricie rest on a transitional geology: sedimentary bedrock in the lower Mauricie along the St. Lawrence, and Precambrian Canadian Shield bedrock in the upper Mauricie to the north. This variable geology includes uranium-bearing parent material in certain sub-regions.
Three factors add up:
- Variable geology. Sedimentary in the south, Canadian Shield in the north, with uranium-bearing parent material in some areas.
- Long heating season. Quebec winters mean months of continuous furnace operation, creating a strong stack effect.
- Housing stock. Trois-Rivières has many homes with full basements used as bedrooms, home offices, and rental units.
The INSPQ treats residential radon as a public-health priority across Quebec.
What the Quebec and Mauricie data shows
Health Canada's 2012 Cross-Canada Survey places Quebec at roughly 7% of homes tested above the 200 Bq/m³ residential guideline. Regional prevalence varies: the lower Mauricie can be more modest, while more northern sub-regions can show higher prevalence owing to the Canadian Shield bedrock.
The practical takeaway: test your home; averages don't predict your specific reading.
How to test your home
Per Health Canada's published guidance (Guide for Radon Measurements in Residential Dwellings), the Canadian residential standard is a long-term test of at least 91 days using an alpha-track detector, deployed in the lowest lived-in level during the heating season (October–April).
For most Trois-Rivières homes:
- Finished basement if it serves as a bedroom, office, gym, or living space — that's where to test.
- Lowest sleeping level if the basement is unfinished.
- Ground floor only if the home has no basement.
Place the kit at breathing height (1 to 2 metres off the floor), away from drafts, exterior walls, and HVAC registers. Leave it in place for at least 91 days, then return it to the lab in the prepaid Canada Post envelope.
Order your long-term test kit for $89 →
Mitigation in Trois-Rivières
If your test exceeds 200 Bq/m³, the standard Canadian solution is active sub-slab depressurization (SSD). Typical cost in the Mauricie: $2,500 to $4,500 for a standard SSD installation on a single-family home.
Always use a C-NRPP-certified mitigation professional. Check the C-NRPP directory and filter by Quebec. The Mauricie is served by Quebec C-NRPP-certified contractors, several of whom work out of the major centres (Montreal, Quebec City).
For the full selection guide, see our guide How to Choose a Licensed Radon Mitigation Professional in Canada. After mitigation, run an independent post-mitigation test.
Real estate and OACIQ disclosure
Real estate in Quebec is regulated by the OACIQ. The Seller's Declaration form asks sellers to disclose known material defects. The latent defect (vices cachés) framework of Quebec's Civil Code is more buyer-protective than the common law in force in other provinces. A confirmed elevated radon test is generally the kind of material information that the doctrine can engage. Consult a Quebec notary or real estate lawyer for any specific transaction.
Renters in Trois-Rivières
Quebec's residential tenancy framework is administered by the Tribunal administratif du logement (TAL). The Civil Code generally requires landlords to deliver and maintain dwellings "in good habitable condition." See our guide Radon for Canadian Renters (2026).
FAQ — Trois-Rivières-specific questions
Is radon a real concern in Trois-Rivières? Yes — prevalence in the Mauricie can be roughly at the Quebec average in the lower region, and higher toward the north where the Canadian Shield predominates. Test your home.
What is the action level for radon in Trois-Rivières? 200 Bq/m³ — Health Canada's residential guideline.
How do I test my Trois-Rivières home? Use a 3-month (≥ 91-day) long-term alpha-track test from a C-NRPP-recognized lab, placed in the lowest lived-in level during the heating season. Cost: $89 all-in for a RadonTest.ca kit.
How much does radon mitigation cost in the Mauricie? Typical cost: $2,500 to $4,500 for a standard sub-slab depressurization (SSD).
Do Quebec sellers have to disclose radon? The latent defect (vices cachés) framework of Quebec's Civil Code and the OACIQ Seller's Declaration generally require disclosure of known material defects. Consult a Quebec notary or lawyer.
Does the Tarion warranty cover radon mitigation for new homes in Trois-Rivières? No — Tarion is the Ontario warranty. In Quebec, new-home warranties are administered by the Garantie de construction résidentielle (GCR).
Can I use the Lungs Matter grant in Trois-Rivières? The Lungs Matter program offers up to $1,500 to eligible Canadian homeowners. Verify directly.
Should I retest after mitigation? Yes — Health Canada recommends a retest after mitigation and after major renovations.
What if my landlord refuses to remediate elevated radon? Document everything in writing and consider a recourse with the Tribunal administratif du logement (TAL).
Are there fewer C-NRPP contractors in the Mauricie than in Montreal or Quebec City? The Mauricie has fewer C-NRPP contractors than the major centres. Several contractors based in Montreal or Quebec City offer their services in the Mauricie. Plan your timeline.
Order your test kit
Order your long-term test kit — $89 all-in →
91-day long-term 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. PDF lab report delivered to your inbox.
Shipping across the Mauricie including Trois-Rivières, Cap-de-la-Madeleine, Shawinigan, Bécancour, and surrounding municipalities.
Important disclaimers
Not medical, legal, or warranty advice. Consult qualified Quebec professionals for any specific decision.
Statistics and citations. Quebec prevalence figures are drawn from Health Canada's 2012 Cross-Canada Survey and the INSPQ's regional publications. Figures reflect the sources as of May 2026.
Local data. The Mauricie has variable geology and substantial home-to-home variability. Test your home.
Mitigation cost. The $2,500 to $4,500 range reflects typical Canadian prices in 2026. Actual prices vary.
Lungs Matter grant. Eligibility, grant amounts, and program availability may change. Verify directly at lung.ca before relying on the program.
No diagnosis or treatment claims. RadonTest.ca sells radon test kits. We do not diagnose, treat, or prevent any disease.
No warranty as to completeness. RadonTest.ca makes no warranty as to the completeness or accuracy of the information presented here and accepts no liability for decisions made in reliance on this article.
Sources and further reading
Quebec-specific
- INSPQ — Radon
- OACIQ
- Tribunal administratif du logement (TAL)
- Garantie de construction résidentielle (GCR)
Health Canada / national
- Health Canada — Radon
- 2012 Cross-Canada Survey
- Canadian Cancer Society — Radon
- Canadian Lung Association — Lungs Matter
- C-NRPP — Find a Professional
- CARST
- Take Action on Radon
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