Radon is a colourless, odourless radioactive gas that seeps out of the bedrock and accumulates indoors, and it is the second leading cause of lung cancer in Canada after smoking. Eastern Ontario sits in an elevated zone. The thing that makes it worth a page rather than a paragraph is that the risk is invisible and the test is cheap — you cannot smell it, no home inspection catches it by default, and a neighbour's result tells you nothing about your own house. Two homes on the same road can differ by a factor of ten.
RadonTest.caIndependent
Nepean · Mail-in long-term test kits ($75) using detectors that have passed C-NRPP performance testing, returned to a lab for a certificate of analysis. Testing only — no mitigation.
Who we'd call first for this work in K4M — how we choose, and it's never for money.
If they're booked
The next two calls — same standard, next in line for the top spot. No business has paid to be here, or anywhere on this site. Location and credential facts come from each business's own public sources; how we check them. Know a business that belongs here? Tell us.
Independent means locally owned rather than a chain or franchise.
manotick.co is a directory, not a party to any work. Every button above goes straight to the business; any quote, contract, warranty or dispute is between you and them. Confirm licence and insurance and get it in writing before work starts — terms.
Greely too. Greely (K4P) is eight kilometres east along Mitch Owens Road and on the same wells and septic; most of the businesses on this page serve it as well as Manotick — say "Greely" when you call and confirm any travel charge. For the trades with a yard or office in Greely itself, see contractors based in Greely.
Who is the best radon testing company in Manotick?
Short answer: Testing and mitigation are two different jobs and two different certifications, so start with which one you need. If you have never tested, a long-term kit is the cheap first step and RadonTest.ca posts one for $75. If a test has already come back at or above 200 Bq/m³, you need a C-NRPP mitigation professional, which is what 613Environmental and Ottawa Radon Expert list. C-NRPP certifies people rather than companies, and measurement and mitigation are certified separately — look up the individual in the C-NRPP directory before you hire.
| Business | Based | Ownership | What sets them apart |
|---|---|---|---|
| RadonTest.ca | Nepean | Independent | Mail-in long-term kits at $75, using detectors that have passed C-NRPP performance testing and returned to a lab for a certificate of analysis. Testing only — no mitigation. |
| 613Environmental | Kinburn | Independent | Lists C-NRPP certification for both measurement and mitigation, so one company can test and then fix. Verify the individual's current certification in the C-NRPP directory. |
| Ottawa Radon Expert | Kanata | Independent | Also lists C-NRPP certification for measurement and mitigation. Same advice: check the named person in the C-NRPP directory before you book. |
A comparison of the three businesses this site would call first, on facts each publishes about itself — not a ranking of every radon contractor serving K4M, and not a rating. "What sets them apart" is our opinion, formed from the criteria we publish. No business has paid for a place in this table, and payment would not change it. Confirm licence and insurance directly before you hire.
What radon testing & mitigation costs in Manotick — 2026 rates
| Service or scope | Planning range |
|---|---|
| Long-term mail-in test kit (91+ days) | $60 – $100 |
| Professional long-term measurement | $150 – $350 |
| Short-term test (screening only) | $50 – $150 |
| Sub-slab depressurisation system, installed | $2,500 – $4,500 |
| Complex or multi-suction-point system | $4,500 – $7,500 |
| Post-mitigation verification test | $100 – $250 |
| Sump-pit sealing / crawlspace membrane | $800 – $3,000 |
| New-build rough-in (at construction) | $500 – $1,500 |
How long a test has to run, and when
Health Canada's action level is 200 becquerels per cubic metre, and the measurement that decides it is a long-term test spanning at least 91 days — Health Canada recommends 3 to 12 months for a reliable annual average. Two details matter and most summaries get them wrong. You can start a long-term test at any time of year. And for the most representative result, at least 91 days of the test should fall within the heating season, because that is when a closed-up house and the stack effect draw the most soil air in beneath the slab. So a test started in July is not wasted — run it long enough and it carries you into the heating season. What you should not do is act on a short summer measurement as though it were an annual average: if fewer than 91 heating-season days were covered and the result comes in below 200 Bq/m³, retest across the next heating season, because the annual average may be underestimated. A result of 200 Bq/m³ or higher from a valid long-term test is actionable whenever it was measured. Short-term tests have a place in a real-estate transaction where nobody has three months, but they screen rather than decide — and no hourly spike from a continuous monitor is a basis for a decision. Use the longest, most representative average you have.
What mitigation actually is
The standard fix is sub-slab depressurisation: a pipe through the basement floor into the gravel below, connected to a continuously running fan that vents above the roofline. It sounds crude and it is extremely effective — a properly designed system routinely takes a house from well above the action level to under 100 Bq/m³. Cost runs $2,500 to $4,500 for a straightforward installation, more where the footprint is broken up, there is a crawlspace, or multiple suction points are needed. Always pay for a post-mitigation verification test; a system that has been installed but never confirmed is a fan and a hope. If you are building or doing a major renovation, a rough-in at construction stage is a fraction of the retrofit cost.
The credential to ask for
C-NRPP — the Canadian National Radon Proficiency Program — is the national certification for radon professionals, and it certifies measurement and mitigation separately. Health Canada points to it as the accountability structure for homeowners, and some provinces have moved toward requiring it for paid work. It is the one credential worth checking before you hire, and it is a fair filter: a mitigator who is not certified is not someone you want cutting a hole in your foundation and altering the pressure regime of your house. Two distinctions worth carrying into the phone call. A person is certified; a device is not. A detector can have passed C-NRPP performance testing or be listed for a stated use — that is a product listing, not a professional credential, and a kit supplier is not a certified professional. And CARST membership is not C-NRPP certification: CARST is the industry association, and joining it is not the same as holding the proficiency certification. Check the name against the C-NRPP directory on the day you hire, for the specific scope — measurement, mitigation, or both.
Common questions
Who is the best radon testing company in Manotick?
Testing and mitigation are two different jobs and two different certifications, so start with which one you need. If you have never tested, a long-term kit is the cheap first step and RadonTest.ca posts one for $75. If a test has already come back at or above 200 Bq/m³, you need a C-NRPP mitigation professional, which is what 613Environmental and Ottawa Radon Expert list. C-NRPP certifies people rather than companies, and measurement and mitigation are certified separately — look up the individual in the C-NRPP directory before you hire.
What is the radon action level in Canada?
200 becquerels per cubic metre, set by Health Canada. Above that, Health Canada recommends remediation — within two years above 200, and within one year above 600. There is no level considered entirely risk-free, so many people mitigate below 200 as well.
How much does radon testing cost?
A long-term mail-in test kit runs $60 to $100 and is the sensible starting point for a homeowner. Professional long-term measurement is $150 to $350. Short-term tests at $50 to $150 screen quickly but do not give you a number you should act on.
How much does radon mitigation cost in Ottawa?
A standard sub-slab depressurisation system runs $2,500 to $4,500 installed. Complex homes needing multiple suction points, or with crawlspaces requiring a sealed membrane, run $4,500 to $7,500. Budget another $100 to $250 for the post-mitigation verification test, which is not optional if you want to know it worked.
When should I test for radon?
You can start a long-term test at any time of year — Health Canada asks for a measurement spanning at least 91 days, and recommends 3 to 12 months. For the most representative number, at least 91 of those days should fall in the heating season, when levels are typically highest. If your test covered fewer than 91 heating-season days and came back below 200 Bq/m³, retest across the next heating season, because the annual average may be underestimated. A long-term result at or above 200 Bq/m³ is worth acting on regardless of season.
What does C-NRPP mean and does it matter?
The Canadian National Radon Proficiency Program — Canada's national certification for radon professionals, with separate certification for measurement and for mitigation. Health Canada points to it as the accountability structure available to homeowners. It is the credential worth checking before hiring anyone to test or mitigate for pay.
Is radon a problem in the Manotick area?
Eastern Ontario is an elevated-potential region, and rural homes are not exempt — if anything, homes on their own foundations with basements and sumps have plenty of pathways. But potential maps tell you about a region, not a house. Two homes on the same road can differ by a factor of ten, which is exactly why testing is the only answer.