Newmarket radon testing and mitigation
87,942 residents. ~1 in 20 homes test above the Health Canada radon guideline.
Why Newmarket homeowners test
Newmarket combines a historic downtown core (Main Street stone and brick homes from the 1800s and early 1900s) with newer subdivisions east and west along Davis Drive and Yonge Street. York Region's glacial till geology keeps baseline radon moderate, but older downtown homes with stone foundations and finished basements can still test above the Health Canada guideline.
Our Newmarket service
- Testing: $99 (standard) or $399 (real estate)
- Mitigation: $2,800 to $3,800 preliminary estimate 3
- Typical scheduling: within 3-5 business days
- Same-week availability most months
Newmarket-specific questions
Do you service all of Newmarket?
Yes. Every Newmarket neighbourhood including downtown Newmarket, Stonehaven, Summerhill Estates, Glenway, Woodland Hill, Armitage, Quaker Hill, Bristol-London, and Copper Hills. Same $99 testing price, no distance surcharge.
Which Newmarket neighbourhoods test highest for radon?
The historic downtown core (Main Street area, Stonehaven, Quaker Hill) includes many 1800s to early 1900s homes with stone or rubble foundations and basement living space, conditions that favour radon accumulation. Newer Glenway, Woodland Hill, and Copper Hills subdivisions test lower on average but can still spike in individual homes due to airtight modern construction.
My Newmarket home is a post-2021 build in Woodland Hill, Copper Hills, or Stonehaven. Tarion coverage?
Yes if you purchased from a builder on or after Feb 1, 2021 and your home is within its 7-year Tarion warranty. Newmarket's recent infill and subdivision growth is squarely in this window. C-NRPP certified test at or above 200 Bq/m³ triggers builder-funded mitigation up to $50,000.
Is Newmarket's radon profile similar to other York Region cities like Aurora or Richmond Hill?
Yes. Newmarket sits on the same glacial-till-over-Precambrian-Shield geology as Aurora, Richmond Hill, Markham, and most of York Region. Baseline radon is moderate (around 45 Bq/m³ on average), with about 1 in 20 homes testing above the 200 Bq/m³ guideline. Individual homes still vary widely, especially older homes with permeable foundations.
About these numbers
Population and home counts come from Statistics Canada's 2021 Census of Population 1 . These are exact figures.
The per-city radon percentage is a synthesis estimate, not a number pulled directly from any single source. We blend three datasets: Health Canada's Cross-Canada Survey of Radon Concentrations in Homes (the 2012 federal baseline) 4 , the University of Calgary's Evict Radon citizen-science mapping project 2 , and Take Action on Radon's aggregated municipal data 5 .
The federal baseline often reports lower above-guideline rates than the newer citizen-science projects. Two reasons: the federal study is now 14+ years old, and the newer citizen-science projects sample more aggressively in homes built under tighter modern building codes (which trap soil gas more effectively than older draftier construction). Where these sources disagree on a specific municipality, our published percentage lands on a working midpoint. So if you click through to the federal survey expecting to find "Newmarket ~5%" verbatim, you won't. The federal survey may report a lower figure for the same area, and the citizen-science maps often report a higher one. We chose the midpoint because no single source is definitive.
None of this gives you a definitive percentage for your specific home. Two homes on the same street can test 30 Bq/m³ apart. The only reliable answer for your home is a test on that home.
References
- 1.Statistics Canada. Census Profile, 2021 Census of Population↗ (2022)↩
- 2.Evict Radon. Evict Radon National Study↗↩
- 3.Health Canada. Government of Canada Radon Guideline↗↩
- 4.Health Canada. Cross-Canada Survey of Radon Concentrations in Homes: Final Report↗ (2012)↩
- 5.Canadian Association of Radon Scientists and Technologists (CARST). Take Action on Radon↗↩
See our full research bibliography at /sources.