Richmond Hill radon testing and mitigation
202,022 residents. 1 in 20 homes test above the Health Canada radon guideline.
Why Richmond Hill homeowners test
Richmond Hill's hillside geography along Yonge Street creates variable soil conditions across the city. Individual home testing is essential.
Our Richmond Hill 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
Richmond Hill-specific questions
Do you service all of Richmond Hill including Oak Ridges?
Yes. Every Richmond Hill neighbourhood including Oak Ridges, Mill Pond, Bayview Hill, Jefferson, Westbrook, Devonsleigh, Crosby, and the Yonge Street corridor. Same $99 pricing, no distance surcharge.
Does Richmond Hill's hillside geography actually affect radon?
It can. Hillside lots often have varying depth of soil cover and irregular foundation contact with bedrock, which means radon entry paths differ even between adjacent properties. Two Richmond Hill homes on the same street can test very differently. The only reliable answer is a test on each specific home.
Which Richmond Hill neighbourhoods test highest?
Older Mill Pond and Crosby homes from the 1960s and 1970s with stone or block foundations and finished basements tend to top the list. Newer Bayview Hill and Oak Ridges homes from the 2000s and 2010s have tighter envelopes which can also produce surprisingly high readings if soil-level gas is present.
My Richmond Hill home is a recent build in Jefferson, Oak Ridges, or Westbrook. Tarion radon coverage?
Yes if purchased from a builder on or after Feb 1, 2021 and within the 7-year Tarion warranty. Many of Richmond Hill's newest subdivisions fall in this window. C-NRPP certified test at or above 200 Bq/m³ triggers builder-funded mitigation up to $50,000.
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 "Richmond Hill 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.