Town
C-NRPP certified radon testing and mitigation businesses with an office in Richmond Hill, Ontario, and the 2024 survey figure for its census division, dated.
Photo: Ian Furst, CC BY-SA 3.0, cropped, via Wikimedia Commons.
4
%About 1 in 25 properties
Share of properties in the York census division, which includes Richmond Hill, with radon at or above 200 Bq/m³ in the 2024 Cross-Canada Radon Survey. The survey reports no figure for Richmond Hill itself.
1
Businesses with a business address in Richmond Hill and at least one active C-NRPP credential, as of 2026-10-18. Providers based elsewhere may also serve Richmond Hill.
Sorted alphabetically by business name. Every C-NRPP certified business is listed free, and payment never affects the order.
C-NRPP
Service area
Not listed in the registry
Last registry check
Certified providers near Richmond Hill
Businesses for hire with an active C-NRPP credential and an office elsewhere in the York census division, placed by postal code area. Rural postal areas, which can span several divisions, are left out, so this list may miss a rural business.
Sorted alphabetically by business name. Every C-NRPP certified business is listed free, and payment never affects the order.
| Business | Town | Services |
|---|---|---|
| BGIS | Markham | Measurement, Mitigation, New construction (CRNCH) |
| RadonClean | Markham | Measurement, Mitigation |
| RnP | Markham | Measurement |
C-NRPP, Find a Professional directory: every province and territory searched for each of the six service types, de-duplicated by the registry's person id. Pulled on 2026-10-18. Census divisions by postal code area, adapted from Statistics Canada, 2021 Census forward sortation area and census division boundary files; not an endorsement by Statistics Canada.
Grant
Up to $1,500 toward home radon mitigation. Radon is named as eligible. Current. As of 2026-09-01.
Forgivable loan
Varies by service manager, roughly $15,000 to $25,000. Radon is not named. Varies by service manager. As of 2026-09-18.
Warranty coverage
Up to $50,000 where the Agreement of Purchase and Sale was signed after 1 February 2021, otherwise $15,000. Radon is named as eligible. Current for qualifying homes. As of 2026-09-18.
Free or subsidized testing
Radon is named as eligible. Current. As of 2026-09-18.
Province or territory
Radon by census division, and every certified provider in Ontario.