C-NRPP Certified Radon Companies in Toronto and the GTA
Every company holding current Canadian National Radon Proficiency Program certification that is based in Toronto and the GTA, or that names Toronto and the GTA in its own service area. Listed free, whether or not they know this page exists.
Two lists, because the difference is a fact and the alternative is a guess. The first is companies whose registered address is here. The second is companies based elsewhere in Ontario that state they cover this area. We do not assume that a firm in one town serves the next one over, so if you do not see enough names, the
full Ontario list has everyone.
Based in the Toronto and the GTA Area, 22
Their registered address with C-NRPP is in this area. The town on each card is the one they gave the registry.
Certified to Install the Fix
RadonClean
measurementmitigationcommercial measurementcommercial mitigation
Serves Markham (their own stated coverage)
RBM Group Inc.
measurementmitigationcommercial measurementcommercial mitigation
Certified to Measure Only
BGIS
commercial measurementcommercial mitigation
Serves Markham (their own stated coverage)
Bruce Decker
commercial measurementcommercial mitigation
Serves Markham (their own stated coverage)
Canada Post
Based in Mississauga, Ontario
measurementcommercial measurement
Canary Radon Inc.
measurement
Custom Build Standard Construction Corp.
Based in Richmond Hill, Ontario
measurementcommercial measurement
ECOH
measurementcommercial measurement
Serves GTA (their own stated coverage)
ECOH Management Inc.
measurementcommercial measurement
Energy Home Service Corp.
measurementcommercial measurement
Serves Vaughan, Richmond Hill, Aurora, Newmarket, King city, Bolton, Markham (their own stated coverage)
Expert Plumbing and Drains Inc
Based in Burlington, Ontario
measurementcommercial measurement
Harmanjit Singh
Based in Brampton, Ontario
measurement
Marina Arutin Cavalcanti Albuquerque
measurement
Martech Group Inc.
measurementcommercial measurement
Serves Mississauga (their own stated coverage)
OHE Consultants
commercial measurementcommercial mitigation
Serves Mississauga; in Mississauga (their own stated coverage)
Property Systems Inspection
Based in Burlington, Ontario
measurement
Serves Toronto (their own stated coverage)
Radiation Safety Institute of Canada, National Laboratories
commercial measurement
Serves GTA (their own stated coverage)
Rival Home Inspections
measurementcommercial measurement
Serves Greater Toronto Area (their own stated coverage)
RnP
Based in Markham, Ontario
measurement
Serves GTA (their own stated coverage)
S2S Environmental Inc.
measurement
WSP Canada
measurementcommercial measurementcommercial mitigation
Serves GTA; Ottawa Region (their own stated coverage)
WSP Canada Inc.
commercial measurementcommercial mitigation
Cover Toronto and the GTA from Elsewhere in Ontario, 3
Based somewhere else, but Toronto and the GTA appears in the service area they gave the registry themselves.
Certified to Install the Fix
Canada Radon Inc.
measurementmitigationcommercial measurementcommercial mitigation
Serves Burlington, Hamilton, Niagara (their own stated coverage)
Mr. Radon Inc.
measurementmitigationcommercial measurementcommercial mitigation
Serves Greenbank; Ontario; Kingston; Ajax; Owen Sound (their own stated coverage)
Certified to Measure Only
Pinchin Ltd.
measurementcommercial measurementcommercial mitigation
Serves Mississauga; Tilbury; Sudbury (their own stated coverage)
What the Two Certifications Mean
C-NRPP certifies separately for measurement, finding out what a home reads, and for mitigation, installing the system that fixes it. Plenty of companies hold only one. If a test has come back high, you want a company on the first list above.
See also: the Toronto and the GTA radon map, every certified company in Ontario, and what counts as a safe level.
Certification data from the Canadian National Radon Proficiency Program public registry, read on 5 September 2026. Service areas are each company's own words. Nothing on this page is paid for.