C-NRPP Certified Radon Companies in Thunder Bay
Every company holding current Canadian National Radon Proficiency Program certification that is based in Thunder Bay, or that names Thunder Bay 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 Thunder Bay Area, 5
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
Northern Home Designs
measurementmitigationcommercial measurementcommercial mitigation
Serves Thunder Bay (their own stated coverage)
Radon Safe Northwest Ltd.
measurementmitigationcommercial mitigation
Serves Thunder Bay (their own stated coverage)
Certified to Measure Only
Stantec Consulting
Based in Thunder Bay, Ontario
measurementcommercial measurement
Stephen Vares
Based in Thunder Bay, Ontario
measurement
TBT Engineering
measurementcommercial measurement
Serves Thunder Bay and Northwestern Ontario (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 Thunder Bay 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.