C-NRPP Certified Radon Companies in Guelph

Every company holding current Canadian National Radon Proficiency Program certification that is based in Guelph, or that names Guelph 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 Guelph Area, 2

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

LEX Scientific Inc.

Based in Guelph, Ontario · website
measurementmitigationcommercial measurementcommercial mitigation
Serves Guelph (their own stated coverage)

Certified to Measure Only

Geosyntec Consultants

Based in Guelph, Ontario · website
commercial measurementcommercial mitigation
Serves Guelph (their own stated coverage)

Cover Guelph from Elsewhere in Ontario, 2

Based somewhere else, but Guelph appears in the service area they gave the registry themselves.

Certified to Install the Fix

Alder Creek Inspections and Consulting

Based in New Dundee, Ontario · website
measurementmitigationcommercial measurementcommercial mitigation
Serves Waterloo Region and Guelph (their own stated coverage)

South West Radon Pros Inc.

Based in Kitchener, Ontario · website
measurementmitigation
Serves Kitchener, Waterloo, Cambridge, Guelph (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 Guelph 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.