C-NRPP Certified Radon Companies in Ontario
All 99 companies holding current Canadian National Radon Proficiency Program certification across Ontario, sorted by what they are actually certified to do.
Every certified company is listed free, whether or not they know this page exists. Paid featured placements are marked Featured; nothing else on this page is paid for.
Read this first, because the official registry does not make this distinction and it matters. If a test came back high and you want it fixed, you need a company certified for residential mitigation. If you only want to find out where you stand, residential measurement is enough, and you can also buy a long-term test kit and do it yourself. Several firms below are engineering and consulting practices that work on commercial buildings and will not come to a house.
Residential Mitigation, 36 Companies
Certified to install a radon reduction system in a home. Most of these also test.
613environmental
measurementmitigationcommercial measurementcommercial mitigation
Serves Ottawa and Surrounding Area (their own stated coverage)
Advanced Basement Systems
measurementmitigationcommercial measurementcommercial mitigation
Serves Southwestern Ontario (their own stated coverage)
Alder Creek Inspections and Consulting
measurementmitigationcommercial measurementcommercial mitigation
Serves Waterloo Region and Guelph (their own stated coverage)
Basement Boss
measurementmitigationcommercial measurementcommercial mitigation
Serves Neustadt (their own stated coverage)
Budd Radon Services
measurementmitigationcommercial measurementcommercial mitigation
Serves Ottawa (their own stated coverage)
Canada Radon Inc.
measurementmitigationcommercial measurementcommercial mitigation
Serves Burlington, Hamilton, Niagara (their own stated coverage)
Canadensis Green Consulting Ltd.
Based in East York, Ontario
measurementmitigation
Chad Verplaetse
Based in Kenora, Ontario
mitigation
EXP Service Inc.
measurementmitigation
Serves London and Surrounding Area (their own stated coverage)
Geo Construction
measurementmitigationcommercial measurementcommercial mitigation
Kingston Radon Solutions
measurementmitigationcommercial measurementcommercial mitigation
Serves Kingston (their own stated coverage)
LEX Scientific Inc.
measurementmitigationcommercial measurementcommercial mitigation
Serves Guelph (their own stated coverage)
MITIGAIR
measurementmitigationcommercial measurementcommercial mitigation
Serves Ontario (their own stated coverage)
Mr. Radon
measurementmitigationcommercial measurement
Serves Greenbank (their own stated coverage)
Mr. Radon Inc.
measurementmitigationcommercial measurementcommercial mitigation
Serves Greenbank; Ontario; Kingston; Ajax; Owen Sound (their own stated coverage)
Northern Home Designs
measurementmitigationcommercial measurementcommercial mitigation
Serves Thunder Bay (their own stated coverage)
Ontario Radon Services
measurementmitigationcommercial measurementcommercial mitigation
Ottawa Radon Expert
measurementmitigationcommercial measurementcommercial mitigation
Radon Control Solutions
measurementmitigationcommercial mitigation
Radon Gas Guys
measurementmitigation
Serves Southern Ontario (their own stated coverage)
Radon Hero
Based in Ottawa, Ontario
measurementmitigation
Serves in Ottawa Region (their own stated coverage)
Radon Masters
measurementmitigation
Radon Ottawa - Gatineau
measurementmitigation
Serves Ottawa - Gatineau (their own stated coverage)
Radon PI
Based in Dundas, Ancaster, Burlington, Ontario
measurementmitigation
Serves Dundas (their own stated coverage)
Radon Pros Canada Inc.
measurementmitigation
Radon Rescue Ltd.
measurementmitigation
Radon Safe Northwest Ltd.
measurementmitigationcommercial mitigation
Serves Thunder Bay (their own stated coverage)
Radon Secure Kingston
measurementmitigation
Radon Works
measurementmitigationcommercial measurementcommercial mitigation
Serves Ottawa area and Across Canada (their own stated coverage)
RadonClean
measurementmitigationcommercial measurementcommercial mitigation
Serves Markham (their own stated coverage)
RBM Group Inc.
measurementmitigationcommercial measurementcommercial mitigation
Simon Air Quality
measurementmitigationcommercial measurement
Serves Ottawa and all of Ontario (their own stated coverage)
South West Radon Pros Inc.
measurementmitigation
Serves Kitchener, Waterloo, Cambridge, Guelph (their own stated coverage)
Sudbury Radon Solutions
Based in Sudbury, Ontario
measurementmitigationcommercial measurement
Serves Sudbury (their own stated coverage)
Windsor Radon
measurementmitigation
Residential Measurement Only, 55 Companies
Certified to measure radon in a home but not to install the fix. Several are home inspectors who test as part of an inspection, which is often how radon first comes up in a property sale.
Abdo Lahib
measurementcommercial measurement
Accurate Construction
measurement
Algoma Radon Testing
measurementcommercial measurement
Serves Elliot Lake (their own stated coverage)
AmeriSpec of Barrie, Orillia and Muskoka
measurementcommercial measurement
Serves Barrie (their own stated coverage)
Barrhaven Home Inspectors, Inc
measurement
Serves Ottawa (their own stated coverage)
BreathingEasy/8547408 Canada Inc.
measurement
Serves Thornbury (their own stated coverage)
Buller Crichton Environmental Inc.
measurementcommercial measurement
Serves Ottawa (their own stated coverage)
BWC Contracting Inc
Based in Carleton Place, Ontario
measurement
Canada Post
Based in Mississauga, Ontario
measurementcommercial measurement
Canary Radon Inc.
measurement
Chartrand Home Air Solutions
measurementcommercial measurement
Custom Build Standard Construction Corp.
Based in Richmond Hill, Ontario
measurementcommercial measurement
Daniel Jennings
Based in Stoney Creek, Ontario
measurementcommercial measurement
Serves Stoney Creek (their own stated coverage)
Dave Davidson
Based in Fonthill, Ontario
measurement
Doug Tarry Homes
measurement
Serves St. Thomas (their own stated coverage)
ECOH
measurementcommercial measurement
Serves GTA (their own stated coverage)
ECOH Management Inc.
measurementcommercial measurement
EHS Partnerships Ltd.
measurement
Serves Ottawa (their own stated coverage)
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
Frederick Breaks
Based in Sudbury, Ontario
measurement
Serves Sudbury (their own stated coverage)
Gianluca Greco
Based in Sault Ste Marie, Ontario
measurement
Guoyan Liu
Based in London, Ontario
measurement
Harmanjit Singh
Based in Brampton, Ontario
measurement
IES Consulting Group Inc.
measurementcommercial measurement
Serves Chatham (their own stated coverage)
JAM (2005) Enterprises
measurement
Serves London (their own stated coverage)
Kyro Mechanical
measurement
Marina Arutin Cavalcanti Albuquerque
measurement
Martech Group Inc.
measurementcommercial measurement
Serves Mississauga (their own stated coverage)
North Air Ventilation
measurement
Ottawa Valley Radon Solutions
measurement
Parham Salehi
Based in OTTAWA, Ontario
measurement
Pinchin Ltd.
measurementcommercial measurementcommercial mitigation
Serves Mississauga; Tilbury; Sudbury (their own stated coverage)
Property Systems Inspection
Based in Burlington, Ontario
measurement
Serves Toronto (their own stated coverage)
Radon Checks
measurementcommercial measurement
RadonSafeToronto
measurement
Ready Home Experts
measurement
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)
Rodon Emergency Management Inc.
Based in Kemptville, Ontario
measurementcommercial measurement
Serves Kemptville/Ottawa (their own stated coverage)
S2S Environmental Inc.
measurement
Safetech Environmental Ltd.
measurementcommercial measurementcommercial mitigation
Serves Residential Measurement, Mitigation, CRNCH; Kitchener (their own stated coverage)
Stantec Consulting
Based in Thunder Bay, Ontario
measurementcommercial measurement
Stephen Vares
Based in Thunder Bay, Ontario
measurement
T. Harris Environmental Management Inc.
measurementcommercial measurement
Serves London (their own stated coverage)
TBT Engineering
measurementcommercial measurement
Serves Thunder Bay and Northwestern Ontario (their own stated coverage)
The Ottawa Hospital
Based in Ottawa, Ontario
measurementcommercial measurement
Serves Ottawa (their own stated coverage)
Thorntin Macdonald
Based in Orangeville, Ontario
measurement
Todd Lance
Based in Petawawa, Ontario
measurement
Travis Valcourt
Based in Stittsville, Ontario
measurement
VIP Properties Management Ltd.
measurement
WSP Canada
measurementcommercial measurementcommercial mitigation
Serves GTA; Ottawa Region (their own stated coverage)
YUEFANG DENG
Based in Nepean, Ontario
measurementcommercial measurement
Commercial and Industrial Only, 8 Companies
Certified for commercial buildings. Listed for completeness; not who a homeowner calls.
BGIS
commercial measurementcommercial mitigation
Serves Markham (their own stated coverage)
BluMetric Environmental Inc.
commercial measurementcommercial mitigation
Serves GTA & Canada-Wide (their own stated coverage)
Bruce Decker
commercial measurementcommercial mitigation
Serves Markham (their own stated coverage)
Geosyntec Consultants
commercial measurementcommercial mitigation
Serves Guelph (their own stated coverage)
InAIR Environmental Ltd.
commercial measurement
OHE Consultants
commercial measurementcommercial mitigation
Serves Mississauga; in Mississauga (their own stated coverage)
Radiation Safety Institute of Canada, National Laboratories
commercial measurement
Serves GTA (their own stated coverage)
WSP Canada Inc.
commercial measurementcommercial mitigation
How This List Is Put Together
Every company here holds current certification with the Canadian National Radon Proficiency Program, which is the only radon certification recognised in Canada. The list is taken from C-NRPP's own public directory and grouped by the certifications each company actually holds. It is ordered alphabetically within each group.
Every certified company is listed here free, and the free listings are ordered alphabetically rather than by anything we were paid for. Where a company has taken a featured placement it is marked Featured, clearly, in the listing itself, so you always know which is which. Anything unmarked is here because it holds the certification, not because it paid.
This page does not rank companies by quality, because we have not assessed their work and it would be dishonest to imply otherwise. Certification tells you someone has been trained and tested to a national standard. It does not tell you what they are like to deal with. Ask for references and get more than one quote, the same as you would with any trade.
Something wrong, missing, or out of date? Tell us and it gets fixed.
See also: the Ontario radon map, and what counts as a safe level.