Best Radon Testing & Mitigation in Guelph
About Radon in Guelph, Ontario
Last updated: March 2026
Guelph is served by C-NRPP certified radon professionals listed on RadonFinder.ca. Ontario has widely varying radon risk depending on geography. The Ottawa Valley, eastern Ontario, and areas underlain by the Canadian Shield, including parts of Sudbury, Elliot Lake, and the Bancroft region, have elevated radon due to uranium-rich granite bedrock. Southern Ontario's clay and limestone geology generally produces lower levels, though local hotspots exist in any region. The 2024 Cross-Canada survey found about 13% of Ontario homes exceed the guideline.
Typical Mitigation Cost in Ontario
Near national average
Costs vary significantly between the GTA, Ottawa, and northern Ontario due to labour markets and home construction types.
- •Foundation type: poured concrete, block, or slab
- •Basement finish level: unfinished installs are faster and cheaper
- •Pipe routing complexity in finished or split-level homes
- •GTA vs. rural Ontario labour rate differences
- •Age of home: older homes may require additional sealing work
Showing 1–16 of 24 professionals in Guelph
LEX Scientific Inc.
C-NRPP Certified staff in Guelph, ON, provides radon testing, measurement, and mitigation services. Offers residential radon test kits. Established 1981.
Geosyntec Consultants
Geosyntec Consultants is a C-NRPP certified radon testing and mitigation professional serving Guelph, ON. They offer complete radon solutions from initial testing through to mitigation system installation.
South West Radon Pros Inc.
Offers C-NRPP certified radon testing, mitigation, and DIY fix solutions. Serving Kitchener, Waterloo, Cambridge, Guelph, and surrounding areas, they guarantee reduced radon levels in residential settings.
Rival Home Inspections
Offers radon services. Serves Ajax, ON, Toronto, Durham, York, Peel, Halton, Simcoe, Brant, Dufferin, Kawartha Lakes, Hamilton, Waterloo, Peterborough, and all GTA Regions.
Radon Gas Guys
Provides C-NRPP certified radon testing, mitigation, and removal services with a 100% guarantee for homes in Kitchener, Waterloo, Guelph, Hamilton, and Burlington. Offers free 91-day test kits.
Borts Home and Energy
Borts Home and Energy is a C-NRPP certified radon testing and mitigation professional serving Etobicoke, ON. They offer complete radon solutions from initial testing through to mitigation system installation.
BluMetric Environmental Inc.
BluMetric Environmental Inc. is a C-NRPP certified radon testing and mitigation professional serving Kitchener, ON. They offer complete radon solutions from initial testing through to mitigation system installation.
The Bearstar Group Inc
Offers hazardous material abatement services including radon solutions for commercial, industrial, and institutional buildings. Provides identification, removal, and disposal with 25+ years expertise.
Expert Plumbing and Drains Inc
A full-service plumbing and drain company offering heating and radon services. Brings over 80 years of combined experience to homeowners and custom home builders.
ECOH Management Inc.
ECOH Management Inc. is a C-NRPP certified radon testing professional serving Toronto, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.
Canada Post
Canada Post is a C-NRPP certified radon testing professional serving Mississauga, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.
WSP Canada
WSP Canada is a C-NRPP certified radon testing and mitigation professional serving Etobicoke, ON. They offer complete radon solutions from initial testing through to mitigation system installation.
The Radiation Safety Institute of Canada's National Laboratories in Toronto offer radiation safety training and lab services. For radon, it runs a radon chamber and CRM calibration for professionals and no longer offers home radon testing to the public.
ECOH
ECOH is a C-NRPP certified radon testing professional serving Mississauga, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.
Martech Group Inc.
Martech Group Inc. is a C-NRPP certified radon testing professional serving Mississauga, ON. Their certified inspectors provide accurate radon measurements for homes and businesses.
Accurate Construction
Accurate Construction Ltd. mainly repairs basement foundation cracks from inside using polyurethane injection, and also installs radon mitigation systems to lower indoor radon levels. It serves over 30 Ontario communities from Hamilton to Barrie and Vaughan to Oshawa.
Local radon data
How common is high radon in Guelph?
1 in 6
homes tested in the Guelph area had radon above Health Canada's action level of 200 Bq/m³. Your home can be very different from its neighbours, so the only way to know your level is to test.
Postal areas nearby with the highest estimates
102 homes tested in the 2024 Cross-Canada survey. Source: the RadonFinder.ca radon map of Canada, built on the 2024 Cross-Canada survey, Health Canada data and Statistics Canada census data.
Open Guelph on the radon mapTest before you call a pro
Know your radon level in Guelph first
A home monitor tells you whether you need mitigation at all, and later confirms it worked. Health Canada bases decisions on a 3-month average, ideally through winter.
Compare all detectors · As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Frequently Asked Questions: Radon in Guelph
Browse Nearby Cities in Ontario
Other areas with radon professionals
Are you a radon professional in Guelph? Claim and verify your free listing.
Learn more →Radon Resources for Guelph
Tools and guides to help you understand radon risk and take action.