Radon gas could be present in your Guelph home - and you may not even know it. In fact, a recent study conducted by Health Canada found that 1 in 5 homes in Guelph contained dangerously high levels of radon gas, the second leading cause of lung cancer after smoking.

Radon is a tasteless, odourless, naturally occuring gas found in the environment. This radioactive gas can leak into your home through soil, rock and groundwater, and with elevated levels along the Niagara Escarpment, Guelph has some of the highest levels of radon in Canada. The only way to be sure that the levels of radon in your home are safe is to test – and with historically elevated levels, radon gas testing in Guelph is highly encouraged.

How To Test for Radon Gas

Due to the elevated levels of radon in Guelph, Ontario, the city of Guelph has launched the “Radon Gas Mitigation Program”. As part of the program, new homes may be subject to mandatory radon gas testing by a C-NRPP certified technician as of 2015. 

radon map ontario

Although not all new homes will be subject to this testing, Health Canada recommends that all homes – both new builds and those built before 2015 – undergo radon gas testing.

“According to results from residential surveys completed by Health Canada, 18% of the randomly tested buildings within the City of Guelph exceed Canada’s recommended guideline for radon gas.” - The City of Guelph

Testing for radon gas is simple. At Radon Gas Guys, we are pleased to offer free, 91 day radon test kits including a dosimeter that will record the average level of radon in your home or commercial space over a 3-12 month period. Following the testing period, you will receive a full lab report with details on radon levels. If your home shows minimal levels,  we will refund you the full purchase price. If your home does in fact contain elevated levels of radon, we will perform mitigation and refund you the cost of initial testing.

How Radon Enters Your Home

When uranium in soil, rock and water breaks down, radon gas can begin seeping into homes and buildings through cracks and holes in the floor or foundation. It may also enter through drains or spaces around pumps. 

how radon gas enters your home


When radon is confined to spaces that are enclosed or poorly ventilated, it can accumulate to dangerous levels. Areas such as basements and crawl spaces typically have the highest levels of radon as they are closest to the source.

My home has elevated levels of radon. Now what?

If you suspect or have confirmed that your home has elevated radon levels, it needs to be mitigated by professionals. At Radon Gas Guys, our C-NRPP certified technicians are experienced at installing effective radon mitigation systems. We are confident that our systems work – and if they do not reduce the levels in your home below the Canadian standard, we will correct it at no cost or refund your money.

Contact Radon Gas Guys for an evaluation of your home in Guelph, Ontario or the surrounding area today and restore your peace of mind.