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*The Angi rating for Radon Detection And Reduction companies in Ontario, OR is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

*The HomeAdvisor rating for Radon Detection And Reduction companies in Ontario, OR is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Radon Detection And Reduction needs.

Last update on January 20, 2026

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Avatar for Presidential Inspections, LLC
Presidential Inspections, LLC
4.1(
51
)
Radon Gas - Testing

Serving Ontario, OR and surrounding areas

Approved

In business since 2004

Free estimates

Small jobs welcome

"Craig Burton, the person who responded to my call and conducted the air quality testing was highly professional and enlightened me about the process from start to finish. Beyond the actual samples taken indoors and outside my home to set up the differential readings needed, he took moisture & thermal readings in the area of concern. I felt confident when samples were sent off that mine would not be confused with anyone elseâ s and that the manner in which they were conducted would assure accurate testing."
Improperl Installed Insualtion
Visible Mold
Frozen Pipes
No vapor barrier in the crawl space
Worn Roof

+3

Response time8 hrs
8 neighbors recently requested a quote
Recommended by79%of homeowners
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Radon Detection and Reduction questions, answered by experts

The soil beneath your house is most likely what’s causing an increased level of radon. This is because soil holds radioactivity for a long time and it’s also what most buildings are built on. Another common source of radon is water from a source that hasn’t been through periodic radon tests, such as well water. Over time, the radon from the soil can inhabit other parts of your house like the foundation or plumbing.

Radon enters your home when warm air begins to rise and exits through the roof, creating a vacuum that pulls cooler air from under the foundation. Part of that air is radon, which is an invisible, odorless gas that develops naturally when radioactive particles are deep within the ground. Those particles usually come from decaying matter in soil and rocks.

No level of radon is technically safe, but since it is naturally present everywhere, it is impossible to avoid entirely. The average radon level in homes across the United States is 1.3 picocuries per liter (pCi/L). The Environmental Protection Agency (EPA) recommends taking action to reduce radon levels if your home's test results are between 2 and 4 pCi/L or higher.

Your radon fan needs to operate 24/7 to be effective. The only time the fan isn't operating is during its replacement. Radon levels in the home can increase within hours if the fan stops working or something obstructs the stack vent. Fortunately, radon systems require no downtime maintenance between fan changes.

Radon is present almost everywhere but, like sunlight, the concentration levels and how often you are exposed to it have a large part to play in just how dangerous it is. There are levels of radon that are acceptable inside a house, but above a certain limit, radon becomes a serious radioactive hazard that is a known cause of lung cancer. In fact, radon exposure is the number two leading cause of lung cancer (after smoking).

The Ontario, OR homeowners’ guide to radon detection and reduction services

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