Top-rated radon detection and reduction specialists.

Get matched with top radon detection and reduction specialists in Ontario, OR

Enter your zip and get matched with up to 5 pros

Need a pro for your radon detection and reduction project in Ontario, OR?

Select your specific project to find the pro for you.

Verified Reviews for Radon Detection And Reduction pros in Ontario, OR

*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

Find Radon detection and reduction specialists in Ontario

Avatar for Presidential Inspections, LLC
Presidential Inspections, LLC
4.1(
51
)

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
6 neighbors recently requested a quote
Recommended by79%of homeowners
Request Quote
Radon Detection and Reduction questions, answered by experts

No, radon mitigation systems do not decrease home value or make a home harder to sell. In areas where homes experience similar radon exposure risks, a radon mitigation system is viewed as an improvement. Potential homebuyers often opt to buy a home with a radon mitigation system already installed to reduce the risk of cancer for their families.

Abatement includes sealing entry points and venting with systems that reduce radon levels below recommended EPA limits. It is handled by certified professionals.

The cost for a radon mitigation system typically ranges from $800 to $1,500, with an average around $1,000. The final price depends on several factors, including the size of your home, the severity of the radon issue, and the type of system required. Your home's foundation type also significantly impacts the cost. For example, sealing and ventilating an unfinished basement might cost around $4,600, while encapsulating a crawl space without a foundation slab can range from $1,500 to $15,000.

If high radon levels are detected, steps include sealing entry points, installing a mitigation system, and retesting the air regularly to ensure reduced levels.

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.

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

From average costs to expert advice, get all the answers you need to get your job done.

See all articles