Top-rated radon detection and reduction specialists.

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

Enter your ZIP and get matched with up to 5 pros

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

Select your specific project to find the pro for you.

Verified Reviews for Radon Detection And Reduction pros in John Day, OR

*The Angi rating for Radon Detection And Reduction companies in John Day, 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 John Day, 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 November 17, 2025

Find Radon detection and reduction specialists in John Day

EnviroLead, LLC

5.00(
2
)

EnviroLead, LLC

5.00(
2
)
Customers say: Quick response
Recommended by 100% of Angi customers
Recommended by 100% of HomeAdvisor customers

Lead Based Paint Inspection using XRF, Mold Inspection, Radon testing. Serving All of Oregon for Lead Based Paint Inspection Business Hours: 8:00-6:00 Monday-Friday, Available Evenings, Weekends, Holidays and during all major sporting events! (by appointment) Accessible 24/7 by live Answering Service. //· 15 Years in building related fields. //· 4 years International Code Council Special Inspector //· 3 years teaching Structural Special Inspection, Estimating, Project Management, and Plan reading. //· Oregon Certified Home Inspector #1130 //· I.C.C. Certified Special Inspector- Structural Masonry #5114180-84 //· I.C.C. Certified Special Inspector- Structural Steel and Welding # 5116939-85 //· I.C.C. Certified Special Inspector- Reinforced Concrete # 5116939-47.

Lead Based Paint Inspection using XRF, Mold Inspection, Radon testing. Serving All of Oregon for Lead Based Paint Inspection Business Hours: 8:00-6:00 Monday-Friday, Available Evenings, Weekends, Holidays and during all major sporting events! (by appointment) Accessible 24/7 by live Answering Service. //· 15 Years in building related fields. //· 4 years International Code Council Special Inspector //· 3 years teaching Structural Special Inspection, Estimating, Project Management, and Plan reading. //· Oregon Certified Home Inspector #1130 //· I.C.C. Certified Special Inspector- Structural Masonry #5114180-84 //· I.C.C. Certified Special Inspector- Structural Steel and Welding # 5116939-85 //· I.C.C. Certified Special Inspector- Reinforced Concrete # 5116939-47.

Cascade Radon Inc

4.94(
157
)

Cascade Radon Inc

4.94(
157
)
Customers say: Super punctual
Recommended by 99% of Angi customers
Recommended by 99% of HomeAdvisor customers

The Northwest's most experienced firm. Residential and commercial radon testing, mitigation, and system design for homes, schools, businesses. Radon-resistant design for new homes. We have been EPA-certified for over 25 years. Award winning. Radon is not a secondary endeavor for us… it’s all we do.

"Excellent from beginning to end. Very professional outfit from initial visit, quote, scheduling, work, followup. Price was reasonable, work quality went above and beyond, and radon levels dropped well below even the contractual level."

Claude S on April 2021

The Northwest's most experienced firm. Residential and commercial radon testing, mitigation, and system design for homes, schools, businesses. Radon-resistant design for new homes. We have been EPA-certified for over 25 years. Award winning. Radon is not a secondary endeavor for us… it’s all we do.

"Excellent from beginning to end. Very professional outfit from initial visit, quote, scheduling, work, followup. Price was reasonable, work quality went above and beyond, and radon levels dropped well below even the contractual level."

Claude S on April 2021

Avatar for Environmental Testing & Research Laboratories, Inc

Environmental Testing & Research Laboratories, Inc

4.85(
347
)

Environmental Testing & Research Laboratories, Inc

4.85(
347
)
Customers say: True professional
Recommended by 93% of Angi customers
Recommended by 93% of HomeAdvisor customers

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

Radon Detection and Reduction questions, answered by experts

A DIY kit can lessen the sting that comes with paying for a professional assessment, but these comprehensive tests are true lifesavers. Inspectors are more likely to catch all of the pollutants and hazards in your air. Plus, you’ll still need a professional to verify and act on your DIY test results. 

Some kits don’t include tests for certain air pollutants or only detect their presence, but not their levels (i.e., mold spores). If you’re willing to shell out money for a DIY kit, it’s usually better to stretch your budget slightly higher for a more detailed assessment.

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

The natural breakdown of uranium in soil, rock, and water can cause radon to appear in a home. The gas seeps into homes through cracks in foundations, walls, or floors, as well as through gaps around pipes or construction joints. Radon levels are influenced by soil composition, building materials, and ventilation. Poorly sealed or airtight homes can trap radon, allowing it to accumulate.

Professional radon detection involves placing test kits in the lowest lived-in level of the house for a period, usually 48 hours to several months, followed by lab analysis of collected data.

Long-term exposure increases lung cancer risks. Prolonged homestay individuals and smokers encounter heightened vulnerability and exposure concerns.

The John Day, 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