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Q: What if radon is still high after mitigation?

• <div><p>You'll need to test your home for radon after installing the mitigation system, then again every two years. If radon remains elevated, contact a licensed radon professional, either the contractor who installed the system or a different one, and have them evaluate the system. They may need to make some changes to improve its effectiveness and performance.</p></div>

Q: Is radon a serious problem?

• <div><p>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).</p></div>

Q: How does radon enter my home?

• <div><p>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.</p></div>

Q: What types of radon mitigation systems are available?

• <div><p>Options include sub-slab depressurization, crawlspace ventilation, and sealing cracks. Choose based on home construction and radon levels.</p></div>

Q: Why is radon gas abatement necessary for homes?

• <div><p>Radon is a cancer-causing radioactive gas that poses serious health risks, infiltrating homes through foundation cracks and unnoticed spaces.</p></div>

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Verified Reviews for Radon Detection And Reduction pros in Maryville, MO

*The Angi rating for Radon Detection And Reduction companies in Maryville, MO 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 Maryville, MO 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 August 02, 2026

Reviewed in August 2026
John was very professional and efficient. He was able to get to us fairly quickly. He explained what he needed to do and approximately how long it would take. He also came back a few weeks later and cleaned and sanitized the area, which was helpful to my husband and I.
Bat Pro's
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Reviewed in May 2025
Savage Renovations was very professional, organized, and overall just great to work with! They have done numerous projects for me over the years. Whether it’s a new roof, interior/exterior painting, installing flooring and installing cabinets! DJ is very quick to respond and makes everything....
Savage Renovations, LLC
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Reviewed in May 2025
I?m 76 years old and this was one of the best roofing jobs I?ve seen. The crew did solid work, were respectful, and the metal roof looks great. I?m very satisfied.
ROOFING RIGHT, LLC
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Reviewed in September 2023
Great company to have work done in your home. Very polite and knowledgeable.
National Radon Defense Midwest
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Reviewed in July 2023
They did a great job on setting up the pool. The only problem we had was the pump was leaking so we changed out the fitting. Other than that they completed the project in one day and the pool is level. Highly recommend!!
Poolside Paradise
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Reviewed in January 2023
Could not ask for better service. The company did exactly what and when they said they would. They kept me informed thru the whole process. Jim and Glen are expert craftsmen, take pride in their work and are very pleasant gentlemen. The whole process went great from start to finish. I highly...
Van Cleave Construction, Remodeling, & Design
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Reviewed in September 2022
He was very professional and used commercial grade equipment. He was on time and did the job quickly but with intense attention to detail. His services were worth every cent!
Walkers Pro Pressure Washing
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Reviewed in June 2022
Very professional and knowledgeable. Communication was great during each step of our project. My home is a very large 112 year old house. It was a big project. Juan and his team completed the project in 6 days! Workmanship is outstanding. Our home looks beautiful.
Continental Siding Supply, Inc.
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Reviewed in February 2021
this is the 4th project that I have used Foundation Recovery Systems for to repair my basement walls and the work is always spot on. On this project it was more wall anchors and Devon Brown and his crew did excellent work and were very informative about the work they were doing. They drove on...
Foundation Recovery Systems
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Find Radon detection and reduction specialists in Maryville

National Radon Defense Midwest

4.7(

)

Serving Maryville, MO and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"RADON SYSTEM WAS NOT WORKING. (Installed by another company years ago). The phone contact was pleasant and efficient. The Technician came on the agreed day and the agreed time: he explained what was wrong, explained the options, then repaired the system so it is working better than it did when first installed."

Crawlspace Encapsulation with Radon Mitigation

+15

Response time1 day

45 neighbors recently requested a quote

Recommended by96%of homeowners

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SWAT Environmental, Inc.

4.5(

)

Serving Maryville, MO and surrounding areas

In business since 1988

Free estimates

Credit card accepted

"I would definitely recommend this company to anyone!!! I hired them and the job was done nicely, Dan O'Brien was the technician who took care of the project and he did an excellent job, he answered all of my questions and explained to me everything related to Radon gas. When he finished setting everything up and the job was completed all the working area looked super clean and the installation looks just like it is part of the house and that has been there forever. This is what I call a Perfect and Complete execution of a Radon gas mitigation project."

Recommended by97%of homeowners

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The Environmental Guys LLC

New to Angi

Serving Maryville, MO and surrounding areas

In business since 2025

Free estimates

Emergency services offered

We test for several different hazardous materials and gas. We also off mold & mildew surface removal and cleaning with environmental friendly cleaners. We do offer free quotes and consulting on remedies for issues to your home or business.

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Radon Detection and Reduction questions, answered by experts

You'll need to test your home for radon after installing the mitigation system, then again every two years. If radon remains elevated, contact a licensed radon professional, either the contractor who installed the system or a different one, and have them evaluate the system. They may need to make some changes to improve its effectiveness and performance.

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).

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.

Options include sub-slab depressurization, crawlspace ventilation, and sealing cracks. Choose based on home construction and radon levels.

Radon is a cancer-causing radioactive gas that poses serious health risks, infiltrating homes through foundation cracks and unnoticed spaces.

The Maryville, MO 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

Mitchell Grant
•
Mar 18, 2026Mar 18, 2026
How Much Does a Radon Mitigation System Cost? [2026 Data]
The cost of a radon mitigation system depends mostly on the type of system being installed. Use this guide to learn about your options.
Alison Kasch
•
Apr 6, 2026Apr 6, 2026
How Much Does Radon Remediation Cost? [2026 Data]
Get clear answers on how much radon remediation costs, including average prices, key cost factors, and tips to save money on your home’s radon mitigation.
Angi
•
Mar 18, 2026Mar 18, 2026
How Much Does Radon Testing Cost? [2026 Data]
Find out what impacts radon testing costs, including average prices for DIY kits and professional services, so you can protect your home and budget confidently.
Amy Freeman
•
Jul 9, 2026Jul 9, 2026
Who Installs Radon Mitigation Systems?
Radon is a gas that you can't see or smell and is harmful to your health. If your home has radon, you need to know who installs radon mitigation systems.
Jacqueline DeMarco
•
Jul 9, 2026Jul 9, 2026
What Is Radon and How Does It Get In Your Home?
What is radon gas? Find out what this radioactive gas is, why it is dangerous, how it gets in your home, and how to mitigate it.
Jacqueline DeMarco
•
Jul 9, 2026Jul 9, 2026
What Is Radon Testing?
What is radon testing? Radon testing measures the presence and concentration of radon gas within indoor environments. Read on to learn more.