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Q: How long does radon mitigation take?

• <div><p>Installation typically takes 1-2 days, depending on the system and property layout.</p></div>

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: What level of radon is considered safe or dangerous?

• <div><p>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.</p></div>

Q: Can I perform radon gas abatement myself?

• <div><p>While DIY testing is possible, abatement generally requires professional installation to ensure efficacy and meet safety standards.</p></div>

Q: How is radon gas abatement professionally handled?

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

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

*The Angi rating for Radon Detection And Reduction companies in California, 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 California, 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 April 27, 2026

Reviewed in April 2026
Ed was excellent to work with. He was very conscientious and respectful and his work is excellent. Ed put up drywall in 2 rooms and then painted everything to match. We are very pleased with the entire project and we enjoyed meeting Ed. The whole thing started as a surprise flood in my 87...
Frye Family Painting and Drywall Repair
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Reviewed in October 2025
Leroy and crew very professional and knowledgeable. Did a great job on my mobile home roof over. Took there time to make sure everything was lined up installed correctly before they mwould make it permanent. Would hire them again in a minute. Would recommend them to anybody.
Eagle Eye Construction
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Reviewed in October 2025
They did an excellent job. I had two trees near my house that they took down. One was very large and starting to split down the middle only ten feet away from the house.
Show Me Tree & Turf
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Reviewed in June 2024
The owner Daniel is very respectful came to my home gave me a great price and got my drive way and home power washed and looking brand new.
Supreme power washing L.L.C
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Reviewed in May 2024
Hayden is a great guy to work with. Very professional, timely, and trustworthy. Prompt service and hardworking. He can out when he said he would and gave me an estimate, Took a deposit and ordered the materials. Once they came in(took about 3 days) he scheduled when to come out with me. He...
Yoakum construction LLC
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Reviewed in April 2024
I hired them to clean my outbuilding and driveway in the same day and they were able to get both done and look great! For once you get the triangle of good, fast, and decent without having to pick two!
Pure Exterior LLC
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Reviewed in February 2024
Jordan and his assistant did a very good job at every step of the process. Were punctual and cleaned up well. Did all removal, installation and also did a very good job on the trim.
Reimer Renovations
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Reviewed in April 2023
He was prompt and he did outstanding work because he was very conscientious, he did inside rehab on my home and did outside work on my deck, he also put a patio in, pretty good quality.
Cutt's Construction Services
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Reviewed in April 2022
I called Gallegos Exteriors and they came out the same day to measure and give us a quote. We signed the contract on a Thursday. The next day the shingles were delivered and the work was done on Monday. They completely removed the old roof, checked for any damage (there was none) and put on the...
Missouri Metal Roofing, LLC
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Reviewed in February 2022
What they did for me was to raise and level my floors and install a floor joist where there had never been one. My home is 114 years old and has been neglected. After the initial work was done, I wasn't "happy" and had questions about how and why things were done, within 24 hours...
Foundation Recovery Systems
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Find Radon detection and reduction specialists in California

Full Scope Home Inspections

5.0(

)

Serving California, MO and surrounding areas

Approved

In business since 2014

Free estimates

Credit card accepted

"Randall went above and beyond what I thought would be done for a home inspection, was willing to crawl into small spaces. He did a very thorough job, and his report was very detailed, and that's why we appreciate his work."

Response time3 hrs

Response rate93%

Recommended by100%of homeowners

Serving California, MO and surrounding areas

In business since 2020

Free estimates

Credit card accepted

"Great value, very fair price."

Response time3 days

Recommended by100%of homeowners

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Braun's Inspection Consultants

4.7(

)

Serving California, MO and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"James performed the inspection like a real professional."

Recommended by100%of homeowners

Serving California, MO and surrounding areas

In business since 2005

Free estimates

Mid MO Inspectors will provide you or your business with a full service approach to all your inspection needs. Please feel confident in contacting Mid MO Inspectors for your next inspection.

Recommended by100%of homeowners

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Brandsted Property Preservation

New to Angi

Serving California, MO and surrounding areas

In business since 2011

Free estimates

With over 10 years of experience in the home inspection industry, we are the experts you need to take care of your home. We will treat your home as we would treat our own. Give Brandsted Home Inspections a call today. We look forward to working with you.

Response time10 mins

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Radon Detection and Reduction questions, answered by experts

Installation typically takes 1-2 days, depending on the system and property layout.

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.

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.

While DIY testing is possible, abatement generally requires professional installation to ensure efficacy and meet safety standards.

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

The California, 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

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.
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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.
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•
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.
Kyle Schurman
•
May 21, 2026May 21, 2026
How Does a Radon Mitigation System Work? And How Do You Keep Yourself Safe?
How does a radon mitigation system work? Learn more about how it pulls air and radon from the soil and expels it before it can enter your house.
Kate Fann
•
Apr 9, 2026Apr 9, 2026
Radon Mitigation System Diagram: Understanding How It Works
You need to protect your home from radon, but what does a radon mitigation system look like? Check out this radon mitigation system diagram to learn how it works.
Amy Freeman
•
Apr 5, 2026Apr 5, 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.