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Q: What would cause radon in a house?

• <div><p>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.</p></div>

Q: What steps should be taken if high radon levels are detected?

• <div><p>If high radon levels are detected, steps include sealing entry points, installing a mitigation system, and retesting the air regularly to ensure reduced levels.</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 are the risks of radon?

• <div><p>Radon is the number one non-smoking cause of lung cancer in the United States, but it can cause some other concerning side effects in the meantime. If you have a raspy voice, chest pains, trouble breathing, difficulty swallowing, or any of the above, don&rsquo;t hesitate to perform radon testing and install a mitigation system as soon as possible.</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 Thermalito, CA

*The Angi rating for Radon Detection And Reduction companies in Thermalito, CA 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 Thermalito, CA 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 December 30, 2025

Reviewed in December 2025
Amador and his crew were very polite and took the time to talk to me about exactly what I wanted done on my property. They were quick and thorough as well, and you can?t beat the price for the quality of work they do.
Green Touch Lawn Care
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Reviewed in September 2025
Wow! I called them and two hours later they showed up. Two hours later they were gone with the entire area clean and raked. This is how you do it! It happened so fast I never had a chance to take pictures. Great crew and chief easy to get along with. Friendly and dependable!
Affordable Junk Hauling & Moving
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Reviewed in April 2025
Mike iwas efficient and thoughtful about how he did the work. We had both power washing and concrete resealing done on patios, porch, sidewalks and driveway. Additionally he repainted the wood posts and ceiling for our back patio. All work was completed on time and within budget.
Mike Samuelsen Painting
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Reviewed in February 2024
They did a fantastic job on cutting and trimming our hedges and tree limbs! Great workers! Would use them again.
Maple Tree Care - Unlicensed Contractor
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Reviewed in September 2023
This company did an excellent job under difficult circumstances - all the trees were trimmed to perfection and the trimmings were cleaned up and chipped and placed exactly where I specified. The price was right, too. I've already recommended them to some friends and I will happily rehire them...
Kimbor Tree Service
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Reviewed in June 2023
my Ac stopped working they came out and got my Ac fixed fast and professional work Iâ m really happy with their work.
Embers Heating and Air
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Reviewed in June 2023
On time and cleaned up and they did a excellent job can't even tell that we had trees cut down
Castro Tree Service
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Reviewed in July 2022
Quick response, always on time, immaculate daily clean up. Employees, Rob &Dylon, very knowledgeable, efficient and respectful. WORK: new shower install, complete leak detection, replaced garbage disposal, kitchen faucet replacement,...Great company, we have trusted our homes to them over...
Earl's Performance Plumbing
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Reviewed in March 2022
Excellent service and very professional. Trimmed trees and removed a huge cypress bush in a timely manner. Cleaned up the area where they worked and everything was hauled away. I would definately recommend this business and will use them in the future.
Crowder Tree Specialist
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Reviewed in March 2022
I was very impressed with Roland's knowledge and concern for following code and safety. He is very detail oriented.
Certified Electric
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Find Radon detection and reduction specialists in Thermalito

Alliance Environmental Services Inc

New to Angi

Serving Thermalito, CA and surrounding areas

We take great pride in our experience, expertise, quality and customer service, that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship, and complete customer satisfaction, from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate, with every customer in a professional manner. Our reputation is based on service, safety and quality, regardless of how large, or small the job. Call us today!

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Radon Detection and Reduction questions, answered by experts

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.

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

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 the number one non-smoking cause of lung cancer in the United States, but it can cause some other concerning side effects in the meantime. If you have a raspy voice, chest pains, trouble breathing, difficulty swallowing, or any of the above, don’t hesitate to perform radon testing and install a mitigation system as soon as possible.

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

The Thermalito, CA 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
•
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.
Dan Simms
•
Apr 5, 2026Apr 5, 2026
5 Questions to Ask About Radon Gas Abatement
Radon is a radioactive gas that can enter a home from the ground. Prepare yourself for mitigation by answering these questions before hiring a pro.
Kyle Schurman
•
Apr 8, 2026Apr 8, 2026
How Long Does a Radon Mitigation System Last?
How long does a radon mitigation system last? A properly installed and maintained system can last 20 years or more, but various issues can reduce the life span.