Top-rated radon detection and reduction specialists.

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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: How often should radon levels be tested to ensure safety?

• <div><p>Testing every 2-5 years or upon adjusting occupancy or structural changes maintains safe environments.</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: 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: How long does radon mitigation take?

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

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Verified Reviews for Radon Detection And Reduction pros in Hollister, CA

*The Angi rating for Radon Detection And Reduction companies in Hollister, 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 Hollister, 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 October 01, 2025

Reviewed in October 2025
I recently completed the installation of my quartz countertops, and Carlos ‘s work exceeded all expectations. The craftsmanship, attention to detail, and his professionalism were outstanding. Every seam and edge was expertly done, and the finished product is flawless. He worked efficiently,...
MAURICIO FERNANDEZ
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Reviewed in September 2025
Nasir was very professional. He came in and started immediately checking with the camera and cleaning my dryer duct. He cleaned up after himself and moved the dryer back into place as it was. I would recommend his services.
Najafzade Services
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Reviewed in May 2025
Gadiel did an excellent job grinding three tree stumps on our property and for a very reasonable price. He was honest, thorough and conscientious, and he did the job in a timely manner.
A B Tree Service
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Reviewed in April 2025
He paid attention to detail and cleaned every gutter and cleaned the roof. There wasn't any trace of leaves in the yard or the roof. I have a lot of redwood trees and the amount of leaves that needed to be cleaned was a lot. Definitely worth hiring especially if you want the whole job done.
C.U.T. Roofing Services - Unlicensed Contractor
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Reviewed in August 2024
The company is very fast and efficient. They do everything by code I would hire them again and refer them for any plumbing job
ATLANTIC O J PLUMBING INC
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Reviewed in May 2024
TJ Roofing is a family owned business that does great work. They replaced my mom's roof and it looks so nice! Everyone was always kind, punctual, and professional. They worked within our budget and were great about keeping us updated on the progress. Their prices were reasonable and the work was...
T J Roofing
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Reviewed in March 2024
On time, fast and painless, will use again
AMS Heating and Cooling
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Reviewed in March 2023
They were very knowledgeable, they put down floor protection, and very fast and efficient. Highly recommended
Air Duct Cleaning Solutions
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Reviewed in November 2022
I was very impressed with how the project was managed from the first appointment to inspect the issues, the presentation of the estimate and how the scheduling was handled to complete the work. The technician on my project was very knowledgeable and took the time to review specific functioning...
My Heating & Air
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Reviewed in April 2022
Everything about Acostaâ s plumbing is 10/10. Very professional and accurate. Plumbing now and days is expensive but Michael is very honest and knowledgeable about his work. Heâ s my go to whenever I have a plumbing issue!
Acosta's Plumbing
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Find Radon detection and reduction specialists in Hollister

MG Remediation, Inc.

3.3(

)

Radon Gas - Abatement

Serving Hollister, CA and surrounding areas

Approved

In business since 1986

Free estimates

Customers say: Quick response

"Peter and his team at MG Remediation are professionals. They did everything they told me they would do and the radon levels dropped significantly. Great communication, too, which always matters."

Response time4 days

Recommended by80%of homeowners

Radon Gas - AbatementRadon Gas - Testing

Serving Hollister, CA and surrounding areas

In business since 2000

Free estimates

Emergency services offered

"The person that came was fine. He just walked around and did the inspection. He also gave us some recommendations. The person was prompt, knowledgeable, and reasonably priced. He was very punctual."

Recommended by100%of homeowners

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A.K.I.I.

New to Angi

Radon Gas - AbatementRadon Gas - Testing

Serving Hollister, CA and surrounding areas

In business since 2003

Free estimates

K.T.W. Land Development provides local area consumers with superior quality land development and construction services. With years of experience in the industry, you can be sure your project will be handled promptly and professionally. Call K.T.W. Land Development today to schedule an appointment for your project estimate!

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Radon Detection and Reduction questions, answered by experts

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.

Testing every 2-5 years or upon adjusting occupancy or structural changes maintains safe environments.

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.

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

The Hollister, 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
•
Sep 28, 2026Sep 28, 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.
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•
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.
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•
Sep 23, 2026Sep 23, 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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•
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.