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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 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: 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: What is the biggest source of radon?

• <div><p>The soil beneath your house is most likely what&rsquo;s causing an increased level of radon. This is because soil holds radioactivity for a long time and it&rsquo;s also what most buildings are built on. Another common source of radon is water from a source that hasn&rsquo;t been through periodic radon tests, such as well water. Over time, the radon from the soil can inhabit other parts of your house like the foundation or plumbing.</p></div>

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Verified Reviews for Radon Detection And Reduction pros in Mount Vernon, WA

*The Angi rating for Radon Detection And Reduction companies in Mount Vernon, WA 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 Mount Vernon, WA 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 07, 2025

Reviewed in December 2025
Daniel Johnson gave me the lowest bid of 4 different tree service companies that I contacted for estimates. So, I hired him and his crew to remove trees from my property, about 20 trees, that were leaners and otherwise dangerous. His crew was very professional and safety conscious, they worked...
Primal Tree Service, LLC
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Reviewed in August 2025
I called Bulwark to clear a wasp nest in our yard . Bailey arrived within 30 minutes and sprayed the nest. He returned the following day and removed the underground hornet nest and also removed a couple spider websites while he was there. His communication and photos were great. We really...
Bulwark Exterminating, LLC
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Reviewed in June 2025
Sawyer came over and cut and cleared dozens of trees to improve view of the ocean and got rid of them quickly.
STONE BUNNY CONSTRUCTION
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Reviewed in September 2024
I recently hired WW Property Service to help me with cleaning up my yard this fall. They really listened to my needs of pruning and yard debris removal. I had trees and shrubs pruned, lawn mowed, some weeding, and fall leaves raked up. They were hard working, courteous, and professional while...
WW Property Services
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Reviewed in February 2024
Martin House owner of High Tide services came out to my property and skillfully took down a dozen trees. We had a few close to our house that were potential hazards, and several more that needed to be thinned out. Excellent work, all done in a day. On top of the 12 removed probably another dozen...
High Tide Services
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Reviewed in November 2022
Dennis is amazing! Fast, efficient and professional. Great customer service and extremely fair pricing! Very organized team with efficient pick up and disposal service! Best part I didnâ t have to worry about anything! I will definitely hire him again for our front yard projectâ ¦
Cedar Valley Earthworks, Inc.
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Reviewed in March 2022
We have hired them twice, for trimming and pruning everything on our property, including a stand of 12 tall arborvitae, a large ground cover area, and several fast-growing evergreen trees. Their work was excellent and affordable, and they showed up on time and worked hard. We are very pleased...
Blessed Land
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Reviewed in March 2022
Chris arranged to come by and assess the problem of bats nesting in the roof peak. He and his assistant climbed up and screened the openings at both ends of the house and, so far, there have been no more bats getting into the house! Great job, and very reasonable fee.
Ohana Pest Management LLC
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Reviewed in February 2022
Miguels roofing did quality work for a fair price. I appreciated when they identified hidden water damage and made the appropriate corrections and did not just lay the new roof over the hidden problem. Thanks for the hard work and beautiful roof. Tyler
Miguel General Contractor
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Reviewed in February 2022
Great company and awesome guys to work with, they removed some tree stumps in my back yard and then leveled the entire yard, best price around for this kind of work, very professional and cleaned everything up very nice. Thanks demo dudes!
Demo Dudes Excavating & Dirt Works LLC
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Find Radon detection and reduction specialists in Mount Vernon

Edgeline Restoration

4.9(

)

Serving Mount Vernon, WA and surrounding areas

Approved

In business since 2019

Free estimates

Emergency services offered

"Great, Colby did a great job and helped me understand the whole pricess as well as the insurance side so i was fully i formed the entire time"

+23

Response time1 day

1 neighbors recently requested a quote

Recommended by100%of homeowners

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Element Environmental

New to Angi

Serving Mount Vernon, WA and surrounding areas

Approved

Free estimates

Emergency services offered

Offers commercial services

Element provides a wide range of professional services in the areas of Environmental Consulting, Water Resource Evaluation, UXO Support, and Engineering Design. Element provides the personal attention and flexible decision making capabilities of a small business while providing the breadth of expertise and experience of a large firm.

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Environmental Technology Consultants

4.9(

)

Serving Mount Vernon, WA and surrounding areas

In business since 1997

Free estimates

"Very prompt. Responded very quickly."

Recommended by100%of homeowners

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SWAT Environmental, Inc.

1.8(

)

Serving Mount Vernon, WA and surrounding areas

In business since 1988

Free estimates

Credit card accepted

"The work was fine, I haven't retested yet."

Recommended by50%of homeowners

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All Pacific Northwest, LLC

5.0(

)

Serving Mount Vernon, WA and surrounding areas

In business since 2025

Free estimates

Credit card accepted

"Esmeralda was really professional answered all the questions I had , removed popcorn ceiling from my bedrooms , would highly recommend All Pacific Northwest ?"

Response time2 days

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Radon Detection and Reduction questions, answered by experts

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.

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.

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).

The soil beneath your house is most likely what’s causing an increased level of radon. This is because soil holds radioactivity for a long time and it’s also what most buildings are built on. Another common source of radon is water from a source that hasn’t been through periodic radon tests, such as well water. Over time, the radon from the soil can inhabit other parts of your house like the foundation or plumbing.

The Mount Vernon, WA 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]
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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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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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•
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.