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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>

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 much electricity does a radon mitigation system use?

• <div><p>The average radon mitigation system uses about 876 kWh of electricity per year, although the exact amount of electricity used will vary depending on the size of the radon fan. Once the system is installed, the annual increase to your energy bill could range from <b>$30 to $300 per year</b>, again depending on the size of the fan.</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>

Q: How long can you go without a radon fan?

• <div><p>Your radon fan needs to operate 24/7 to be effective. The only time the fan isn't operating is during its replacement. Radon levels in the home can increase within hours if the fan stops working or something obstructs the stack vent. Fortunately, radon systems require no downtime maintenance between fan changes.</p></div>

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Verified Reviews for Radon Detection And Reduction pros in Rochester, WA

*The Angi rating for Radon Detection And Reduction companies in Rochester, 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 Rochester, 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 February 28, 2026

Reviewed in February 2026
They were quick and efficient, and we couldn't be happier with the work they did. They truly went above and beyond to ensure our leak was taken care of. They also took extra time to make sure our older roof would pass inspection. Bradley was awesome! He came out the day after I spoke with him,...
M&H Services, LLC
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Reviewed in November 2025
I have never seen a building disappear so quick! Jared and his guys had my 1200 square foot mobile home demolished and cleaned up in just 4 hours! Very courteous and professional every step of the way. I highly recommend COR Demolition to everyone I know that needs any work done, not just demo!
COR DEMOLITION LLC
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Reviewed in November 2025
They did an amazing job cutting down my tree and removing all the debris. They were very professional, great communication, and the price was great. I would hire them in the future and plan to do so.
Stephanie's Housekeeping & Landscaping
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Reviewed in August 2025
Very polite and professional and reasonable. Jon got done with the assessment and got the results back to me quickly. I will also be hiring Seattle Environmental Services for upcoming demolition work I need done. Recommend 👍
Seattle Environmental Services LLC
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Reviewed in October 2024
I bought countertops and window treatments for my business and I am thrilled. Arvids uses the highest quality products, Hunter Douglas shades and Silestone countertops in my case, and all of the guidance from Arvids to pick out the products couldn’t have gone smoother.
Arvid's Interiors and Design - Abbey Carpet
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Reviewed in September 2024
They removed and matched and blended the pieces perfectly with weathered pieces to make the repair look flawless and blend perfectly
Capital city renovation LLC
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Reviewed in March 2024
Ryan responded quickly by phone and within the week came and started the roof cleaning. Then returned the following week to finish the job. He took the leaves and moss with him but be prepared for the mess it leaves on your vehicles and gravel.
Evergreen Roof Cleaning LLC
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Reviewed in March 2023
Joel has been taking care of our property (mowing, landscaping, power washing, brush clearing, and pruning) for over a year now. We couldnâ t be more pleased with his quality of work, professionalism, and reasonable rates. We highly recommend his services and will continue to use them ourselves.
Alfa WA, LLC
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Reviewed in June 2022
I should have done a before and after photo. Abrego Landscaping did a beautiful job on our front yard. I had them put down new bark, mow, weeding, trim bushes and small trees. I decided to have them do our lawns twice a month for this summer. Thank you, Pablo and Kathy
Abrego Landscaping, LLC
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Reviewed in March 2022
Outstanding company. I had a tall tree that I wanted removed. My Observations: 2 very polite workmen, asked to see the job and explained that: Yup, we can remove the tree, of course I can lay the fallen tree to miss the fence...the tree missed the fence. Very hard job of moving the cut up...
West Coast Fence Pros, LLC
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Find Radon detection and reduction specialists in Rochester

Serving Rochester, WA and surrounding areas

Approved

In business since 2019

Free estimates

Small jobs welcome

"Pascal was very prompt in communication and coordinating the testing. The results were provided next day and he answered all my questions. I recommend 5 Microns Inc and will use their services in the future."

+32

Response time3 hrs

Response rate98%

Recommended by100%of homeowners

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Environmental Technology Consultants

4.9(

)

Radon Gas - Testing

Serving Rochester, WA and surrounding areas

In business since 1997

Free estimates

"They were very honest & told us we didn't have black mold and needed a dehumidifier. I would very certainly recommend them for their honesty"

Recommended by100%of homeowners

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SWAT Environmental, Inc.

1.8(

)

Radon Gas - Abatement

Serving Rochester, WA and surrounding areas

In business since 1988

Free estimates

Credit card accepted

SWAT Environmental is the nation's largest radon abatement engineer. Our experienced staff has corrected radon problems for over 60,000 customers since 1988 with 100% success!

Recommended by50%of homeowners

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American Building Solution LLC

New to Angi

Radon Gas - AbatementRadon Gas - Testing

Serving Rochester, WA and surrounding areas

In business since 2014

Free estimates

Emergency services offered

Professional handyman services as well as Residential and Commercial property maintenance.\n\nWe specialize in room additions and full home remodels along with residential and commercial property electrical, plumbing, carpentry, and interior and exterior tenant improvements, re-keying, painting, landscaping, and all other property maintenance and construction services.\n\nProperty managers: we specialize in local handyman work and property maintenance needs.\n\nhttp://www.handymanintacoma.com/

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Radon Detection and Reduction questions, answered by experts

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.

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.

The average radon mitigation system uses about 876 kWh of electricity per year, although the exact amount of electricity used will vary depending on the size of the radon fan. Once the system is installed, the annual increase to your energy bill could range from $30 to $300 per year, again depending on the size of the fan.

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

Your radon fan needs to operate 24/7 to be effective. The only time the fan isn't operating is during its replacement. Radon levels in the home can increase within hours if the fan stops working or something obstructs the stack vent. Fortunately, radon systems require no downtime maintenance between fan changes.

The Rochester, 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
•
Aug 3, 2026Aug 3, 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.
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.