Radon Mitigation in Gaithersburg, MD
Gaithersburg is located in Montgomery County, Maryland — classified as EPA Radon Zone 1, the highest-risk designation. Many homes in Gaithersburg test above the EPA action level of 4 pCi/L, making radon testing and mitigation a critical step for homeowners.
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Why Gaithersburg Homes Have High Radon Levels
Montgomery County’s underlying geology — including metamorphic rock and weathered bedrock formations — creates conditions where radon can accumulate to dangerous levels. Gaithersburg homes with basements and slab-on-grade foundations sit directly on radon-producing soil. Radon enters through cracks in the foundation, gaps around pipes, sump pits, and construction joints. Professional radon testing is the only way to know your level.
According to the EPA, radon is the second leading cause of lung cancer in the United States, responsible for approximately 21,000 deaths per year.
How Radon Mitigation Works
The most effective method is sub-slab depressurization. A certified professional installs a pipe through the foundation connected to a fan that runs continuously, pulling radon from beneath the slab and venting it above the roofline. Most installations are completed in a single day. Systems reduce radon by 80% to 99%. See our radon mitigation guide.
Cost of Radon Mitigation in Gaithersburg
Typically $800 to $1,500 for a standard sub-slab system.
- Foundation type: Basement, crawl space, or slab-on-grade
- Home size: Larger homes may require multiple suction points
- Accessibility: Finished basements add complexity
See our radon mitigation cost guide.
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FAQs
Is radon common in Gaithersburg?
Yes. Montgomery County is EPA Radon Zone 1.
How much does testing cost?
$150 to $250 for professional testing.
Will a system affect resale value?
A properly installed system is a positive feature during home sales.
RadonSafetyGuide.com is an independent resource. We are not a radon mitigation company.