Do You Rent Out a Basement or Ground-Level Unit in Montgomery County? You may be legally required to test for Radon.
If you rent out any basement or ground-level unit in Montgomery County, Maryland - whether it’s in a single family home, townhome, or apartment - you may be legally required to disclose recent radon test results to your tenants. This includes finished basements, in-law suites, first floor apartments, and any space with direct contact with the ground.
While upper-level condos are typically exempt, most rental setups in this area do fall under the law - and most landlords don’t even realize it.
By law, you’re required to disclose radon testing results to tenants.
What Is Radon - and Why Does It Matter?
Radon is a naturally occuring, radioactive gas that seeps into homes from the ground. You can’t see, smell, or taste it - but long-term exposure is the second leading cause of lung cancer in the U.S.
Montgomery County sits in a region with above-average radon levels, and it often accumulates in basement-level spaces - especially those converted into rentals.
What the Law Says?
Under Montgomery County Code Chapter 29, landlords must:
Disclose the results of a radon test if conducted within the last 3 years
Provide this information before a lease is signed
Allow tenants to terminate the lease if they discover unsafe levels go unaddressed
| This applies to any tenant occupying a basement or ground-level space |
That means even if you’re renting to one person in your basement, you’re covered in this requirement.
How I Make It Simple
My name’s Mikala, and I run a licensed, local radon testing service right here in Silver Spring. I started this business to help homeowners and landlords like you stay safe, informed, and legally compliant - without pressure or confusion.
Here’s how it works:
Drop-Off: I set up a small, non invasive radon monitor in the unit - takes 10 minutes or less.
48-Hour Test: The device quietly collects air samples. No disruptions to you or your tenant.
Pickup & Report: I collect the monitor and send you a clear, certified report within 24 hours.
What You’ll Receive:
A NRPP-certified, MoCo-compliant report
A simplified landlord summary you can share directly with tenants
Peace of mind - for you and the people living in your home
| Want to see what a report looks like? Click here to view a sample radon report —> Sample Report |
Landlord-Friendly Pricing
I keep my rates fair and transparent:
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Our most popular service. This 48-hour radon test uses a professional continuous monitoring device to detect dangerous levels of radon gas in your home. You’ll receive an easy-to-read report within 24 hours of test pickup, with honest results you can trust - no scare tactics, just facts.
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Need results fast? This priority service includes same-day or next-day test deployment (based on availability) and expedited reporting. Perfect for real estate closings, pre-sale listings, or buyers working with a deadline. We’ll confirm exact pricing based on timing and location.
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Testing a large property or multiple foundation types? We’ll place two or more testing devices to accurately measure different areas like combination finished/unfinished basements, separate units, or areas above crawlspaces. Pricing includes a detailed report for each tested zone.
*I only offer testing - no mitigation sales or upsells*
Ready to Schedule?
I offer early morning, after-work, and weekend drop-offs to work around your schedule - and your tenants’.
Text/call: 301-691-3433
Email: MMarville@MarvillesInspectRight.com
Still Have Questions?
Feel free to reach out - I’m always happy to help explain the law or walk you through what testing looks like. Even if you’re not sure you need one yet, I’m here as a neighbor and resource.
Marville’s Inspect Right
Certified Radon Testing - Silver Spring, MD
Serving Montgomery County landlords with honesty and ease
