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Professional Radon Testing

Smart Home Radon has been performing radon tests for over 15 years. We are a local company based in Gaithersburg, MD, owned by Emerson and Daisy Rezende. We serve MD, DC, and parts of NoVA. Please get in touch to learn more about Smart Home Radon.

Smart Home Radon is a sister company of Smart Home Inspects, a complete home inspection company. Hop on to our sister’s website and check all the other services we offer.

Mitigation Referrals

We have been performing radon testing for over 15 years but do not offer mitigation services to avoid conflict of interest.

We are happy to point you towards certified companies to perform mitigation services at your request.

Trusted Reports

Our tests and reports comply with national guidelines and local laws, specifically Montgomery County Law (Chapter 40 of the County Code, as amended by County Bill 31-15, on October 1, 2016).



Approved Testing Equipment

Our technicians are trained and certified by NRPP (National Radon Proficiency Program) and use professional and approved testing devices.


Efficient Property Access

As a family-owned and operated business, we strive to deliver the highest customer service and experience while performing radon testing for property transactions. We are a member of GCAAR and carry SentriLock access to make things easier for real estate agents. Hablamos Español. Falamos Português.

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Your Premier Choice for Professional Radon Testing

Smart Home Radon Testing equipment

Certified by NRPP

We hold certification with the National Radon Proficiency Program. We follow a formal code of conduct and must maintain quality control and quality assurance plans, and one of the most crucial elements, use approved devices to perform testing. Part of QA/QC includes annual calibration of all our instruments and cross-referencing devices every six months to guarantee an accurate test. Being certified also means we must keep studying to renew our certification every two years. Read below why you can trust our expertise.

Member of the Indoor Environments Association (IEA - AARST)

Hiring an IEA - AARST (Indoor Environments Association - American Association of Radon Scientists and Technologists) member gives you added peace of mind that your radon test will be done according to professional standards.

What is IEA / AARST?

IEA / AARST is a nonprofit, professional organization of members who are dedicated to the highest standard of excellence and the ethical performance of radon measurement, mitigation, and transfer of information for the benefit of members, consumers, and the public at large.

Professional and Approved Equipment

We ONLY use professional, approved and annually calibrated equipment.

All our equipment is manufactured in our state by Rad Elec, located in Frederick, MD. They developed the electret ion chambers, a technology that has changed how we measure radon in the air since 1987. By 1993, it was one of the most used and successful devices in the USA and has become primarily used internationally, reaching more than 30 countries.

Receive Report Same Day

A report will be emailed to you the same day we pick up a test, even if it is a weekend! Our reports are easy to read and understand. Resources are provided to help you make an intelligent decision on the best way to move forward. We are available via phone, email, and text message to answer any questions you may have.


We are available Monday - Friday from 9:00 AM to 5:00 PM and Saturdays from 10:00 AM to 2:00 PM.



We have in our staff a member of the National Radon Speakers Bureau available to answer your questions about radon in Air, Water, building materials, mitigation, or pretty much anything related to radon. Only highly qualified individuals get the honor to be bureau members.

We are qualified to perform radon testing in Multi-Family, commercial and large buildings.

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