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Radon testing

Radon Testing in Rockville, MD

A continuous monitor on the lowest level that could be used regularly, read every hour for at least 48 hours. The written result comes the day we collect it.

4.9 rating, over 4,000 reviews NRSB-certified technicians Serving Montgomery County

Schedule a radon test Call (703) 450-6398

What our customers say

From our customer reviews.

Great work! Radon test was smooth and we got our results back on the same day. Highly recommend!

They conducted the test right away and kept me informed every step of the way.

They arrived the day after I called, on time, set up the Radon test and left within 5 minutes.

Everything was handled so professionally, quickly and so easy to have our house tested for radon.

They found elevated radon in the home and numerous issues on the home inspection report which were remedied before I moved in.

How much does radon testing cost in Rockville?

A radon test in Rockville is $185, or $175 when it is added to a home inspection. That is the whole price: both visits, the monitor for the full 48 hours, and the written report with every hourly reading in it. The standard home-test price applies to a Twinbrook detached home, a planned-community townhouse or one individual Town Center residence; ask us to confirm scope and pricing for multiple units.

Day 1

Drop-off

We place the monitor

A technician places it on the lowest level that could be used regularly, following EPA placement limits and the intended use of the space, inside a two-hour arrival window. With a home inspection, placement happens during the inspection visit.

48 hours

The house stays closed

The monitor does the work

For a short-term real-estate test, EPA guidance calls for closed-building conditions for at least 12 hours before the test and throughout the measurement. Windows stay closed, exterior doors open only for normal entry and exit, and the monitor logs hourly readings that help document the test conditions during the minimum 48-hour measurement.

Day 3

Pick-up and report

We collect it, read it, and write it up

A technician picks the monitor up in another two-hour window and pulls the full record on the spot. The written report reaches you the same day.

NRSB-certified technicians. Our own team, certified by the National Radon Safety Board, not a subcontractor.

EPA testing guidance. Placement, closed-house conditions and the 48-hour minimum follow it, and your average is read against the EPA action level of 4.0 pCi/L.

Continuous monitors. Airthings Corentium Pro instruments, logging every hour for the whole test.

Appointment times are requests until our team confirms them. What the number means, how to prepare the property and the eight questions everyone asks are on the radon testing page; this page is about Rockville.

Radon testing for Rockville home sales and rentals

A Rockville radon test provides a result for the particular residence, whether it is a house, townhouse or rental unit. The City applies Montgomery County's radon testing rule to sales of covered single-family homes and townhomes; the test must be performed within one year before settlement. Give the testing team the contract deadline, full address and lowest room used or suitable for regular occupancy. A county map or another home's result cannot satisfy the need for this property's reading.

Rockville also requires testing before leasing covered ground-contact or basement rental units, with a result less than two years old at lease signing. This City period differs from Montgomery County's general three-year rental rule. For a rental or managed building, identify the exact unit and an authorized contact for monitor placement and collection. The device stays undisturbed for at least 48 hours under closed-house instructions. Confirm the applicable City requirements with its current guidance when planning a transaction.

Radon testing guidance: City of Rockville radon requirements, Montgomery County radon rules for home sales.

Sale timing

Covered Rockville home sales need a test within one year before settlement.

City rental period

Covered ground-contact rentals need a result less than two years old.

Placement and access

Identify the lowest usable room and arrange both visits.

Where we test in Rockville, and what to tell us

Twinbrook and West End
For a house, describe lower rooms planned for regular use.
Rockville Town Center
For a rental unit, confirm the exact dwelling and authorized entry.
King Farm and Fallsgrove
Share sale or lease timing and arrange pickup access.

We only perform testing, not mitigation.

We do not install radon systems, so we have nothing to gain from your number. If the result is at or above the EPA action level of 4.0 pCi/L, you choose who fixes it. Once the system is in, we can test again and tell you what it reads.

Before you book in Rockville

Rockville applies Montgomery County's pre-settlement radon testing rule to qualifying single-family home sales. The test must be performed within one year before settlement, the buyer and seller receive the result, and the County code lists property and transfer exceptions. Rockville also requires pre-lease testing for covered ground-contact or basement rental units, with a result less than two years old at lease signing. Facilities subject to an innkeeper's license are excluded from that City rental rule.

City of Rockville radon requirements; Montgomery County Code section 40-13C; Rockville Ordinance 06-23. Current as of September 2026. General information, not legal advice.

Radon testing near Rockville

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Radon testing in Rockville, answered straight

Which Rockville home sales need a radon test?

Rockville applies Montgomery County's testing rule to covered single-family and townhome sales. The test must be within one year before settlement; check City and County guidance for exclusions.

What result is needed for a covered Rockville rental?

The City requires testing for covered ground-contact or basement units before leasing, with a result less than two years old at lease signing.

Is the County's three-year rental period the same in Rockville?

No. Rockville's City rule for covered rentals uses a two-year period. Check the City guidance for the property and lease.

Where will the monitor go in a Rockville home?

Tell the technician about the lowest room used or suitable for regular occupancy. The technician selects placement under the testing protocol.

Book a radon test in Rockville

Book online or call (703) 450-6398.

Schedule a radon test Request a price

NextDay Inspect
46179 Westlake Dr, Ste 200, Sterling, VA 20165
(703) 450-6398