Inspections   Consultations  Tests

           301 467 5922




Certifications & Affiliations




Reports (Samples)

Inspection Agreement (Sample)

Request for Quotation



Home Inspections





New Houses

Historic House

Building Investigations


Infrared Scans



Environmental Consultations





Have me call you.

Environmental Consultations

Radon Short-Term Measurements (minimum 48 hours)


According to EPA, Short-Term Radon-222 testing is the quickest way to determine if a potential radon problem exists.

For Real Estate Transactions, Potomac Homes deploys a set of two short-term radon Electret Ion Chambers detecting ions produced by the decay of Radon-222, with exposure times of 48 hours or more. At the end of the tests, Potomac Homes measures the radon concentrations and sends its client a comprehensive computerized report.

Potomac Homes uses the most accurate professional E-PERM Short-Term Electret Radon Monitors, which are true integrating detectors that can measure fluctuating radon concentration regardless of extreme temperatures or humidity.

Short-term testing should be conducted in the lowest level of the home, which is currently suitable for occupancy, i.e. the lowest living area of your home, regardless if it is currently occupied or finished, with the doors and windows closed (other than normal entry and exit). Additional testing must be performed on living spaces immediately over crawl-spaces, living spaces on slabs, living spaces over garages on slabs.

Closed house conditions must be maintained for 12 hours before starting the test, unless the test is over four or more days in duration.

The best screening conditions are during the cooler months of the year, in an empty house, without any interference from seller, real estate agents or other persons and all windows, doors and ventilation must be closed, especially the rooms where the detectors are installed.

If the initial short-term test result is between 4 pCli/L and 10 pCi/L, the EPA recommends to follow-up with either:

  • a second short-term test if you need results quickly. The EPA recommends that the higher your initial short-term result, the more certain you can be that you should take a short-term rather than a long-term follow-up test. If your first short-term test result is more than twice EPA's 4 pCi/L action level, you should take a second short-term test immediately. Consider fixing your home if the average of your first test and second test is 4pCi/l or higher.


  • a long-term test for a better understanding of your year-round average radon level

If the initial short-term test result is 10 pCi/l or greater, the EPA recommends that the follow-up test be a short-term measurement in order to reduce the possibility that the occupant will be exposed to high levels while waiting the results of the second test.


The EPA recommends that you fix your home when the radon level is 4 pCi/L or more and we suggest that you contact a qualified radon reduction contractor about lowering the radon level if results of the above tests are over this threshold.


Another level set by the EPA is 2.0 pCi/L ("Consider Action Level"). At this level, the EPA recommends that you consider installing radon abatement systems in your home to reduce your indoor radon levels.

[more about radon]


[Home] [Links] [About] [Contact]

To report problems with this website, please contactTo report problems with this website, please contact

Copyright © 2005 Potomac Homes

Last modified: 03/28/2017

Professional Services: Home Inspections, Residential Inspections, New Houses Inspections, Pre Drywall Inspection, Final Inspections, Historic Houses Inspections, Building Investigations, Infrared Thermal Imaging, Maintenance Inspections, Trouble Shooting Consultations, Environmental Consultations
Infrared Thermal Imaging, Infrared Inspections, Building Thermography, Building Thermogram, Infrared Scans, Building Infrared Scan, Building Science, Building investigations. Thermography, infrared scan of electrical systems, building envelope infrared scan, energy loss infrared thermal imaging
Indoor Air Quality (IAQ):  Mold Inspections, Mold Testing, Mold Sampling, Mold Assessment, Allergens, Lead in Paint, Asbestos
Radon Tests, Electro Magnetic Fields Testing, EMF Testing, Noise Testing
Water Quality


Montgomery County, Prince George's County, Frederick County, Howard County, Anne Arundel County in Maryland

Montgomery County: Ashton, Aspen Hill, Bethesda, North Bethesda, Beallsville, Barnesville, Boyds, Cabin John, Chevy Chase, Clarksburg, Colesville, Darnestown, Derwood, Dickerson, Friendship Heights, Garrett Park, Gaithersburg, Germantown, Glenn Echo, Kensington, Montgomery Village, Olney, Potomac, North Potomac, Poolesville, Rockville, Silver Spring, Takoma Park, Wheaton

Howard County: Clarksville, Columbia, Dayton, Ellicott City, Elksridge, Glenwood, Scaggsville

Prince George’s County: Beltsville, College Park, Greenbelt, Hyattsville, Landover, Laurel, Capitol Heights, Suitland, Upper Marlboro, Waldorf

Washington DC - District of Columbia

Northern Virginia: Alexandria, Arlington, Fairfax, Falls Church, Loudoun counties. Dulles, Centreville, Chantilly, Herndon, Reston, McLean, Vienna, Rosslyn, Clarendon, Ballston, Annandale, Sterling, Great Falls, Oakton, Ashburn, Leesburg, Tysons Corner, Burke, Manassas