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  • All exterior doors and windows must be kept closed 12 hours prior to, and throughout the duration of the radon test.

  • All exterior basement doors, and the basement to the first-floor doors must be kept closed, except for normal, momentary entering and exiting.

  • The radon detector cannot be moved, covered or altered in any way.

  • Heating, air conditioners, dryers, range hoods, bathroom fans and attic ventilators can be operated normally.

  • If any heating, air conditioning or ventilating equipment has a built-in outdoor air supply that is manually controlled, it is turned off or the inlet closed.

  • Fireplaces or wood-stoves are not operated, unless they are the primary source of heat.

  • Whole house fans are not operated.

  • Window fans are removed or sealed shut.

Twelve hours after these conditions are met, we will place the testing device on the lowest level (generally the basement) that will remain there for a 48-hour period, undisturbed and under the conditions outlined above. After, we will retrieve the test and its results and determine if a system needs to be installed, repaired, or altered.


We follow through with the same exact procedure above when retesting the systems performance and effectiveness, after the system has been installed.


It is recommended to retest at least every two years to see if there is any change in radon level. It is also recommended that a structure be tested any time it changes ownership.

Radon Testing

Northern Radon Solutions, LLC will gladly schedule a certified radon tester to come test your home in order to determine if the structure has an elevated radon level of 4.0 pCi/L or higher. If the level of radon is above 4.0 pCi/L, a mitigation system should be installed as per the EPA (United States Environmental Protection Agency).


Radon and radon decay product concentrations in a dwelling fluctuate from hour to hour, day to day, and season to season. There are test recommendations developed by the EPA to provide standardized conditions under which a short-term radon survey is to be performed in order to reduce the variation in radon levels in a dwelling. These conditions tend to maximize the radon measurement in order to determine if a dwelling has the “potential” to have an elevated radon level.


It is important when testing that the following conditions are strictly adhered to, in order to generate the most accurate radon level reading. If the test conditions are not adhered to, the test results may be deemed invalid.

CLOSED HOUSE CONDITIONS:

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