What is Radon Testing?

Radon Gas Testing Methods:

There are two basic types of radon gas testing devices, passive and active. You can order a radon test kit and set it up yourself or you can hire a professional to perform the test.

Passive Radon Gas Testing Devices

  • Do not need power to function.
  • Include charcoal canisters, alpha-track detectors, and charcoal liquid scintillation devices that are exposed to the air in your home for a specific amount of time and are then sent to a laboratory for analysis.

Active Radon Gas Testing Devices

  • Require power to function.
  • Continuously measure and record radon in the air, making radon spikes and dips more apparent.
  • Include continuous working level monitors and continuous radon monitors.
  • May include anti-interference features that reveal if the unit is moved during testing.
  • Generally considered to be more reliable than passive radon devices.

How long should you test for radon gas?

Long-term radon tests take more than 90 days but provide an accurate picture of the average amount of radon in your home. Since time is an issue, home buyers usually perform short-term radon with either an active or passive testing device.

Most short-term radon tests are completed in 48 to 96 hours.

How To Test for Radon​

The EPA recommends that you perform radon tests on the lowest level of the home that could be used for living space without doing renovations.

  • Choose a room that is used regularly, but do not use the kitchen, bathroom, laundry room or a hallway.
  • Sometimes two devices are used simultaneously or two 48-hour tests are done back-to-back to help establish average radon levels and to verify that devices are working properly.
  • Keep windows and doors in the tested room shut except for normal entry and exit. For tests lasting less than four days, make sure windows and outside doors are closed for at least 12 hours before beginning.
  • Do not do short-term radon tests during times of high humidity, severe storms, or when winds are high.
  • Place the testing device at least 20 inches above the floor so that it is out of drafts and high humidity and will not be disturbed.
  • Follow the manufacturer’s instructions to record starting and ending times. Reseal the tester package and return it to the lab for analysis.

If Radon Levels Are Too High

About 0.4 pCi/L of radon is found in the outside air and the average indoor radon level is about 1.3 pCi/L. The EPA recommends you use mitigation techniques to reduce indoor radon if levels in your home are above 4 pCi/L/.

Radon levels can usually be lowered using a process called mitigation, a term that means to moderate something or make it less severe. Some radon mitigation methods prevent radon from entering your home and others reduce radon levels after the gas is there.

D Radon Mitigation & Plumbing

Mitigation Lic # RNM2015206

Plumbing Lic. #055-044334


  • Data herein is for information purposes and outside sources have been utilized. 
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