Steps to Reduce Radon


Once you measure a building for radon and determine that levels are too high, there are steps that you can take to REDUCE RADON.

Health Canada has provided guidance on how quickly to act after you have received your test results, but it is up to the homeowner to make the decision for how fast they are able to reduce levels.


RADON MITIGATION is the process used to reduce radon gas concentrations in the occupied spaces of buildings in order to reduce occupants exposure to elevated levels of radon.


RADON MITIGATION can include measures which will include sealing, removing or ventilating.

  • Sealing the building foundation will attempt to prevent radon entry.
  • Removing radon from below the building to reduce the amount of radon entering the building from ground contact.
  • Ventilating the building air will provide dilution of the inside air reducing radon concentrations.
Radon Mitigation
Active Soil Depressurization

The most effective method of RADON MITIGATION is by removing radon through the use of Active Soil Depressurization(ASD).

Health Canada has released research on Active Soil Depressurization method which shows in 52 homes,
all homes were reduced to below 200 Bq/m3.

Steps to install a RADON MITIGATION System:
(Active Soil Depressurization (ASD) Method)

  1. Test for RADON.
  2. If radon levels are high, find a professional who is C-NRPP certified as a RADON MITIGATION Professional.
  3. Ask the professional…
    • For proof of past work
    • For references
    • For a plan and schedule for the work to be done
    • For proof of certification
    • To do an onsite inspection of your home
    • Whether they have liability insurance
    • What steps they do as part of the ‘Communication Testing’ or diagnostics prior to installing a full system
    • Whether they charge for diagnostic testing
    • What type of monitor will be used to ensure the radon reduction system is working continually
    • What type of testing will be conducted after the system is installed to confirm it has been effective in reducing radon levels.
  4. Contractor conducts diagnostic testing and develops a system design, installation plan, and schedule.
  5. Contractor installs RADON MITIGATION system and conducts a short term radon test to determine if it has been effective.
  6. Homeowner tests the home again with a long-term radon test during the following heating season to confirm radon levels have been lowered effectively.