How Often Should You Retest for Radon?

We recommend retesting for radon every 2 years if mitigation/remediation was performed, or every 2–5 years if it was not.

This isn't just a precaution for its own sake — radon levels can genuinely change over time, even in a home that tested clean previously.

Why Radon Levels Can Change

A few things can shift radon levels between tests:

• Settling or new cracks in a foundation

• Renovations that alter airflow or seal up previously ventilated areas

• Changes to a home's HVAC system

• Shifts in surrounding soil conditions

None of these are things you'd necessarily notice day to day, which is exactly why periodic retesting — rather than a one-time test — is the more reliable long-term approach.

Retesting After Mitigation

If you've had a mitigation system installed, retesting on a 2-year cycle also confirms the system is still functioning as intended.

Mitigation systems are generally reliable, but like any mechanical system, verifying it's still doing its job periodically is a reasonable, low-cost check.

Choosing the Right Retesting Schedule

If you've never had elevated levels and haven't done any major renovations, the longer end of that window (up to 5 years) is a reasonable cadence.

If you've renovated significantly, added a room, finished a basement, or simply want more frequent peace of mind, testing closer to every 2 years is a reasonable choice even without mitigation in place.

Schedule a radon or mold test today with DezAir Quality Testing online at dezairqualitytesting.com.