radon retest 10

https://jeffcoradonmitigationcorner.scriblorax.com/posts/a-homeowner-s-guide-to-jeffco-radon-mitigation-what-you-need-to-know

After fixing high radon levels, a radon retest is crucial to confirm the mitigation worked. I'd place the detector in the same spot, usually the lowest lived-in level, for at least 90 days during colder months. It's a simple step to verify safety and avoid prolonged exposure to that radioactive gas.