Understanding Your Radon Test Results: What Your Number Means
You just got your radon test results. Now you're wondering what that number means. Radon results come in picocuries per liter, or pCi/L. That number tells you how urgent your next move should be.
The good news is the range is simple. It breaks into three tiers, and each one comes with a clear next step. Here's a quick breakdown before we go deeper into each tier.
Under 2 pCi/L: No action needed, unless your habits change
Between 2 and 4 pCi/L: Consider a reduction system; retest in a few months
Over 4 pCi/L: Contact a mitigation specialist; retest after installation
What Does a Radon Result Under 2 pCi/L Mean?
A result below 2 pCi/L is considered low, so you're in good shape. Almost none of the homes in Denver fall in this range, so you don't need to do anything right now. Radon levels this low pose minimal health risk over time, even with daily exposure.
But there's one exception worth knowing. Say you turn a basement into a home office and start spending more time down there. Your day-to-day exposure changes when your habits change. It's worth retesting that specific space before you settle in.
What Does a Radon Result Between 2 and 4 pCi/L Mean?
This range sits in a gray zone. It's worth taking seriously even though it's below the EPA's action threshold. Consider installing a radon reduction system, especially if you spend a lot of time at home. Homes with kids, older adults, or anyone with respiratory concerns benefit most from acting early in this range.
Retest in a few months either way, since levels in this range can shift with the seasons. Temperature changes, ventilation, and how tightly your windows seal can influence the radon test results. A follow-up test can tell you whether you're trending up or holding steady.
What Does a Radon Result Over 4 pCi/L Mean?
A result above 4 pCi/L crosses the EPA's recommended action level. Reach out to a DORA-licensed radon mitigation specialist in Denver who can install a reduction system suited to your home. Most systems use a vent pipe and fan to pull radon from beneath the foundation and release it safely outside.
Installation usually takes a single day, and many homeowners see results within 24 hours. Once the system is installed, retest in a few months to confirm your levels are actually dropping. That follow-up test is important to confirm radon levels have been reduced.
The Bottom Line
Your radon number tells you what to do next. Under 2 pCi/L, relax and keep living your life. Between 2 and 4, keep an eye on it and think about radon reduction. Above 4, bring in a licensed radon mitigation specialist and retest until the number moves where it should.
Frequently Asked Questions
Is there a completely safe radon level?
No level of radon is entirely risk-free, but the EPA sets 4 pCi/L as the point where action becomes necessary. Remember that results below that number carry some small risk.
How often should I retest after mitigation?
Retest within a few months of installing a reduction system, then again every two years. Radon levels shift, so ongoing checks confirm your system is still doing its job.
Can radon levels change without any renovation?
Yes, radon levels move with the seasons and even soil moisture. That's why a single test only tells you about one moment in time.
Does a high result mean my home is unsafe to live in right now?
Not immediately, but it does mean you shouldn't wait to address it. Long-term exposure is what drives the health risk, so timely action matters more than panic.
Will a reduction system lower my results to zero?
Not usually, and that's not the goal. A well-installed system typically brings levels well below 4 pCi/L, which is enough to meet the EPA's recommendation.
