At what radon level do I need mitigation?

The EPA recommends mitigation at 4 pCi/L or above. The WHO recommends action at 2.7 pCi/L. Between 2 and 4 the EPA suggests considering mitigation.

How much does radon mitigation cost?

800 to 2000 dollars for a standard sub-slab depressurization system depending on your area and home type.

Should I retest before getting mitigation?

If your initial test was a short-term charcoal kit the EPA recommends a follow-up test to confirm results. A second short-term test or a long-term alpha track test provides more reliable data.

Is radon mitigation worth the cost?

Yes. Radon causes 21000 lung cancer deaths per year. At 800 to 2000 dollars mitigation is one of the most cost-effective home safety investments available.

Does mitigation affect home value?

Positively. Having a system installed removes a negotiation obstacle during future sales and shows the issue has been professionally resolved.

Do I Need Radon Mitigation? A Simple Decision Guide

You got your radon test results back. Now what? This guide helps you decide whether you need mitigation based on your specific radon level, situation, and risk factors.

The Short Answer

4 pCi/L or above: Yes. The EPA recommends mitigation at this level. You should get a quote from a certified professional.

2 to 4 pCi/L: Consider it. The EPA suggests considering action in this range. The World Health Organization recommends action at 2.7 pCi/L. If you spend significant time in the affected level of your home, mitigation is a worthwhile investment.

Below 2 pCi/L: No immediate action needed. Retest every 2 to 5 years since conditions can change.

Factors That Should Push You Toward Mitigation

You are buying or selling a home. In many states, elevated radon must be disclosed. Having mitigation done before or during the transaction removes a negotiation obstacle. In Illinois, radon disclosure is legally required for every sale.

You have children or plan to. Children are more vulnerable to radiation exposure. If kids play in the basement or sleep on the lowest level, mitigation provides an extra layer of protection.

You spend significant time in the basement or lowest level. A finished basement used as a family room, home office, or bedroom increases your exposure time — and therefore your risk.

Anyone in the household smokes or has smoked. The combination of radon and smoking dramatically increases lung cancer risk. The EPA estimates that a smoker exposed to 4 pCi/L has a 1-in-3 chance of developing lung cancer.

Your level is well above 4 pCi/L. At 8, 10, or 20+ pCi/L, the health risk is significant and mitigation should be treated as urgent.

What Mitigation Involves

Radon mitigation is straightforward. A certified contractor installs a pipe-and-fan system (sub-slab depressurization) that pulls radon from beneath your foundation and vents it above the roofline. The process takes 4–8 hours, costs $800–$2,000, and reduces radon by up to 99%. See our complete radon mitigation guide and cost breakdown.

Should You Retest First?

If your initial test was a short-term charcoal kit, the EPA recommends a follow-up test to confirm results before investing in mitigation. Radon levels fluctuate with weather and season, so a single short-term test is a snapshot — not a definitive annual average.

Options for follow-up testing: a second short-term kit for quick confirmation, a long-term alpha track test (91+ days) for your true annual average, or a continuous radon monitor (~$179, code RADONSAFETY-10OFF) for ongoing real-time tracking.

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RadonSafetyGuide.com is an independent resource. We are not a radon mitigation company.