Comparison
Short-Term vs Long-Term Radon Testing
Both EPA-approved radon testing methods have legitimate uses. Choosing the right one depends on whether you’re closing on a real-estate transaction, planning mitigation, or doing routine homeowner monitoring.
Short-Term vs Long-Term Radon Testing
Both EPA-approved radon testing methods have legitimate uses. Choosing the right one depends on whether you’re closing on a real-estate transaction, planning mitigation, or doing routine homeowner monitoring.
| Feature | Short-Term (48-hour) Real-estate-ready, fast, screening | Long-Term (90-day+) Most accurate, best for long-term decisions |
|---|---|---|
| Duration | 48 hours minimum | 90 days to 1 year |
| Cost | $150-$300 | $200-$400 |
| Accuracy | Snapshot. Varies with weather and season | True annual average |
| Real-estate use | Standard for closings | Not used for closings |
| Best for | Closings, screening, post-mitigation verification | Annual exposure assessment |
| EPA stance | Acceptable for closing | Recommended for accurate exposure |
Our recommendation
If you’re under contract or just had high readings, start with a short-term test. For ongoing monitoring or borderline initial readings (2.0-4.0 pCi/L), follow up with a long-term test for the most accurate picture.
Ready to get started in Cincinnati?
We connect Greater Cincinnati homeowners with NRPP-credentialed radon mitigators in our partner network. Mon-Sat 8am-7pm.