CRM Radon Testing — The Professional Standard in Ohio
Continuous Radon Monitors record your home’s radon level hour by hour, producing a time-stamped, tamper-evident data log that charcoal canisters simply can’t match. It’s the method Ohio’s licensed professionals and real estate transactions require.
A CRM samples your home’s air every hour and produces a complete time-stamped data log — not a single opaque number like a charcoal canister. That log verifies test conditions were maintained, detects any tampering or disturbance, and provides documentation that meets the standards required for real estate transactions.
How it works
Scheduling and preparation
Carl confirms the test window and explains closed-building conditions: windows and exterior doors closed for 12 hours before and throughout the test.
Device placement
The CRM is placed in the lowest livable area of your home — typically the basement — away from drafts, exterior walls, and HVAC registers per EPA protocol.
48-hour minimum monitoring
The device records radon every hour for a minimum of 48 hours. It logs any movement or disturbance — the test is tamper-evident by design.
Data retrieval and analysis
Carl retrieves the device and reviews the hour-by-hour record for test validity, confirming that closed-building conditions were maintained throughout.
Written report delivery
You receive a full written report including average radon level, the complete hourly data log, test validity confirmation, and a plain-English recommendation.
Key benefits
Tamper-evident and trustworthy
CRMs log any movement or disturbance. The data log shows definitively whether conditions changed during the test.
Hour-by-hour transparency
You can see exactly how radon fluctuated throughout the test — spikes, drops, and overall patterns — rather than a single opaque number.
Real estate compliant
CRM testing meets documentation standards required by most Ohio real estate transactions, lenders, and NRPP protocols.
Faster results
The 48-hour minimum is the shortest acceptable test window. Combined with same-day report delivery, CRM testing is the fastest path to a reliable answer.
Post-mitigation verification
CRM testing after mitigation provides verifiable proof your system is working — critical for the guarantee and real estate disclosure.
Professionally interpreted
Carl doesn’t just hand you a number — he explains what it means, what it doesn’t mean, and exactly what to do next.
Ready to get started?
Free estimates with no obligation. We respond within 24 hours.
Common questions
Is CRM testing better than a charcoal canister test?
For most purposes, yes. CRM testing provides a time-stamped data log, tamper evidence, and real-time monitoring that a charcoal canister cannot. Charcoal tests are acceptable for initial DIY screening but should not be used for real estate transactions or post-mitigation verification.
What are closed-building conditions and why do they matter?
Closed-building conditions mean keeping windows, exterior doors, and fireplace dampers closed for at least 12 hours before and throughout the test. Outdoor air dilution artificially lowers results. Carl’s CRM logs temperature and pressure changes that could indicate a window was opened.
How soon after testing do I get results?
Carl typically provides the written report the same day the device is retrieved, or within 24 hours. For real estate transactions with tight timelines, same-day delivery is often prioritized.
Can a CRM test be done in any room of my house?
Testing should always be done in the lowest livable area — the space your family uses, which presents the highest exposure risk. That’s typically the basement. Testing only on upper floors would significantly understate your exposure.
What happens if my result is between 2.0 and 4.0 pCi/L?
The EPA action level is 4.0 pCi/L, but any level above 2.0 pCi/L carries some risk. Carl discusses your result in context — how much time you spend in the basement, whether you have young children — and gives an honest recommendation rather than a one-size-fits-all answer.
CRM Radon Testing for your Ohio home?
Free estimates, honest guidance, and guaranteed results from Ohio’s trusted radon professionals.
Mon–Fri 8am–6pm · Sat 9am–2pm