Do I Need a Licensed Radon Testing Contractor in Ohio? What Dublin Homeowners Should Know in 2026
Ohio requires any professional performing radon testing for compensation to hold an active ODH license. Here is what Dublin, OH, homeowners need to know in 2026 before hiring anyone to test their home for radon.
Radon is an invisible, odorless radioactive gas that can accumulate indoors to dangerous levels. Hiring the right radon testing contractor in Dublin, OH, means understanding Ohio's licensing rules, what national certifications like NRPP and NRSB actually mean, and why the Franklin County area carries a particularly elevated risk.
Ohio's ODH Licensing Rule: What It Means for Dublin Homeowners
Ohio law is clear. All radon companies and personnel involved with testing and installation of radon reduction systems must be licensed through the Ohio Department of Health. The ODH Radon Licensing Program covers contractors, specialists who design and supervise installation of systems, radon testers, radon laboratories, and radon training providers.
Separate certification by NRPP and/or NRSB is not a requirement for obtaining an ODH license, nor is it a substitute for one. To provide radon-related services in Ohio, you must be specifically licensed by ODH.
Ohio law permits homeowners to test their own property. Anyone else performing the test must hold an active ODH license. This matters if you are a buyer, seller, or renter relying on a third party. An unlicensed tester's results may not be accepted by lenders, real estate agents, or the Ohio Department of Health.
What Is the Difference Between NRPP and NRSB Certification?
NRPP and NRSB are both legitimate national radon certification programs covering measurement, mitigation, or both. NRPP is recognized by the EPA and accredited by the ANSI National Accreditation Board under ANSI/ISO/IEC 17024. NRSB certification recognizes professional excellence based on qualifications, ethical standards, and continuing education in radon services.
In Ohio, neither credential replaces the ODH license. Think of NRPP or NRSB as a sign of professional commitment above the state minimum. If certified, a professional must still meet state requirements and must follow whichever standard is more strict when no conflict exists. For Dublin homeowners, the safest approach is to confirm both: an active ODH license and a national credential where available.
Why Franklin County Radon Risk Makes Testing Especially Important in Dublin
Franklin County, which includes Dublin, Hilliard, Worthington, and Upper Arlington, carries some of the highest measured radon levels in Ohio. Franklin County is in US EPA Radon Zone 1, designated for counties with predicted average indoor radon screening levels greater than 4 pCi/L.
Since the ODH radon program began, 112,486 radon tests have been conducted in Franklin County. The average indoor radon level is 7.47 pCi/L, which exceeds the EPA action level. The EPA recommends fixing your home if your radon level is 4 pCi/L or higher, and suggests considering mitigation between 2 and 4 pCi/L.
It is impossible to know the radon level in a building without testing. There is no substitute for an actual test conducted by a qualified radon testing contractor.
Does Ohio Require Radon Testing When Selling a Home?
Ohio law does not require owners to test or mitigate before sale. However, sellers must disclose on the Residential Property Disclosure Form any previous or current presence of radon. For Dublin buyers and sellers, testing before listing or before closing is strongly advisable even when not legally required. A licensed radon testing contractor provides results that hold up during real estate negotiations.
Can I Use a DIY Radon Kit Instead of Hiring a Contractor?
Ohio permits homeowners to test their own property, but DIY charcoal canister kits have important limitations. Results from a DIY kit are generally not accepted in a real estate transaction, and placement errors or closed-house protocol violations can affect accuracy. Licensed contractors use calibrated Continuous Radon Monitors (CRMs) that provide real-time data, tamper resistance, and environmental condition tracking, producing results that buyers, sellers, and lenders can rely on.
How Do I Verify a Contractor's ODH License?
The Ohio Department of Health maintains a searchable database of licensed radon professionals. Before scheduling any test, ask the contractor for their ODH license number and verify it through the ODH Radon Education and Licensing Program. You can also confirm active NRPP or NRSB certification through each program's online directory. Checking both databases takes only a few minutes and protects you from unlicensed operators.
What Does a Licensed Radon Testing Contractor Actually Do?
A licensed radon testing contractor places approved measurement devices in the lowest livable area of your home, typically the basement or first floor, following strict ODH placement and closed-house protocols. Services may include short-term (48-hour) and long-term (up to 90-day) radon tests using continuous electronic monitors. After testing, you receive a written report with measured levels and, if needed, guidance on next steps.
Ready to Schedule a Radon Test Serving Dublin, OH?
A licensed radon testing contractor serving Dublin, OH, can give you accurate, credentialed results that hold up in any context, from routine peace of mind to a real estate closing. ProCheck Engineering, Inc. has served Central Ohio homeowners and buyers since 1997, providing ODH-compliant radon testing with professional-grade equipment. Call (614) 841-0217 or contact the team online to schedule your test. You can also learn more about radon testing services for Dublin, OH, or confirm credentials at ProCheck Engineering, Inc. on Google. Do not wait to find out what is in your air.
