Chapter 04 — The Ohio file

Radon testing & mitigation in Ohio

This site imports no Ohio state roster, so these are current NRPP and NRSB certifications from those programs’ public finders. A national certification is not a state license. We group people by the city on that file. We do not invent neighborhoods. Source: NRPP.

Latest credential check September 14, 2026. Methodology Individual record dates may be earlier.

109current listings
74testing
39mitigation
Fig. 4 — 109 of 109 current listings are mapped. Each pin is a current listing at the Census city or county centroid on the file, approximate. Pins that share a place are spread so you can click them. Not street addresses.

§ 4.1

Cities with listings

A city appears only when at least one current listing serves it.

§ 4.3

How to verify a radon credential in Ohio

OH ODH licenses radon work in Ohio but publishes no list with credential numbers that we can import, so listings here are national NRPP or NRSB certifications instead. A national certification is not the Ohio credential. Ask the agency directly: radon@odh.ohio.gov or 614-752-4425.

NRPP finder · NRSB finder · EPA guidance · All fifty states · reviewed September 8, 2026

§ 4.4

Questions about radon credentials in Ohio

Does Ohio license radon testers and mitigators?

Yes. OH ODH licenses radon work in Ohio. It publishes no current list with credential numbers that we can import, so this site cannot show the Ohio credential itself.

How do I verify a radon credential in Ohio?

Ask OH ODH directly: radon@odh.ohio.gov or 614-752-4425. The 109 listings shown here are current NRPP or NRSB certifications, which you can check on those programs' public finders, but they are not the Ohio credential.

Is an NRPP or NRSB certification enough in Ohio?

No. Ohio credentials radon work separately through OH ODH. A national certification does not satisfy that requirement. Ask any provider for their Ohio credential and verify it with the agency before you hire.