Radon mitigation contractors based in Delaware

We list 1 radon mitigation contractor based in Delaware so far. We only list companies found on an official license roster, and some states don't license this trade. See all 22 contractors based in Delaware, or search nearby states.

Each listing shows the board that issued its license, and the license number when the board publishes one.

Open a city or a company to check the issuing board's record.

What does it cost? National figures from public sources, with citations.

Guides Homeowner questions, with the agency sources.

Cities in Delaware

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Licensing in Delaware

Radon licensing in Delaware

Delaware does not have a state license or certification requirement for radon testing or mitigation. Delaware's Division of Public Health publishes only a voluntary list of local radon companies and says the state does not certify radon contractors. Many radon companies hold voluntary national credentials from NRPP or NRSB, so ask for proof of certification, and ask about any contractor licenses that apply to the work, such as electrical work. Check DPH's site for current information.

Delaware Division of Public Health (DPH), Radon Program (opens in a new tab)

Sources

Last reviewed November 2026. Rules change, so confirm with the agency.

Listed contractors

Showing 1–1 of 1

Rhis, INC.

Based in Wilmington, DE

Radon Mitigation
License on record. Found on the Pennsylvania Department of Environmental Protection - Radon Division roster. Last checked Oct 27, 2026.PAPA-RADON-1883Pennsylvania Department of Environmental Protection - Radon Division

License on record is from Pennsylvania, not Delaware.

Not yet claimed by the company

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