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Douglas GreenwoodLicensed

Licensed radon professional based in Warrenville, DuPage County, IL

Company	DuPage Radon Testing
License number	RNIT2014225
License type	Radon Measurement Technician
License status	Active, IEMA-OHS licensed
Based in	Warrenville, DuPage County, Illinois

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How to verify this license

We publish the license details exactly as they appear in the official licensing records of the agency that issued the license; we do not vouch for the business itself. Before hiring, look up license #RNIT2014225 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Checked against IEMA-OHS radon license index, last checked 2026-11-02. See the issuing agency.

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