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Donna JohnsonLicensed

Name: Donna Johnson
Address: Harleysville, PA

Licensed radon professional based in Harleysville, Montgomery County, PA

License number	8641
License type	Radon Measurement Professional
License status	Active, PA DEP certified
Based in	Harleysville, Montgomery County, Pennsylvania

"Based in" is the city and county of the address on the business's license record. That can be a mailing address; it doesn't tell you where the business works.

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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 #8641 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Checked against PA DEP radon services directory, last checked 2026-11-02. See the issuing agency.

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