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Willem KleynhansLicensed

Licensed radon professional based in Castle Rock, Douglas County, CO

License number	RMT 122
License type	Radon Measurement Professional
License status	Active, Colorado DORA licensed
License expires	May 31, 2027
Based in	Castle Rock, Douglas County, Colorado 80108

"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 #RMT 122 directly with the agency that issued it, confirm it is still active, and ask for a current certificate of insurance.

Checked against Colorado DORA radon license file, last checked 2026-11-02. See the issuing agency.

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