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Radon testing and mitigation in Douglas County, CO

42 certified radon testers and mitigation contractors in Douglas County, CO. Mitigation contractors are listed first.

42 certified prosUpdated October 2026Source: state certification lists and the NRPP directory

Pros in this state come from the NRPP national certification directory (checked Oct 28, 2026). Get Radon Quotes is independent and not affiliated with NRPP. Some states also require a state license, so confirm with your state radon office before you hire. Your state radon office.

Cities in Douglas County:Castle RockParkerHighlands Ranch

42 certified pros near Douglas County, CO

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Radon guides

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Common questions

Who installs radon systems near Douglas County, CO?

The certified mitigation contractors listed above serve Douglas County, CO and the surrounding county. Get two or three quotes.

How much does radon mitigation cost near Douglas County, CO?

Typical residential systems cost in the high hundreds to low thousands of dollars depending on the foundation and how the pipe is routed. See our mitigation cost guide.