La Plata County · Southwest Colorado
Durango and La Plata County have a mix of historic homes, mountain properties and newer subdivisions. Radon from natural soil and rock is present across Southwest Colorado, and a test is the only way to know a home's level.
3 radon professionals listed · Updated November 2026
Serves Durango, Southwest Colorado, New Mexico
Radon company founded in 2019 with a Durango office; it also handles school and multifamily projects.
NRPP-certified and Colorado-licensed (per company site)
Serves Southwest Colorado, Four Corners
Radon testing and mitigation company serving homes and commercial properties across Southwest Colorado and the Four Corners.
NRPP-certified (per company site)
Serves Durango, Cortez, Dolores, Pagosa Springs, Telluride, Montrose, Grand Junction
Multi-state radon company with a Durango service area that also installs soil-gas collection mats in new construction.
NRPP-certified (per company site)
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Durango once had a uranium mill, which was cleaned up under a federal program. Natural radon in the soil is a separate issue and affects homes throughout the Animas Valley and surrounding areas.
Historic homes downtown and near Fort Lewis College often have crawlspaces, cellars or stone foundations. Newer homes in areas like Three Springs and along the county roads more often have basements or slabs.
Southwest Colorado has a limited number of certified radon contractors. Some serve Durango from Cortez, Pagosa Springs or farther away, so ask about travel fees and scheduling when you request quotes.
Radon is found throughout Southwest Colorado. Homes on the same street can have very different levels, so every home should be tested.
Most Durango homes cost $1,300 to $2,500. Crawlspaces, rocky lots and contractor travel can push prices higher.
CDPHE recommends retesting a mitigated home every two years, and after major renovations, to confirm the system is still working.
Colorado requires radon mitigation professionals to be licensed by the Department of Regulatory Agencies (DORA). Ask for the Colorado license number, look for NRPP or NRSB certification, get a written quote that includes a post-mitigation test, and ask about the fan warranty.
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