Radon Mitigation in Fort Collins, CO: Larimer County's Radon Problem

Larimer County's Radon Risk

Fort Collins and Larimer County are part of the Colorado Front Range radon corridor — a strip of high-radon risk extending from Pueblo in the south through Colorado Springs, Denver, Boulder, and Fort Collins to the Wyoming border. All of these areas share the same underlying geology: granitic and metamorphic Precambrian basement rock with exceptionally high uranium content.

Radon generated in this basement rock migrates through overlying glacial and alluvial sediments and concentrates beneath home foundations. The Front Range communities consistently show indoor radon levels at or above the 4.0 pCi/L action level in a significant fraction of homes.

CSU Campus and Student Housing

Fort Collins's large student population and student housing market creates a specific radon concern: renters and students rarely test for radon, and landlords of older properties may not have maintained existing mitigation systems.

If you're renting in Fort Collins — particularly in older neighborhoods near the university — request radon test results from your landlord. Colorado law allows tenants to test, and landlords of dwellings with known elevated radon have disclosure obligations.

Homes West of I-25

The communities west of Fort Collins toward the foothills (Bellvue, Laporte, Red Feather Lakes area) sit even closer to the granitic bedrock and have historically higher radon readings. Rocky sub-slab conditions in foothills properties may require multiple suction points and a higher-suction fan. Get a thorough site assessment for any foothills property.

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