Larimer County · Northern Colorado
Fort Collins and the rest of Larimer County see frequent elevated radon readings. The Larimer County Health Department and CSU Extension encourage every household to test, especially during January's Radon Action Month.
3 radon professionals listed · Updated November 2026
Serves Fort Collins, Loveland, Windsor, Northern Colorado
Fort Collins radon and roofing contractor that says it has served Northern Colorado since 1973.
NRPP-certified (per company site)
Serves Fort Collins, Loveland, Windsor, Greeley, Timnath, Wellington, Johnstown, Laporte, Severance
Locally owned Fort Collins radon company that has served the area since 2013.
NRPP-certified (per company site)
Serves Fort Collins, Loveland, Longmont, Greeley, Northern Colorado
Fort Collins radon company founded in 1998 whose founder has published research on screening building sites for radon.
NRPP-certified (per company site)
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Housing in Fort Collins ranges from early 1900s homes around Old Town and the CSU campus to large newer subdivisions in southeast Fort Collins, Timnath and Wellington. Older homes often have crawlspaces or partial basements; newer homes usually have full basements.
Crawlspace homes need a sealed plastic membrane with suction underneath, which costs more than a standard basement system. Homes that combine a basement and a crawlspace may need two suction points.
Northern Colorado has a busy real estate market, and radon tests are a routine part of inspections. Sellers who mitigate before listing remove one common point of negotiation.
Yes. Larimer County homes frequently test above the EPA action level of 4.0 pCi/L. Levels vary home to home, so every home should be tested.
A standard basement system usually runs $1,200 to $2,000. Older crawlspace homes and homes with more than one foundation type often cost $2,000 to $3,000.
Larimer County Health Department and CSU Extension have offered free kits during January's Radon Action Month, and CDPHE offers free kits while supplies last at coloradoradon.info.
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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