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Radon · Illinois, Pennsylvania, Colorado

Radon mitigation: licensed contractors, prices and the rules

Every business here comes from a state radon license list, and every rule from the agency or statute that sets it. Start with your test number, then the list for your state.

151mitigation businesses on the IL and PA lists
233Colorado mitigation licenses
$895 to $3,000+published system prices, 7 businesses

Where your number sits

Fix at 4 pCi/L
EPA recommends fixing a home when the radon level is 4 pCi/L or more, which EPA writes as 150 Bq/m3.U.S. Environmental Protection Agency, read October 15, 2026
Consider fixing 2 to 4
EPA also recommends that people consider fixing their home when the level is between 2 and 4 pCi/L.U.S. Environmental Protection Agency, read October 15, 2026

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Licensed mitigators by state

Illinois

73mitigation businesses on the IEMA-OHS list 17 with a full listing EPA Zone 1: 56 of 102 counties

Pennsylvania

78mitigation businesses on the DEP directory 31 with a full listing EPA Zone 1: 49 of 67 counties

Colorado

233active mitigation licenses (DORA) EPA Zone 1: 53 of 64 counties

How mitigation works, in two rows

Vent pipe and fan system
The main fix is a vent pipe and fan that pull radon from beneath the house and send it outside.U.S. Environmental Protection Agency, read October 15, 2026
Use a qualified mitigator
EPA recommends a certified or qualified radon mitigation contractor trained to fix radon problems.U.S. Environmental Protection Agency, read October 15, 2026

Guides and tools

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