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Denver, CO

Radon help for Denver homeowners

Denver sits in EPA Radon Zone 1, and Colorado's health department says about half of the state's homes are above the action level. These guides cover testing, fixing and paying for it.

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By tapping “Get my free referral,” I agree that Radon Help Network may send my request to one local radon mitigation company serving Denver, and that this one company may call and text me about my request at the mobile number I entered, including with an autodialer, prerecorded or artificial (AI-generated) voices, and automated texts. Consent is not a condition of any purchase; to get help without agreeing, use our contact form. Msg & data rates may apply; message frequency varies. Reply STOP to opt out. Privacy Policy · Terms

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Three guides for Denver homeowners

Radon mitigation

Radon Mitigation in Denver

Denver radon mitigation explained: Colorado's 2022 licensing law, how active soil depressurization works, what CDPHE says to ask for, and rules for landlords.

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Radon mitigation cost

Radon Mitigation Cost in Denver

CDPHE puts Colorado radon mitigation at about $1,300–$3,000. Denver price factors, passive-system activation costs, operating costs and the state LIRMA program.

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Radon testing

Radon Testing in Denver

Get a free radon test kit in Denver, run it the way CDPHE recommends, and read your result with Colorado's color-coded guide. Plus renter and buyer tips.

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Quick facts

Colorado

Approximately half of Colorado homes have radon above the EPA action level of 4.0 pCi/L, according to CDPHE.1

Licensing

Since July 1, 2022, anyone doing radon measurement or mitigation in Colorado must be licensed by the state.2

Free kits

Denver residents can order a free test kit from the city while supplies last, and CDPHE offers one free kit per household per year.34

Which guide do you need?

No test yet? Start with the Denver testing guide. At 4 pCi/L or higher, read the mitigation guide for how systems work and how to check a Colorado license, then the cost guide for prices and the state's low-income assistance program.

Renting in Denver?

Since August 7, 2023, Colorado landlords must give tenants a written radon disclosure before a lease is signed. Tenants may test their own units.56

Areas we serve

We match homeowners across the Denver area, including these communities and ZIP codes:

ZIP codes are 2020 Census ZIP Code Tabulation Areas, which closely approximate USPS ZIP codes. We list ZIPs that make up a substantial share of each community, so edge ZIPs that barely touch a town are left out, and some ZIPs span two towns.7 Not on the list? Send the form anyway, and we'll tell you if we can help.

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Free · no obligation · shared with one licensed pro only

The home is

By tapping “Get my free referral,” I agree that Radon Help Network may send my request to one local radon mitigation company serving Denver, and that this one company may call and text me about my request at the mobile number I entered, including with an autodialer, prerecorded or artificial (AI-generated) voices, and automated texts. Consent is not a condition of any purchase; to get help without agreeing, use our contact form. Msg & data rates may apply; message frequency varies. Reply STOP to opt out. Privacy Policy · Terms

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Other cities we cover

General information summarized from the public sources listed below. It isn't professional, medical or legal advice. A licensed professional who inspects your home can tell you what it needs.

Sources

  1. CDPHE press release, "Half of Colorado homes have elevated radon levels" (Jan. 5, 2026)
  2. Colorado Department of Regulatory Agencies, "Radon professional licensure now required in Colorado"
  3. City and County of Denver, Department of Public Health & Environment, "Radon"
  4. CDPHE, "Radon FAQ"
  5. CDPHE, "Testing and mitigating your home for radon"
  6. Colorado Division of Real Estate, "Broker Practice Advisory: SB23-206"
  7. U.S. Census Bureau, 2020 ZCTA-to-place and ZCTA-to-county-subdivision relationship files
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